Brake Buddy Stealth Supplemental Braking System - Proportional

I am a proficient DIYer (and was an auto mechanic many years ago). The installation took a lot of time - perhaps 8-10 hours for the brake controller. The most special tool needed was a rotary cutter (e.g., a Dremel tool). A cordless impact driver was also very helpful, especially with the self tapping screws.

Getting the pully in the perfect position under the brake pedal took some trial-and-error to get perfect. Also, the included bolts for the brake pedal bracket where too short to accommodate the width of the brake lever - easily remedied with slightly longer standard bolts. Be very mindful of what is on the other side of the sheet metal you are planning to drill into.

The brake supplemental vacuum system was a bit of a challenge, as the instructions are very vague regarding how to mount, and the space I had to work with was surprisingly tight. I ended up creating a mount on the inside front fender, and bolting the pump to that. Also, tapping into the vacuum lines took a couple of tries to get a leak-free connection. Think ahead about this, and be prepared to get a few small parts like hose clamps or right-angle hose connectors. This would be a potential consideration for any vacuum boost added on any vacuum power-assist application with any controller.

I mounted the Brakebuddy main unit under the rear seat - that was a perfect location, and much better than the often suggested location under the driver's seat. I was very pleased with the installation result.

I paired this with a Nighthawk tow bar. Be warned that the tow bar's included cable will not be compatible with the Stealth, as the Brakebuddy uses a proprietary connection at the towed vehicle. The upside of this proprietary connector is that all connections are build in, including the brake away cable and the battery charging line.

(I modified the Nighthawk by replacing the included cable with a 4-pin cable to power the lighting system on the bar. This is just for extra safety and cool looks - I could have just not used the tow bar's included cable).

With 1,200 miles of towing behind us, I can say I am very pleased with the performance. I rarely notice any difference in braking effort or effectiveness - which is a big advantage for a proportional system. My favorite feature is the ease and speed of connecting or disconnecting the towed vehicle.

I'd give this a 4.5 stars out of five if I could, because I did need to add a few parts and make a couple trips to the hardware store to complete the installation. However, the excellent performance and ease of use once installed more than makes up for the inconvenience during initial installation.

Special appreciation to the people at eTrailer, especially Nicole T, who provided support and guidance from pre-sales to installation. Also, I called Brakebuddy's support line with a concern, and they immediately picked up the line, addressed my question, and offered to immediately ship any parts if needed.1285984

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Sam J.

4/15/2023

Using this set up could not be easier. The only maintenance needed is keeping the connectors clean and refreshing the terminal grease. Operating is true plug and play though I always test the setup before driving off in tow. We did have a suspected issue with the original cable between the RV and vehicle I contacted support and they said it might be a bad connector or might just need to be cleaned. But well send you a cable just in case. I couldnt be happy with their response. It has worked since. I do wish the vacuum booster pump included with a kit drew more vacuum. It does indeed charge the brake booster, although I suspect not quite at the same high levels as the vehicle does one operating normally. I am certain the brakes are being applied with the booster, and the breaking effort seems balanced between the RV and the vehicle towed. I contacted engineering through customer support about this as well, they assured me that the design pressure was to specifications.

I choose the Brake Buddy Stealth for my 2021 Jeep Wrangler because I wanted a “stay in place” brake system and felt it would be a clean looking installation. I finished the toad side of the installation today and thought I’d leave some notes on what turned out to be a bigger project than I’d anticipated. Again, this is my experience on the 2021 Jeep Wrangler 2-door. Your experience on other vehicles may vary.

I started this install after installing a Demco Tabless Base Plate. Right out of the blocks, there’s really no convenient location to mount the cable connector to the Demco baseplate. I chose to mount it to under side of the bumper on the driver’s side. To provide clearance and a route for the wires, I had to cut a notch into the plastic air dam. I used one of the already screw screw holes and used self tapping screws in the other three locations. For added strength I epoxied the connector to the bumper as well. Since the bumper would be unremovable if the connector were hardwired, I added a waterproof connector. The kit is stingy with wire lengths, so I substituted my own wire.

