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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 (5)
  • Q & A (0)
  • Photos

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:  5.0 out of 5 stars   (5 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.

by:

Like its compact size and simple operat ion.



by:

Very helpful, knowledgeable and friendl y!



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5
5

See what our Experts say about this CURT Trailer Brake Controller

  • Troubleshooting Brake Controller that Doesnt have 12 Volts on Red Wire when Brakes are Applied
    The red wire of the controller needs to be showing voltage when you apply the vehicle brakes otherwise the controller is never going to activate when you apply the vehicle brakes. You need to verify the circuit you are trying to connect that wire to has 12 volts when the brakes are applied. Issue could also be the connection isn't being made completely and you'd just need to make the connection better.
    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
  • What Is The Difference Between Proportional and Time Delayed Trailer Brake Controllers?
    The Curt TriFlex NEXT Trailer Brake Controller # C24VV you are looking at is a proportional controller. This means when you press on the brakes the controller is going to have an inertia sensor which then factors in how quickly the vehicle is stopping and adjusts the amount of power going to the trailer brakes from your original setting. The easiest explanation I can give you is when you lightly press the brakes to slow down this controller will lessen the amount of power sent to the trailer...
    view full answer...
    Image 1 for Image 2 for
  • 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...
  • Brake Controller Installation 2004 Chevy Avalanche
    Your Avalanche should be prewired for a brake controller. Check the fuse panel in the engine compartment. Remove the outer and the inner fuse box cover, and on the inboard side of the fuse box, you'll see two threaded studs. The stud closest to the rear of the vehicle powers the brake controller, there should be a 30A fuse installed next to it. The stud closest to the front of the vehicle powers the 12V feed to the trailer connector. There should be a 40A fuse installed next to it. If the...
    view full answer...
  • 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...
  • Adapter Needed to Install the Curt Discovery on a 2005 Ford F-150
    To install the Curt Discovery Trailer Brake Controller # C84VV on your 2005 Ford F-150 you will need the Curt Custom Wiring Adapter # C51322. This connector will be found under the dash on your driver side. I have attached a video of this adapter being used to install the Curt Venturer on a 2004 F-250 that you can use as a reference.
    view full answer...
  • No Brake Output on Curt Discovery Trailer Brake Controller
    If you have power going into the Curt Discovery Trailer Brake Controller part # C84VV on the black wire, the ground has good continuity, and you have power on the red wire while the pedal is pressed and there is no output on the blue wire then it's safe to say the controller is bad and will need to be replaced. That said, please make sure you are checking the wires directly behind the controller so you can rule out any other issues down the line. The Curt Discovery is a timed delay controller...
    view full answer...
  • 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...
    Image 1 for
  • Harness Needed To Install Curt Trailer Brake Controller On 2021 Nissan Frontier w/ Tow Package
    In order to install the Curt Discovery part # C84VV on a 2021 Nissan Frontier with factory tow package you'll simply need the Curt Custom Wiring Adapter for Trailer Brake Controllers part # C51382.
    view full answer...
  • Turn Signals Work But Brake Lights Do Not Light Up
    You came from a brake controller page when you asked the question. Is this issue related to the installation of the brake controller? Or are we just talking about brake lights on a trailer or vehicle? If it is on the trailer then usually there is a bad ground connection since the brake lights draw more constant power than the turn signals. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached...
    view full answer...
  • Troubleshooting Flashing Display of the Curt Discovery Brake Controller part # C84VV
    The flashing O.L. message with the Curt Discovery Brake Controller part # C84VV when there is no trailer connected indicates that there is a short somewhere on the brake output circuit. I would check all the connections you made on the blue wire from the controller and then also check the trailer connector at the rear of the vehicle looking for any exposed wire or corrosion and fix as necessary. If it only flashes O.L. when the trailer is connected the problem is the same as above but...
    view full answer...
  • Will Curt Discovery Brake Controller Work With a 2003 Cadillac Escalade?
    The Curt Discovery Trailer Brake Controller, # C84VV, is a fit on your 2003 Cadillac Escalade, though it will require the use of the Curt Custom Wiring Adapter, # C51352. This product simply plugs into the port that is located in the junction box that is under your dash to the left of your steering column. The exact spot it plugs in will be on the top row, second slot from the left.
    view full answer...
  • Compatibility of Curt Discovery Brake Controller With 2010 Chevy Silverado
    Brake controllers are not vehicle specific. The # C84VV Curt Discovery brake controller is compatible with your 2010 Silverado. You'll also need the Universal Curt Brake Controller Pigtail, part # C51515. The pigtail wire will connect directly to the tow package wiring located under the dash between the steering column and the emergency brake pedal. Look for a bundle of wires with a white tag hanging from it. The wires of the pigtail will connect to the tow package wiring as follows: Red...
    view full answer...
  • Curt Discovery Brake Controller Displays Decimal Point When Not Connected To Trailer
    The Curt Discovery Trailer Brake Controller - 1 to 4 Axles - Time Delayed, # C84VV, is working properly. It is designed to display the decimal when no trailer is connected and number when connected. The numbers should increase as you activate your manual override when connected to the trailer as well. I have attached the installation details for you and a video to help.
    view full answer...
  • Tapping Into Brake Light Circuit to Install Brake Controller In a 2011 Chevy Equinox
    On a 2011 Chevy Equinox you cannot tap into the brake light switch to install a brake controller. You have to get the signal from the BCM (body control module). It is located up under the dash to the left of the brake pedal. There is a 26-pin connector. You need the wire in position 11. It should be a white wire. I have included a picture that should help. I have also included a link to another answer page to the right that also has that picture.
    view full answer...
    Image 1 for
  • Brake Controller Wiring Harness for Curt Discovery in 2017 Chevrolet Colorado
    Brake controllers are not vehicle specific technically the Curt Discovery # C84VV will work in your 2017 Chevrolet Colorado. The # C51515 wiring harness is the correct one for the Discovery.
    view full answer...
  • Will A Curt Discovery Brake Controller Work in a 2016 Toyota 4-Runner
    Yes, your Curt Discovery Brake Controller # C84VV is compatible in 2016 Toyota 4Runner. The Curt Custom Wiring Connector # C51362 will be the connector that you will need to install the brake controller in your 4-Runner.
    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...
  • 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 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
  • Is The Curt Discovery Trailer Brake Controller Supposed To Light Up When Vehicle Is Started
    The Curt Discovery Trailer Brake Controller # C84VV is supposed to light up when you switch on the ignition or start your 2009 Chevrolet Silverado. With no trailer connected you should just see the period(.) on the screen.
    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...
  • 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...

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

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