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  1. Trailer Brake Controller
  2. CURT
  3. Electric
  4. Proportional Controller
  5. Up to 4 Axles
  6. Under-Dash
THIS ITEM IS NOT A FIT FOR
2012 Mini Countryman
CURT

Curt TriFlex NEXT Trailer Brake Controller w/ Custom Harness - 1 to 4 Axles - Proportional

Part Number: C86SV
In Stock
$135.95
Trailer Brake Controller
Not Confirmed to Fit

2012 Mini Countryman

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In Use/Installed

This compact brake controller fits nicely in your cab. It's designed to mount flush to the dash and is only 1" thick. The controls are simple, the LED display is large and bright, and the manual override is easy to reach in a pinch. Great Prices for the best trailer brake controller from CURT. Curt TriFlex NEXT Trailer Brake Controller w/ Custom Harness - 1 to 4 Axles - Proportional part number C86SV can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (927)
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  • Videos (3)
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CURT Trailer Brake Controller - C86SV

  • Electric
  • Proportional Controller
  • Up to 4 Axles
  • CURT
  • Under-Dash
  • Plug-In
  • Under-Dash Box
  • Single Trailer Only
  • LCD Display

This compact brake controller fits nicely in your cab. It's designed to mount flush to the dash and is only 1" thick. The controls are simple, the LED display is large and bright, and the manual override is easy to reach in a pinch.


Features:

  • Activates trailer brakes in proportion to your vehicle's braking
    • Automatically adjusts trailer's braking based on deceleration of tow vehicle
    • Automatically increases power when going downhill and decreases when going uphill
  • Shows you braking and sensitivity settings and error codes on a simple LED display
  • Uses rocker switches to set settings
  • Activates manual override with pinch-trigger
  • Protects your vehicle, trailer, and controller
    • Runs continuous diagnostic checks
    • Minimizes drain on car battery with sleep mode
    • Keeps trailer brakes from overheating by reducing power output during prolonged stops
    • Defends brake controller and trailer breakaway systems against shorts
    • Prevents positive and negative power reversal with built-in polarity protection
  • Mounts at any angle
    • Automatic leveling
    • Mounting bracket and hardware included
  • Plugs right in with custom-fit harness


Specs:

  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Compatible with electric trailer brakes
    • Compatible with ABS brakes, cruise control, low-voltage wiring, multiplex wiring, and PWM systems
  • Dimensions: 4" long x 3-1/8" wide x 1" tall
  • Warranty:
    • Limited lifetime on brake controller
    • Limited 1-year on wiring harness


Gain and Load Adjustment

Curt TriFlex NEXT

Gain is the maximum amount of power that will be applied to your trailer's brakes. 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. Use the gray rocker switch to adjust the gain on a scale of 0.5 to 9.9 in increments of 0.5.


Once you have the gain set, you can fine-tune your braking by adjusting the load control on a scale of 1 to 9 using the black rocker switch. This controls the aggressiveness of your trailer's braking, meaning how quickly the brakes reach the maximum braking level. If your vehicle takes too long to come to a stop, increase the setting. If it stops too abruptly, decrease the setting.


LED Display

The LED display on the TriFlex is large and easy to read at a glance. You can adjust the brightness or trigger night mode so it won't glare obnoxiously on your dash. It also will give you error messages you can use to troubleshoot.


Curt Discovery NEXT troubleshoot

Safety Features

The TriFlex offers key safety features to prevent damage to various components of your towing setup. This starts with built-in protection against shorts and positive and negative power reversal, as well as continous diagnostic checks to alert you to any potential problems as they come up. To minimize the drain on your vehicle's battery, the TriFlex will automatically go into sleep mode after 5 minutes of inactivity. Sleep mode will turn off again the moment you press the brake pedal.


Installation

Automatic leveling means 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.


The included custom-fit adapter plugs into the port that is built into the electric junction box beneath your vehicle's dash. The black box is located to the left of the steering column, just above the carpet. To plug in the adapter, first remove the cover on the box. The adapter plugs into the second slot from the left, on the top row. Once you're plugged into the factory port, just plug the other end of the adapter into the TriFlex. No hardwiring needed!


Note: If you don't already have a 7-way plug at the back of your vehicle, take a look at our exclusive 7- and 4-way brake control installation kit (ETBC7 - sold separately).


What is Proportional Braking?