The Stealth unit itself i mounted beneath the driver’s seat. Don’t be fooled into believing there is clearance when testing with the driver’s seat positioned for rear seat access. Once the seat is returned to normal operation it lowers a bit and the box keeps the seat from being move forehand aft. I solved the problem by installing 5/8” thick nylon washers under the rear end of the seat slides. I also cut away a bit of the carpet under the front, inboard corner of the box. You will need to remove the driver’s seat in order to attach the front screws of the box. Be sure to disconnect and isolate the neutral battery terminals to prevent inadvertent air bag discharge. After removing the interior trim from the A-pillar, the door sill, and the driver side foot well, The wiring and cable tucked nicely away along with the OEM wiring and wiring for my taillights. I mounted the pulley horizontally behind the brake pedal.

Installing the vacuum pump was my biggest worry and challenge. Instructions are to zip tie it “somewhere”. That seemed pretty casual for a safety system. I chose, instead, to fabricate an aluminum bracket that attaches to the lip of the engine compartment and to the wheel well (this latter attachment point is necessary to keep the pump from vibrating).

Finally, the kit comes with 3/8” fittings to tap into the brake booster vacuum lines. The Jeep, however, uses 8mm nylon tubing. Brake Buddy, via etrailer.com, stated that the tubing would stretch and all would be good. Again, this felt casual for a safety system. Instead, I purchased an 8mm check valve and a 8-6-8mm barbed tee through Another online retailer to do the job right. I had to heat the Jeep tubing to fit even the 8mm tee, so the is no way the larger 3/8” fittings would have worked. See photo of my finished vacuum line installation.

Bottom line, it was a POA install, but looks great. Hopefully it will stop the Jeep when towing. I’ll find out soon. :D941920

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Jerry J.

1/24/2022

The Brake Buddy performed fine on all of our trips in 2021, including some mountainness terrain. We learned early, however, that the Stealth unit installed in the Jeep is temperature sensitive. On chill morn8ngs we need to start and run the Jeep with the heater at full blast for 5-10 minutes before setting out. Otherwise we get false breakaway signals in the cab controller. The connector on the Jeep side is also touchy resulting in turn signal failure notices on our motorhome dash. The manufacturer hasn’t been very sympathetic nor helpful with either issue. In short, we are able to use the system, I’d not recommend this product today.

Tom M.

8/3/2022

Finally stable. The vehicle side connector is difficult to mount and quickly got corroded. The built-in trailer breakaway function did not fail but the wire that is used to send the signal to activate the brakes was very flakey. It caused several false breakaway signals in the RV. I also had trouble with the wire from the front of the RV but the vehicle mounted connector was the main problem. Eventually I moved the breakaway wire to the closed contacts of a relay and added a conventional breakaway switch. The relay is necessary because the supplemental brake system senses a breakaway when a circuit gets opened and the conventional switch makes a connection. Mounting the pulley under the brake pedal was a pain but no more so than with a different system I installed in a different car. Now that it is working I think it is a good system but if I do it again it will be a system that doesnt depend on a signal from the RV. A more serious hassle is the brake actuator cable. Make sure you mount the actuator box on a position that allows for the absolute straightest and shortest run of actuator cable. The longer it is, the straighter it has to be. Tech support was really awesome! This system is more sophisticated than others I have considered but that sophistication makes it harder to have a reliable system.

by: Tim 04/03/2024

Installation was straightforward. It works great and does not drain battery since it has built in charging. This was an important aspect I was looking for in an installed system. Be sure to keep dielectric grease on connector so it does not inadvertently engage brake. Over 10,000 miles of flat towing with no problems.1758469

by: Gary02/19/2024

The Brake Buddy has been working great. I just wish they had made the plug a more standard mount. It doesn't fit the standard mount point on my Roadmaster baseplate. I had to make a little bracket to adapt it.1734270

by: Justin 01/14/2024

Excellent non-obstrusive system. It is a fairly involved installation (took me a few evenings), but after is hands-off and very quick hook-up.

My one worry is the proprietary flat connector used for the electrical hookup at the front of vehicle. I've had a couple of times where the pins on the vehicle side have compressed enough to not make a full connection, including one time that triggered the emergency breakaway system. I've cleaned and tweaked it, and it's been stable the last few months. But I worry what happens if it has an issue and leaves us without a good connection and nowhere to get a replacement.

