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  1. Trailer Brake Controller
  2. CURT
  3. Electric
  4. Electric over Hydraulic
  5. Time Delayed Controller
  6. Up to 4 Axles
Curt Discovery NEXT Trailer Brake Controller - 1 to 4 Axles - Time Delayed

Curt Discovery NEXT Trailer Brake Controller - 1 to 4 Axles - Time Delayed

Item # C84VV
Retail:$131.95
Our Price: $99.95
You Save: 24%
Trailer Brake Controller
Shipping Weight: 0.66 lbs
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An easy-to-read digital number display, 10 power levels, and a pinch-trigger manual override make this time-delayed brake controller easy to use. Installation is simple with no mounting restrictions. Activates brakes with a preset intensity. Great Prices for the best trailer brake controller from CURT. Curt Discovery NEXT Trailer Brake Controller - 1 to 4 Axles - Time Delayed part number C84VV can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (14)
  • Q & A (0)
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CURT Trailer Brake Controller - C84VV

  • Electric
  • Electric over Hydraulic
  • Time Delayed Controller
  • Up to 4 Axles
  • CURT
  • LCD Display
  • Dash Mount
  • Under-Dash Box
  • Automatic Leveling
  • Up to 360 Degrees

An easy-to-read digital number display, 10 power levels, and a pinch-trigger manual override make this time-delayed brake controller easy to use. Installation is simple with no mounting restrictions. Activates brakes with a preset intensity.


Features:

  • Brake controller activates trailer brakes with preset intensity
  • Adjustable power output control lets you select the amount of braking force
    • Rocker switches located on left front of module for easy access
  • 10 Gain settings and 9 load settings allow you to adapt to various driving conditions
    • Select a higher setting for harder braking and lower for more gradual braking
  • Pinch-trigger manual override is within easy reach for controlling trailer sway or stopping in emergencies
  • Simple LED display shows the amount of power output
    • Self-diagnostics monitor trailer connection and check for shorts
  • LCD display shows power adjustments in 0.5 increments
    • Brightness is adjustable for optimal visibility
  • Auto-sleep mode prevents battery drain after 5 minutes of idle time
  • Quick and easy installation with no mounting restrictions
    • No need to mount level - install anywhere at any angle
    • Included mounting bracket and hardware designed to hold the brake controller flush against the dash
    • Plug-in, vehicle-specific brake control adapter (sold separately) available for select vehicles to reduce installation time


Specs:

  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Compatible with low-volt, PWM, ABS, cruise control, and electric-over-hydraulic trailer brakes
  • Dimensions: 4" long x 3-1/8" wide x 1" tall
  • Limited lifetime warranty


Gain Adjustment

Gain control lets you set the maximum amount of power that will be applied to your trailer's brakes, adjusting in increments of 0.5. How much braking output you need is determined by the weight of your trailer; a heavier trailer will need more power to bring it to a stop. You want to go as high as you can without the trailer brakes locking up. Typically, the gain is only readjusted when you experience changing road conditions or if the weight of your trailer changes. To get more power to your brakes, press the upper orange rocker switch. To decrease the gain, press the lower switch. When you make your adjustment, the gain setting will show on the LED screen for 10 seconds as a series of bars and then go into sleep mode.


Load Control

Once you have the gain set, you can fine-tune your braking by adjusting the load control on a scale of 1 to 9. This controls the aggressiveness of your trailer's braking, meaning how quickly the brakes reach the maximum braking level. Load control can get the braking power to your trailer faster and with more intensity so that it doesn't push your tow vehicle forward. If your vehicle takes too long to come to a stop, increase the setting by pressing the upper black rocker switch. If it stops too abruptly, decrease the setting by pressing the lower switch. You can alter the setting to suit your driving preferences or to improve handling based on changing road conditions or varied trailer loads.


Pinch-Trigger Manual Override

The Discovery comes with a easy-to-reach, pinch-trigger manual override, great for stopping sway or controlling your trailer's momentum in emergencies. To engage the manual override, just push in the trigger. This will activate the trailer's brakes and brake lights without you having to apply the brakes on your tow vehicle, perfect for limiting trailer movement while you're cruising.


LED Display

The LED display on the Discovery is large and easy to read at a glance. It will show you what setting the brake controller is on as well as give you information for troubleshooting. You can adjust the screen brightness or trigger night mode so it won't glare obnoxiously on your dash. Press the control button to cycle through the different modes.


Curt Discovery NEXT

Quick Installation

Because inertia plays no role in the functioning of this controller, you do not have to mount the unit at any particular angle. Your mounting options are limitless, so long as you can still easily access the controller and the manual override. The included bracket is designed to mount the brake controller flush to the dash so it takes up almost no space at all.