What is proportional Braking

Proportional braking means that your trailer brakes mimic your tow vehicle's brakes. If you slam on the brakes in your vehicle, your trailer brakes will activate with the same intensity; if you brake lightly, your trailer brakes lightly too. The trailer's braking is in proportion to your vehicle's braking. This saves wear and tear on the tires and the brakes on both your vehicle and trailer.


The TriFlex uses an internal 3-axis accelerometer to sense how your vehicle is braking so it can send the right amount of braking power to your trailer. It measures the inertia of your tow vehicle and activates the trailer's brakes to slow at the same rate. The result is uniform braking across your towing setup. No push-pull action - just smooth, proportional braking every time.



51146 Curt Tri-Flex NEXT Proportional Trailer Brake Control

Replaces Curt 51140

51352 Curt Quick Plug Brake Control Adaptor Harness

Installation Details C86SV Installation instructionsAlternate Instructions C86SV Installation instructions


California residents: click here


Video of Curt TriFlex NEXT Trailer Brake Controller w/ Custom Harness - 1 to 4 Axles - Proportional

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for What to Know About the Curt TriFlex NEXT Trailer Brake Controller

Hi there, I'm Michael with etrailer.com. Today we're gonna take a quick look at this Curt Triflex Next Trailer Brake Controller. So if you have electric brakes or electric over hydraulic brakes, you're probably already aware that without a brake controller your trailer's brakes won't activate. So they're really not doing you any good. So you are gonna need to have a brake controller. Basically what a brake controller does is when you apply the brakes in your tow vehicle it's gonna send a signal through your brake switch to your brake controller.

The brake controller is then going to send an electrical signal out to your trailer's brakes so that they apply and help to slow down your trailer. There are several different kinds of brake controllers. There's different basic technologies and that sort of thing. Really your two main categories are you have a time delayed set up or you have a proportional setup. So with your time delay, essentially you set how much power you want applied to your brakes and then no matter if you're just tapping your brakes or really slamming on them in an emergency sort of situation, it's going to apply that same preset power each time.

So there are some downsides to that. It doesn't give you as much control. It can be a little aggressive sometimes when you don't need it to be. But then with your proportional setup it is going to apply your trailer's brakes with the same intensity as your tow vehicle's brakes. So if you're just lightly tapping on the brakes it's just going to lightly apply your trailer's brakes.

So proportional systems like this one are definitely my preference. I think they're a little bit more, give a little bit more finesse to your performance. There are some downsides to these. Typically, they are gonna be a little bit more expensive then your time delayed systems just because they do have more components to them. They've got an accelerometer in there that's going to sense the inertia of your movement so that it can apply the brakes proportionally for you.