Even with that I would highly recommend this for someone looking for a hands-off braking system.1711319

by: James12/16/2023

2019 Ford Ranger

My brake buddy started applying itself, when not being towed. Leaving me in dangerous positions and holding up traffic. Contacting E trailer gave info contact information. However the company could not provide any trouble shooting information. There only help was telling me to pull fuse so that it would'nt activate. I had allready disconnected the cable at the brake pedal.1703111

Installation in 2014 2-door Jeep Wrangler JK with manual transmission

The seat in my Jeep is very different from the pictures in installation videos. There is absolutely no way the main unit can go under the seat 'crosswise'. Additionally the heavy cross bar at the rar of the seat doesn't allow the unit to be positioned fore-aft without a bit of additional work.

I found that installing oriented for-aft running the cable under the carpet gently curving to the left and turning back to the pulley worked pretty well. It's using up some foot space for rear seat passengers, but we very rarely carry passengers so it works for us. There is a fairly large 'hump' in the floor under the unit. I screwed down the rear most tabs with some rubber washers underneath, and then used the longer self-tapping screws in the kit to attach the front tabs without creating any stress in the unit.. just a little snug does the job.

For most of the screws I used 3/4", the included 1" are much longer than necessary. Likely could have used 1/2" in most places.

So far it seems to work pretty well. I dropped a start mostly due to the documentation being a bit vague and poorly worded.

For example regarding testing when disconnected from the motorhome, the instructions seem to imply that you connect and then disconnect the dummy plug and it should apply brakes. When I tried that the unit indicates breakway (flashing green light), but did NOT apply brakes. After some fiddling around, I found that I needed to have the dummy plug installed, connect fuse (or disconnect for a few seconds and reconnect fuse) and THEN within 3 minutes pull the dummy plug. That's very different from the manual which states "may be tested by attachinga and removing the dust cap".

Installation manual specifies installing the pulley with the cable connection pointing down without any mention of other options. This is a bit disconcerting, videos of Jeep installs seem to always run the cable in from the left side. How is the end user to know if that's okay? Maybe it was okay when the videos were made, or the videos are wrong..etc. A brief mention that in cases where the cable can't be routed below the pulley, running it through the side/top..etc. is okay.

Lastly various areas of the documentation say to call, they are open 8AM - 5PM CST. I only found ONE mention that they are open Monday-Friday... it's a simple detail that should have been caught a long time ago. I expect technical documentation to be accurate.1401895

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The order was filled over a weekend when I ordered it and showed up before it's scheduled time. Everything was as I expected it after talking to ETrailer support before ordering. Thanks ETrailer another great experience.1684158

John

10/30/2023

I have this system installed. It was fairly easy install. I had an issue with controller installed in my Motorhome it did not work properly but contacted manufacturer Hopkins support and they immediately sent new unit and it worked great.

Mike L.

11/15/2023

@John We're glad to hear that Hopkins took good care of you!

by: Vincent04/02/2024

Install was not that difficult. But I could never get it to work properly. The idea of the inertia sensing being on the sending unit in the coach was an issue. It was never able to be adjusted correctly. I could go for hundreds of miles without an issue but then when entering an on ramp or exiting a ramp the brakes on the car would lock and disengage then lock again. I would have to go five MPH for it to allow the car to not apply its brakes. Then it was fine for a day or two.
To be 100% fair I never really liked the tow vehicle, a 2023 Buick Encore that was the tow either. I have always had Jeep Grand Cherokees and setting them up to tow was simple. This Buick was a PIA to say the least. At least once every three or four days it would not start after five or six hours of towing. It had a charge wire but that didn't seem to do a lot of good. It needed a Knife brake switch on the ground post, which it had, yet it could and would turn on the radio or wipers all by itself, so the ground knife switch was being bypassed someplace. I had this car due to the motorhome I was using was a MB chassis. I was a Porsche Tech in my past life so settign this unit up should not have been this difficult.
I’m happy to say that motorhome is gone and replaced with a Diesel Pusher like I had before and the car is gone and replaced with a Jeep Grand Cherokee as well. I have gone back to an Airforce One unit, and all is well.

