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  1. Trailer Brake Controller
  2. Ford
  3. E-Series Cutaway
  4. 2017
  5. CURT
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
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Call etrailer.com at 1-800-940-8924 for expert service. We are your Ford trailer brake controller experts, and offer a great price. etrailer.com carries a complete line of CURT products for your Ford E-Series Cutaway 2017. Curt Discovery NEXT Trailer Brake Controller - 1 to 4 Axles - Time Delayed part C84VV from CURT can be ordered online at etrailer.com. Complete trailer brake controller installation instructions and technical support.
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  • Reviews (16)
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CURT Trailer Brake Controller - C84VV

  • Electric
  • Electric over Hydraulic
  • Time Delayed Controller
  • Up to 4 Axles
  • CURT
  • Under-Dash Box
  • Dash Mount
  • Automatic Leveling
  • LCD Display
  • 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:  4.7 out of 5 stars   (16 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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Took about 10 minutes to install. Have not made all the adjustments yet, but is easy to understand.



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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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See what our Experts say about this CURT Trailer Brake Controller

  • Brake Controller Install Harness Recommendation for Curt Brake Controller in 2009 Chevy Silverado
    To install the Curt brake controller part # C84VV in your 2009 Chevy Silverado requires the install harness part # C51515 but this is a harness with 4 blunt cut wires that you'd need to wire to the blunt wires under the dash of your truck since a plug and play harness isn't available. It's a pretty simple process though. You'd just need blue butt end connectors like the # DW05744-5 and you'd be set. I attached an install video that shows the install on a similar Silverado for you to check...
    view full answer...
  • Curt Brake Controller Adapter Harness for a 2020 Jeep Grand Cherokee
    In order to install the Curt Discovery Trailer Brake Controller part # C84VV on a 2020 Jeep Grand Cherokee you will need the Curt Custom Wiring Adapter for Trailer Brake Controllers part # C51446 which makes for a plug and play installation.
    view full answer...
  • 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
  • What Is The Blue Connector For In The Glove Box Of The Ram 2500
    I will be happy to explain how why the blue plug would not be installed in the wiring bundle. The blue plug is an adapter that's used to install an after-market brake controller. When installing a brake controller vehicles sometimes already have a plug and play connection under the dash. A plug and play connection is a connection that does not require the brake controller to be hardwired to the vehicle. Some brake controllers like # 90195 will need a plug or adapter like you have the #...
    view full answer...
  • Curt Discovery Brake Controller # C84VV Generates Output Signal at All Times
    Thank you for your recent purchase from etrailer of a Curt Discovery Brake Controller # C84VV and harness # C51515. The blue output wire on your Discovery brake controller should carry an output signal under two conditions: when the brake pedal is pressed or when the manual override slide bar is engaged. Since your unit generates output continuously without either of these conditions met this means that either the unit is malfunctioning or that the red input signal wire to the controller...
    view full answer...
  • Hub/Drums and Brake Assemblies for Use with Timbren 3,500 lb Axle Less
    All of the parts you mentioned would work great with each other. You didn't mention the part numbers but I was able to determine what you were looking at based on title. The Timbren kit looks to be the part # TASR35HDS11 Hubs # AKHD-655-6-EZ-K Brake assembly set # 23-458-459 Curt Discovery # C84VV Install Harness # C51459
    view full answer...
  • Wiring Adapter for Curt Brake Controller on 2008 Toyota Tacoma
    If your 2008 Toyota Tacoma has a factory 7-way, the only thing you will need to install the Curt Discovery Trailer Brake Controller # C84VV is the Curt Custom Wiring Adapter # C51362 which will plug into the port underneath the dash of your '08 Tacoma. If your truck does NOT have the factory 7-way you would need to add 4-way # 118496 along with Universal Installation Kit for Trailer Brake Controller # ETBC7. You will also need to use Universal Wiring Adapter for Curt Trailer Brake Controllers...
    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
  • Wiring Adapter for Installing Curt Discovery Brake Controller on 2014 Ford Explorer
    To install the Curt Discovery # C84VV brake controller on your 2014 Explorer, you'll need the Curt wiring adapter, part # C51322.
    view full answer...
  • 7-Way Trailer Connector for 2004 Jeep Liberty with 4-Way Connector
    Since your 2004 Jeep Liberty already has a 4-Way you just need to install the Universal Wiring Kit # ETBC7 for a fully functioning 7-Way. This comes with all of the wiring and parts needed to give you 12V power and brake controller power at the rear of your Jeep Liberty. You can use the No-Drill Bracket # C57202 to keep the 7-Way/4-Way connector right by your hitch receiver. If the brake controller in your truck is integrated or you would rather avoid removing it just to move your boat...
    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 Flashing 0.0 Error Message on Curt Discovery Brake Controller # C84VV