If your vehicle already has a plug-in brake controller wiring harness, just connect the unit to it. Otherwise, you will need to purchase a vehicle-specific wiring harness (sold separately) to plug into. If a harness is unavailable for your vehicle, hardwiring will be necessary.


Note: If a custom brake control wiring adapter is not available for your vehicle, one of the following will be required:

20-Amp circuit breaker (9506P - sold separately) for 2- to 4-brake applications

30-Amp circuit breaker (38630 - sold separately) for 6- to 8-brake applications


See also etrailer.com's exclusive 7- and 4-way brake control installation kit (ETBC7 - sold separately) if you don't already have a 7-way plug at the back of your vehicle.


Time-Delayed Braking

what is time-delayed braking

The Curt Discovery comes equipped with time-delayed braking. Every time you apply the brakes in your vehicle, a signal is sent - via the brake switch - to the Discovery. The controller then sends power out to your trailer brakes to activate them with an intensity set by you, at a rate determined by you. Both the amount of braking power (gain) and rate of application (load) can be adjusted to suit your preference, the road conditions, the type of trailer, and the weight of your load. To determine which levels are best for your application, test your towing setup and choose what feels right.



51126 Curt Discovery NEXT Time Delay Trailer Brake Control - 1 to 4 Axles

Replaces Curt 51120

Installation Details C84VV Installation instructions



Customer Satisfaction Score:


Customer Reviews

Curt Discovery NEXT Trailer Brake Controller - 1 to 4 Axles - Time Delayed - C84VV

Average Customer Rating:  4.6 out of 5 stars   (14 Customer Reviews)

An easy-to-read digital number display, 10 power levels, and a pinch-trigger manual override make this time-delayed brake controller easy to use. Installation is simple with no mounting restrictions. Activates brakes with a preset intensity.

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Tested . Work fine and advertised



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excellent service and delivery.



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Like its compact size and simple operat ion.



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Very helpful, knowledgeable and friendl y!



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14
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See what our Experts say about this CURT Trailer Brake Controller