So was it the Brake Buddy that was the issue or was it the Buick. In either case they do not go together very well.1757887

Are we sending this car to the moon?
What is with the overengineered crap you are sending me and on top of that you are sending me another cable set for my lights hookup?
$[XX]+ later for the overengineered brake buddy which has electronics which WILL break sooner than later.
I asked for a NON electronic supplemental braking system.
Just where is all this junk going to be fitted ? AND what am I going to do with ALL the extra wiring you sent?
What is it going to cost to install this???….or is it a matter of “he has an RV, he must be loaded!” I am not and definitely not after this!
And I specifically asked for a kit that will not break the bank.
I am definitely not happy with this. You can expect my returning this “brake buddy”
There are simpler ways to stop a car.1548407

Brooke M.

4/11/2023

I hear you, these can be pretty labor intensive to install. The perk to this part is that once it is installed, it is a one and done deal.

by: William06/30/2023

Please ket me know if the control module can be installed, so that it is not always drawing battery power?.
When in storage, or parked.... there is No way to turn unit off without disconnecting the battery cables under hood. Terrible inconvenience to have to go through this!? What about an on/off switch? I like the unit, but not the fact that it constantly drains my battery! Help???1612849

by: Douglas03/31/2024

Horrible product, would not ever buy again. This product is much more complicated than it needs to be. It is subject to the poor workmanship of the RV dealer mechanics. Do NOT buy.1757186

by: Eben05/11/2023

Works great but it took some time & effort to install. Hooking up to RV is easy and has been good - except when I forget to replace the wire harness cover for the car.1575700

by: Rich03/07/2023

Helen in customer service is great, very knowledgeable and helpful. She set me up with a Road Master Nighthawk tow bar, I have used it multiple times and it works great!1531574

Paul was fantastic in getting me what I needed.1687220

by: Richard 01/11/2023

GMC Canyon

Installing was a bit time consuming I installed behind the drivers seat on a GMC canyon extended cab. It was a tight fit and O added a bolt to the slide rail of the seat adjustment so the seat wont hit the controller. there seems to be a sequence when connecting the tow vehicle as some times the light is in error mode and I have to reset it to be active. As for stopping the tow vehicle I have no idea as I can't tell its back there anyway. 4 stars is because I have to reset it once in a while.1497571

by: SteveW01/28/2023

Great item but the vacuum pump provided is inadequate, especially if you often deal with mountain passes or other travel that requires more than an occasional single brake application. We upgraded the vacuum pump and now the system is awesome - easily the best we've ever had.1509457

by: Dave09/21/2023

Works great, completely satisfied with these!1672897

Love that the Brake Buddy is out of the way when installed in our Rubicon. We don't even notice it until we need it. It was straight forward to install the system; just follow the included instructions and all parts needed were in the kit. We installed our unit behind the driver's seat against the sidewall. It fit there and doesn't take up much room. We put a piece of interior carpet on the top for an armrest. It brakes perfectly, when needed.1399201

Brake Buddy arrived with 2 missing parts. Contacted manufacturer and got parts 2 weeks later. Plastic "T" fitting broke, and installer had to improvise using a brass fitting rather than wait for a replacement part that isn't durable anyway.1434305

To date I have been unable to see how the system works. Unknown to me it will only work with the Brake controller they send with the unit. Now I have to uninstall the built in factory unit out of my Ford, and install theirs under dash. This is not only annoying but I'll have two controllers to confuse anyone other than me,, and have received no call backs from [Brake buddy] tech support with any other options.1196108

Sierra K.

11/8/2021

I spoke with Hopkins and they confirmed that the Brake Buddy Stealth # HM39530 can only be used with the included brake controller.

Helpful Links

p-HM39530.html

by: Erik05/24/2022

2006 Suzuki Grand Vitara

I installed the break buddy in my 06 Suzuki Grand Vitara. I was looking for a way to get braking when I flat tow the Suzuki but would be unobtrusive when I am just driving around. The break buddy was the answer. Except for the clamp above the break pedal I would not be able to tell it is installed but when we pull the Suzuki, I have lights and breaks.1301514

by: Zac06/09/2021

This system, when sorted, works pretty well. It's also extremely easy to hook up and go, requiring none of the traditional nonsense associated with braking systems. Their all-in-one connector is excellent, and really works well. That said, it's been a long road (over a month) to get it installed and at a point where it safely stops the towed car.