    The troubleshooting guide included in the instructions for the Curt Discovery Brake Controller # C84VV that you referenced does not include this particular display issue, a flashing 0.0, among the possible display messages. My technical contact at Curt has never seen this particular message displayed on a Discovery brake controller. He suggested that either the display is malfunctioning or the controller is bad. Since your brakes are not engaging when you press the pedal with the trailer...
    view full answer...
  • Issues with Brakes Not Activating with Curt Discovery Brake Controller on 2015 Ram 1500
    I spoke with my contact at Curt about the issues you and other customers have experienced with their Curt Discovery Brake Controllers # C84VV and newer model Ram trucks. The problem stems from a low voltage output on the stoplight wire on the truck. The Discovery requires 12 volts from the stop light wire in order to recognize the signal and activate the trailer brakes. Curt has found that the newer Ram trucks often have less than 12 volts at the stop light wire when the brake pedal is...
    view full answer...
  • Is There an Under-Dash Brake Controller Connection Port on the 2005 Mazda B3000 DS Pickup
    An under-dash quick-connect brake controller port is not offered by Mazda on their smaller pickups, so your brake controller will require a hard wire installation. You will use the # ETBC7 brake controller installation kit that you referenced. A video and article on installing this kit are included for you. If your truck has a 7-way already you can instead use kit # 5506. If your truck does not already have a 4-pole flat trailer connector at the rear bumper you will also need a wiring...
    view full answer...
  • Troubleshooting Horse Trailer Brakes that Lock Up when Trailer Connector is Connected
    To install the Curt Venturer part # C84VV in your 2016 Nissan Frontier requires the install harness part # C51382 which is a confirmed fit. In a lot of cases the wire colors don't always match up perfectly as sometimes the manufacturers will change wire colors or they use all-together non-standard colors but we know the harness mentioned is the correct one for your Frontier. Since you have a horse trailer and the brakes are locking up I suspect the issue is related to the trailer connectors....
    view full answer...
    Image 1 for
  • Troubleshooting 7-Way and Brake Controller Wiring on a 1997 Dodge Ram 2500
    To have a brake controller function properly you will need to have a 7-way on your vehicle instead of the 4-way. Don't worry, I can help you get your Ram equipped for your RV. Thanks for sending your images, they really helped explain the situation. The simplest way to install the brake controller is to hardwire the vehicle. The part you will want to do this is the # ETBC7, this will adapt your 4-way harness that you currently have and provide you with the added wiring to make the connections...
    view full answer...
    Image 1 for Image 2 for
  • Curt Discovery Trailer Brake Controller # C84VV Displays Only a Red Dot After Installation
    If your Curt Discovery Trailer Brake Controller # C84VV displays only a red dot when you do NOT have a trailer connected then this indicates that the controller's red (input signal) wire is connected to the wrong side of the brake light switch. This red wire should connect to the COLD side of the switch that has power only when you press the brake pedal. If your Discovery displays the red dot when you DO have a trailer connected then this usually indicates a problem in the trailer brake...
    view full answer...
  • Trailer Hitch Recommendation for 1996 Cadillac Fleetwood Hearse with 38 Inch Frame
    While a custom fit hitch for your 1996 Cadillac Fleetwood Hearse is not an option, the Multi-Fit Trailer Hitch # 5350 may work for you. The hitch is adjustable to fit vehicle frames from 24 to 46 inches wide, has a capacity of 5,000 lbs and features the 2 inch receiver you wanted. It requires no welding and all hardware to install it is included. Since your frame is recessed a good 16 inches behind the vehicle's fascia, your best option is to go with an extra long ball mount like # EA40...
    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...
  • Recommended Brake Controller Wiring Harness For 2013 Toyota Tundra
    If your 2013 Toyota Tundra has the factory 7-way installed, the Curt Custom Wiring Adapter, part # C51362 will be what you need to connect the Curt Discovery Trailer Brake Controller, part # C84VV. If you have a 4-way connector installed on your Tundra, part # C51515 is what you need. This harness is used on a vehicle that does not have a factory tow package or on one that has a brake control harness but is not equipped with a plug-in port. If your vehicle doesn't have a factory tow package,...
    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...
  • 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...
  • Curt Trailer Brake Controller Options For a 2018 Toyota Highlander
    To keep the harness that is used for the Curt Triflex on your 2018 Toyota Highlander there are a few options. The Curt Spectrum Trailer Brake Controller # C51170 which is a proportional unit that when installed you only see a control knob that allows you to adjust all of the systems settings, and 10 tri-color LED lights to display settings and diagnostics. Another option is the Curt Venturer Trailer Brake Controller # C74VV which is a Time-Delayed unit that allows for you to adjust the...
    view full answer...
  • How to Find and Access the Brake Light Switch Wire on a 2015 Toyota Highlander for Brake Controller
    If you check out the video I attached you will see how we installed a brake controller in a very similar 2014 Toyota Highlander as your 2015 model. We had to remove the lower dash panel (13:00 mark of the video), to make accessing the green wire possible. The kit used for the install in the video is the part # ETBC7.
    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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