  • How to Properly Set Up Curt Discovery Time Delayed Brake Controller
    To properly set up the Curt Discovery brake controller part # C84VV you first need to set the max output setting with the thumbwheel (number 2 in picture) on top of the controller. You want to adjust this to a setting that when you slide the manual override lever (number 4) all the way grabs the brakes as hard as possible right before locking up. Once that's set the next setting is the sync setting (lever on side number 3) which controls how fast the brake pressure ramps up to full pressure....
    view full answer...
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  • Parts Needed to Add 7-Way & Brake Controller to 2014 Nissan Murano SL
    Since you already have a 4-way like # 55571 on your 2014 Nissan Murano SL, you'll just need one part to add a 7-way: - Universal Installation Kit for Trailer Brake Controller # ETBC7 You'll plug the 4-way into the 7-way that comes with the # ETBC7, which also gives you the wiring, circuit breakers, and rest of the hardware needed for installation. After that all you need is the brake controller and harness, and for that a good option is a simple, no-frills controller, the Curt Discovery...
    view full answer...
  • Where to Connect the Adapter to Install a Curt Brake Controller in a 2017 Nissan Pathfinder
    To install a Curt Brake Controller, like the Discovery # C84VV, on your 2017 Nissan Pathfinder you will simply need to plug the Custom Wiring Adapter # C51382 under your dash like you mentioned. I am attaching a video where one of our install guys installed a Tekonsha Prodigy P2 # 90885 in a 2013 Pathfinder using the Tekonsha Wiring Adapter # 3050-P. If you skip to the 2:45 mark you can see where he plugs in the adapter for the Prodigy P2. Your Curt adapter will plug into the same place.
    view full answer...
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  • OL Message on Curt Discovery Trailer Brake Controller
    There could be a few different things happening with your Curt Discovery Trailer Brake Controller part # C84VV. The first thing that could be happening is that you have a short on the red stop light switch wire. In order to rule this out you will need to probe the red wire going into the back of the brake controller. There should only be power on this wire with the brake pedal depressed. If there is when it is not then you know there is either a short in this wire or the stop light switch...
    view full answer...
  • Curt Time Delay Brake Controller Not Working with Brake Pedal on a 2015 Ram 1500
    First, make sure you are using the proper wiring harness for your 2015 Ram 1500 and Curt brake controller. You should be using # C51438. Next, check the stop light/CHMSL fuses on the truck. On a newer truck it is unlikely that fuses would be blown or missing but its easy enough to check. When a brake controller is not working with the brake pedal it usually means there is an issue on the red wire. With the brake controller plugged in and the fuses good though the only other thing it could...
    view full answer...
  • Troubleshooting a Curt Discovery part # C84VV Not Working on a 2002 Chevy Silverado 1500
    On certain model year Chevy and GMC trucks and SUVs there are some connections that need to be made under the hood to make everything fully functional. It happens on vehicles with or without the factory tow package. I checked your order notes and you also bought the Curt Wiring adapter part # C51342. To see what under the hood connections need to be made check out the link I provided to the right that details everything you would need to install a controller like the Curt Discovery part...
    view full answer...
  • Curt Brake Controller, Wiring Harness 1999 F-350 Super Crew
    The Curt brake controller # C84VV can plug directly into your 1999 F-350 Super Crew using the proper wiring harness, # C51322. This harness is sold separately. I have included a link to a video to the right that shows where the connection point on a similar truck. The brake controller and harness are different in the video but they plug into the same place on the truck.
    view full answer...
  • Adding a 7-Way Trailer Connector and Brake Controller to a 2004 Nissan Xterra
    I will be happy to clear up what all you will need to add the equipment to tow the trailer and activate the electric brakes. First, if your 2004 Nissan Xterra does not already have a trailer hitch you will need to add one. A popular option is Curt trailer hitch # 13183. This is a Class III hitch with a 2 inch receiver. The hitch itself is rated for 400 pounds tongue weight and 4,000 pounds gross trailer weight but limited to the vehicle capacity if lower. I also recommend etrailer ball...
    view full answer...
  • How Can I Tell if My 2013 Nissan Pathfinder Came With Factory Tow Package
    All 2013 Nissan Pathfinders came pre-wired for a tow package, so we know your Pathfinder at least has something. If your Pathfinder came with the tow package option from the dealer, then you would have a trailer hitch and trailer wiring at the back of the Pathfinder. Since you are asking for a wiring kit, I'm guessing you need the wiring still. For this I recommend the Curt 7-Way Wiring Harness, # C56357, if you want a 7-pin trailer connector or the Curt 4-Way Wiring Harness, # C56281,...
    view full answer...
  • Does Dealer Need to Turn on Aftermarket Brake Controller in a 2015 Ford F-150?
    There will be no need for you to go to take your 2015 Ford F-150 to the dealer to have them turn on an aftermarket brake controller. The brake controller I recommend that you need only an adapter for is the Curt Discovery # C84VV. Since you already have the factory tow package, just use the Plug-In Wiring Adapter # C51436. Plug one side into the brake controller and the other side into the wiring on your F-150 and you are done.
    view full answer...
  • Brake Controller Adapter Harness For 2022 Ram 1500 For Curt Discovery Brake Controller
    There is; I checked with Curt and verified for you the correct brake controller adapter harness for your 2022 Ram 1500 and the Curt Discovery Trailer Brake Controller # C84VV is the following: - Curt Custom Wiring Adapter for Trailer Brake Controllers # C51458
    view full answer...
  • Troubleshooting Brake Controller that Only Works with Manual Override Lever
    This is a fairly common problem and the solution is the red wire of the brake controller. Make sure it is connected to a circuit that only sees voltage when the brakes are applied and none when released. Most likely the connection is the issue and just reconnecting the circuit will cause the controller to work again. You can also check to make sure that the third brake light fuse is in good condition under the hood of the vehicle as well.
    view full answer...
  • 2014 Cadillac Escalade Wont Start After Curt Brake Controller Installation