June 9: I ordered the Brake Buddy Stealth kit for my 2017 GMC Acadia V6.

July 5: I set about installing the kit, and realized that I was missing the harness and umbilical from what appeared to be an open box item. Called Hopkins tech support, and they stepped up and sent replacement parts for what was probably an unscrupulous customer's swindle. Kudos!

July 12: Install attempt round two. This time the install is successful, however, the controller that mounts in the towed vehicle is acting like it's fried. I called tech support and again, Hopkins stepped up and sent a replacement controller.

July 18: Receive controller and install. Appears to have fixed the problem. But now, the brake pedal is only pulling in a quarter of an inch when testing breakaway or trying to actuate it with the test button on the controller. I called tech support again and determined it's a bad main unit. I ordered a whole new kit, figuring I'll get good parts from one kit and send back the bad parts.

July 21: New kit arrived. I replaced the main unit and it changed nothing. Start advanced troubleshooting. Check voltages at the main unit under varying conditions - everything checks out. Detach the cable from the brake pedal and determine that the thing actually does stroke about four inches. Turns out the overload protection in the main unit is functioning as intended because too much effort is required to move the pedal. I test the vacuum pump and it's working as designed.

I then moved the cable attachment point to the very bottom of the brake pedal for leverage. This isn't what was shown in the instructions, but I was able to make it work and it did help - brake now moved about 2 inches. Then I tried testing it with the towed car idling (to provide good vacuum) and found that the pedal would move about 4 inches before the protection overload would stop it. The conclusion - not enough vacuum.

I tested the car's booster line with a vacuum gauge while running, and noted that it was pulling 25 inches of mercury (inhg). Tested the vacuum with the pump doing the work (engine off), and found that it would kick on at 10inhg and shut off at 15inhg. So the reason the system only works when the car is running is because the supplied vacuum pump is inadequate, providing ~10 less inches of vacuum than the car needs for proper booster operation.

Then I did some research on the Dorman vacuum pump in the kit. It's used in Ford trucks to provide accessory vacuum when starting the car for stuff like the AC controls. It's really not intended for something as significant and critical as braking. In any event, I took it apart and found that I had some wiggle room on the thresholds. I adjusted the contacts in the vacuum switch, and got it to the point where it would kick on at 15inhg and run it up to about 20inhg. Reinstalled the pump and took the car for a tow test, and it worked pretty well for well spaced braking events.

However, the vacuum pump ran every time I pressed the brake, and did so for 90-120 seconds. That wasn't going to cut it for multiple braking events within a one to two minute period (think traffic). Also, it sounded like it was working really hard to build 20inhg, and I suspected that it wouldn't be lasting very long. If it were to fail, I wouldn't have towed car braking, and that's no good since I'm taking my wife and four little kids on a cross country trip next month.

So rather than start over, I set about fixing the vacuum deficit at the beginning of August. For around a hundred bucks, I was able to get a Volvo brake booster vacuum pump and a multicomp vacuum switch (search [online vendor]). I made a mounting plate and used these two pieces with a relay to power the pump directly from the battery (picture attached). The result is that I can maintain vacuum between 19-23 inches, and the system now seems to work great. This vacuum pump is far superior, and only runs for about ten seconds between braking events.

Despite the fact that I'm good to go now, the vacuum pump included with the kit is sub-par and is now sitting in my parts bin. I contacted Hopkins with all of this information, and while they were responsive and helpful throughout this adventure, their engineers' final determination was that the provided vacuum pump should get the job done. That may be true for a Honda Civic, but in practice (and in fact) is was not adequate for my Acadia. In other words, unless you're really technically competent, I'd consider other options.1060291

by: Tom07/31/2021

The design concept is great but I have had a couple problems. I have not yet contacted the manufacturer. It has acted like a breakaway situation after disconnecting the cable even though I put the cap on the jack i.e. the brake pedal stays active.

Sometimes when driving the toad it loses vacuum assist. I tried putting in a check valve in the line from the vacuum pump but that did not help. I disconnected that vacuum line and capped the tee and did not experience loss of vacuum assist. I reconnected the line to the vacuum pump had trouble twice but after a fair amount of driving, did not have trouble again. Mostly the problem occurs when first putting the car in gear after starting the engine.

TIP FOR ALL TOAD TOWERS:
I mounted a bright red LED strip to the front of the toad and wired it to the actual brake light switch in the toad. The light allows me to use the RV's backup camera to confirm whether the brake pedal is getting activated and released properly. Unfortunately, I have not had a chance to road test that. (Use a switch or quick disconnect so that it can be disabled for regular driving.)1110304

This system, when sorted, works pretty well. It's also extremely easy to hook up and go, requiring none of the traditional nonsense associated with braking systems. Their all-in-one connector is excellent, and really works well. That said, it's been a long road (over a month) to get it installed and at a point where it safely stops the towed car.

June 9: I ordered the Brake Buddy Stealth kit from eTrailer for my 2017 GMC Acadia V6.

July 5: I set about installing the kit, and realized that I was missing the harness and umbilical from what appeared to be an open box item. eTrailer stepped up and sent replacement parts for what was probably an unscrupulous customer's swindle. Kudos!

July 12: Install attempt round two. This time the install is successful, however, the controller that mounts in the towed vehicle is acting like it's fried. I called tech support and again, eTrailer stepped up and sent a replacement controller.

July 18: Receive controller and install. Appears to have fixed the problem. But now, the brake pedal is only pulling in a quarter of an inch when testing breakaway or trying to actuate it with the test button on the controller. I called tech support again and determined it's a bad main unit. I ordered a whole new kit from eTrailer next day air. I figure I'll get good parts from one kit and send back the bad parts.

July 21: New kit arrived. I replaced the main unit and it changed nothing. Start advanced troubleshooting. Check voltages at the main unit under varying conditions - everything checks out. Detach the cable from the brake pedal and determine that the thing actually does stroke about four inches. Turns out the overload protection in the main unit is functioning as intended because too much effort is required to move the pedal. I test the vacuum pump and it's working as designed.

I then moved the cable attachment point to the very bottom of the brake pedal for leverage. This isn't what was shown in the instructions, but I was able to make it work and it did help - brake now moved about 2 inches. Then I tried testing it with the towed car idling (to provide good vacuum) and found that the pedal would move about 4 inches before the protection overload would stop it. The conclusion - not enough vacuum.

I tested the car's booster line with a vacuum gauge while running, and noted that it was pulling 25 inches of mercury (inhg). Tested the vacuum with the pump doing the work (engine off), and found that it would kick on at 10inhg and shut off at 15inhg. So the reason the system only works when the car is running is because the supplied vacuum pump is inadequate, providing ~10 less inches of vacuum than the car needs for proper booster operation.

Then I did some research on the Dorman vacuum pump in the kit. It's used in Ford trucks to provide accessory vacuum when starting the car for stuff like the AC controls. It's really not intended for something as significant and critical as braking. In any event, I took it apart and found that I had some wiggle room on the thresholds. I adjusted the contacts in the vacuum switch, and got it to the point where it would kick on at 15inhg and run it up to about 20inhg. Reinstalled the pump and took the car for a tow test, and it worked pretty well for well spaced braking events.

However, the vacuum pump ran every time I pressed the brake, and did so for 90-120 seconds. That wasn't going to cut it for multiple braking events within a one to two minute period (think traffic). Also, it sounded like it was working really hard to build 20inhg, and I suspected that it wouldn't be lasting very long. If it were to fail, I wouldn't have towed car braking, and that's no good since I'm taking my wife and four little kids on a cross country trip next month.

So rather than start over, I set about fixing the vacuum deficit. For around a hundred bucks, I was able to get a Volvo brake booster vacuum pump and a multicomp vacuum switch (search Amazon). I made a mounting plate and used these two pieces with a relay to power the pump directly from the battery (picture attached). The result is that I can maintain vacuum between 19-23 inches, and the system now seems to work great. This vacuum pump is far superior, and only runs for about ten seconds between braking events.

Despite the fact that I'm good to go now, I feel like the vacuum pump included with the kit is sub-par. I contacted Hopkins with all of this information, and while responsive and helpful, their final determination from "the engineers" was that the provided vacuum pump should get the job done. That may be true for a Honda Civic, but in practice (and in fact) is was not adequate for my Acadia. In other words, unless you're really technically competent, I'd consider other options.859416