    Thanks so much for the purchase from us of the Curt Discovery Trailer Brake Controller # C84VV for your 2014 Cadillac Escalade, and I'm sorry to hear of this issue you are having. This controller, which you'd use with Wiring Adapter for Curt Trailer Brake Controllers # C51515 assuming the Escalade had a factory 7-way already, should not have anything to do with the vehicle starting or not, which means there was a mistake somewhere along the way with the wiring process. I have added a link...
    view full answer...
    Image 1 for
  • Troubleshooting Curt Discovery Brake Controller Issues on Ram 1500
    The Curt Discovery Brake Controller # C84VV is a time-delay type that is intended to send out a pre-determined amount of braking power after you have applied the vehicle brakes. The other type that is often preferred is the proportional type that will actually sense the amount of braking force in the tow vehicle and send a proportional amount of braking power to the trailer, without a time delay. Based on the symptoms you described I think the issue could be with the wiring on the trailer....
    view full answer...
    Image 1 for
  • Brake Controller For 1993 Dodge Ram Truck
    To add a brake controller to your 1993 Dodge Ram truck, a great option is from Curt: - Curt Discovery NEXT Trailer Brake Controller # C84VV I like the # C84VV because it's a no-frills, easy to use, economical option that'll just get the job done - activating your trailer brakes. There are settings for the amount of braking you want, an LED display that shows the power output, and an auto shut-off. So it's really simple but also effective, and the only other thing you will need is the...
    view full answer...
  • Troubleshooting Trailer Brakes that Lock Up When Trailer Is Connected
    There is a short or a mis-wire on the 7-way you installed. It sounds like the 12 volt accessory circuit is shorting out to the brake output circuit which is causing the brakes of the trailer to lock up anytime the 7-way is connected. This is a fairly common issue as wiring up connectors is a bit confusing. Since the controller never senses a connection it sounds like the problem is the circuits just being wired backwards. I attached a chart that has what the 7-way pin out should look like.
    view full answer...
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  • Wiring Harness to Install Curt Discovery Brake Controller on 2010 Toyota Tundra
    In order to install the Curt Discovery Trailer Brake Controller part # C84VV on a 2010 Toyota Tundra you'll need the Curt Custom Wiring Adapter for Trailer Brake Controllers part # C51362.
    view full answer...
  • Replacement Brake Controller that is More Reliable Than Curt Discovery
    You have successfully diagnosed your Curt Discover brake controller part # C84VV as having an internal issue. It really is a bummer if this is the second one you recieved with an internal issue but I can't say I am too shocked since we've seen the Curt brake controllers be pretty problematic. The Draw Tite Activator part # TK90160 is a similar controller that is MUCH more reliable.
    view full answer...
  • Troubleshooting Brake Controller Install Where Brakes Lock Up As Soon as Brake Pedal is Touched
    Since your controller is not showing a connection and your brakes are locking up anytime the brake pedal is touched that means that instead of having the brake output circuit connected to the trailer brakes (blue wire of controller) you have a stop/turn signal circuit connected to the circuit instead. You can test this pretty easily by turning on either blinker and you should feel the trailer brakes lock up with the blinker getting activated. Since your brake controller would have been...
    view full answer...
    Image 1 for
  • Troubleshooting Brake Controller that Only Works with Manual Override Lever
    The issue is related to the stoplight circuit that the brake controller connects to with it's red wire. The red wire of the controller needs to connect to a circuit on the vehicle that only sees voltage when the brakes are applied. Most likely the red wire lost connection to where it was installed or you blew a third brake light fuse which killed this circuit as well. I also attached a help article on troubleshooting brake controller installs for you to check out as well.
    view full answer...
  • Troubleshooting Trailer Brake Controller that Only Functions When Engine Isnt Running
    That is an interesting problem you are having, but the problem lies somewhere in the wiring of the brake controller/7-way. The only way a brake controller is going to work properly with the key in the ACC position but not when the vehicle is running has to be due to wiring. Check to make sure there are no shorts between the two wires you ran to the rear of the 7-way. It sounds like you ran a wire for the 12 volt accessory circuit and an additional wire for the brake output. You might...
    view full answer...
    Image 1 for
  • Troubleshooting Brake Controller that Flashes When Connected to Trailer
    It sounds like the problem is corrosion on the trailer 7-way brake output circuit which is causing the controller to only show an intermittent connection. Try cleaning off this pin on the 7-way with some fine grit sandpaper. Testing the brake controller is fairly easy. Sever the blue brake output wire near the brake controller leaving enough room to reconnect it and then apply the manual slide. Using a circuit tester like part # PTW2993, you should get output to the controller side of...
    view full answer...
  • Curt Discovery Brake Controller Shows OL Error When Trailer is Connected
    It is possible that it is a simple wiring issue that is causing the errors on your Curt Discovery brake controller # C84VV. On your 2010 Chevy Silverado, there is a tow package wire bundle under the dash to wire in a brake controller. The tow package red goes to brake controller black. White goes to white, blue to blue, and the light blue or orange wire on the truck goes to the brake controller red wire. The OL indicates an overload and if all of the connections at the brake controller...
    view full answer...
  • Parts Needed to Add 7-Way and Brake Controller to 2007 Ford F-150 with 4-Way
    If your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way. If you do have trailer brakes you would need the # 3035-P, the # 37185, and a brake controller. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and how easy it is to set up. Follow the 4-way trailer connector wires from the trailer connector to the front...
    view full answer...
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Do you have a question about this Trailer Brake Controller?


Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Chris R
Video Edited:
Chris R
Employee Michael B
Installed by:
Michael B
Employee Aidan B
Installed by:
Aidan B
Employee Charles A
Video by:
Charles A
Employee Amanda K
Written by:
Amanda K
Employee Ian F
Test Fit:
Ian F

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