And then another downside is typically because it does have that inertia sensor in there, or an accelerometer, it's going to have to be mounted in certain configurations to follow your direction of travel. And that's one benefit to this particular model is that it doesn't have to be mounted in any particular configuration. So you can basically mount it wherever you want. So definitely a benefit to this one over even other proportional systems. So for this model specifically, it does have the LED display that's going to show the amount of power output. You can adjust that with your rocker switches here. So very easy to access those. That's going to allow you to adjust between 10 different gain settings. So you can adjust the amount of braking power to suit your performance, the road conditions, the type of trailer you're towing, and the weight of your load. If you select a higher setting for a harder braking and a lower setting for more gradual braking, you do wanna make sure when you're getting that set up a good rule of thumb is to go just shy of where your trailer's brakes lock up. So test it out a few times. As you're going down the road you don't want your trailer's brakes to lock up. So get to that point and then come down just a little bit to get that fine tune where you need it to be. And then typically your gain is only gonna have to be readjusted when you're experiencing changing road conditions or if the weight of your trailer changes. So if you drop off your trailer load and you're needing to you probably need to adjust that gain there. It also gives you nine different load settings so that you can adjust how quickly the brakes will reach their maximum braking level. So if your vehicle takes too long to come to a stop, good idea to increase your setting by pressing the upper rocker switch. And then if it's stopping too abruptly you can decrease the settings as well. So you kind of fine tune it to your preference. We also have the pinch trigger manual override here. So that's within very easy reach, very simple to operate. What that's gonna do is allow you to apply your trailer's brakes without having to apply the brakes in your tow vehicle. So say for instance, if your trailer starts swaying you don't really need to slow down your whole setup you just need to apply the brakes in your trailer to kind of bring that back in line. So you can just push in on that trigger switch there and that will apply your brakes in your trailer without having to apply the brakes in your tow vehicle. This does have several different integrated safeguards to help protect your vehicle, the trailer, and the controller itself. It's going to run continuous diagnostic checks to alert you to any potential problems. It will help to minimize drain on your car battery by entering sleep mode. After about five minutes of inactivity it's gonna help keep your trailer's brakes from overheating by reducing power output when you're sitting for prolonged periods or prolonged stops. So if you're in traffic or something like that it's gonna help decrease the power so your brakes don't overheat. It's also going to defend the brake controller and trailer brake away system against any shorts and prevent positive and negative power reversal with its built-in polarity protection. This is gonna be very quick and easy to get installed. Again because you're not having to worry about the orientation, you can basically just get it mounted wherever it's gonna be most convenient for you to reach and access those controls. They've got this mounting bracket here. As you can see we'll just use the included hardware to get this mounted in place. And then basically our controller just slides onto that so it can be mounted flush with your dash. So very convenient to get that mounted. When you're considering where you can mount this, give you a few measurements here. You can see it is right about three we'll call it three and one eighth of an inch wide. Our length, we're right about four inches long. And our height approximately one inch overall. So keep that in mind and when you're deciding where you can get this mounted. Now as far as wiring goes, that's gonna completely depend on your setup. So there are some vehicles that already have a plug pre-installed from the factory that will allow you to just plug this right in there. If you don't have that on your vehicle, there are some kits available that will allow you to make that installation process pretty simple. But they are very vehicle specific. So I'd encourage you to use our vehicle fit guide here at etrailer.com. You'll select your year, make, and model of your vehicle. We'll let you know which products are confirmed to fit with your vehicle. So that's another route to go. If your vehicle isn't already pre-wired with a plug then I would recommend that. Otherwise, it is gonna take a little bit of doing to get this installed. If you don't already have a seven way plug at the back of your vehicle, I would highly recommend using our ETBC seven plug that's gonna provide wiring and everything to get you set up so that you've got that connection so that your trailer can connect to your vehicle. But overall, a really great option here. Like I said, I really like the proportional system. The way this is going to allow your trailer's brakes to be applied at the same intensity as your tow vehicle. I like that this model gives you that option to have more versatility and where you get it mounted. And so overall, I think this is gonna be a great way to go if you are needing a brake controller for your trailer's brakes. And that completes our look for today. Again, I'm Michael with etrailer.com. Thanks for watching.

Customer Satisfaction Score:

Ratings & Reviews

4.7

925 reviews
This compact brake controller fits nicely in your cab. It's designed to mount flush to the dash and is only 1" thick. The controls are simple, the LED display is large and bright, and the manual override is easy to reach in a pinch.

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  • Brake Controller Does Not Work After Installation on a 2005 Chevy Silverado
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    The Curt Echo Under-Dash Brake Controller # C27JR is an excellent choice for your 2005 Chevy Tahoe. I really like it because you mount it under your dash and then you have a clutter-free brake controller to use! The correct wiring kit to connect this to the tow package on your Tahoe is the Curt Adapter # C51352. This gives you a simple plug-and-play installation that takes any guesswork out of the wiring. We have a variety of other controllers to choose from but the Echo Under-Dash is...
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  • Recommended Wiring Harness For A Curt TriFlex Trailer Brake Controller In A 2003 Chevy Silverado
    The part #15085418 you referenced comes back as an OEM GM wiring harness, which you would have to go to a GM dealership to purchase. If you're just needing a wiring harness for the Curt TriFlex Trailer Brake Controller - 1 to 4 Axles - Proportional # C24VV that you linked to so you can plug it into your 2003 Chevy Silverado with factory tow package then you can use the Curt Custom Wiring Adapter for Trailer Brake Controllers - Dual Plug In # C51352. This wiring harness will plug into...
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  • Curt Trailer Brake Controller Does Not Power On when Installed on a 2007 GMC Sierra Classic
    There may actually be some additional connections that you will need to make under the hood. Take a look at the article I have linked that covers everything that you will need to do under the hood on your 2007 GMC Sierra Classic. First make sure you are plugged into the spot in the junction box in the top row, second from the left. Then make sure you have all the connections and fuses in the correct locations. It seems strange but also make sure the fuse you are using is a good fuse and...
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  • No power to New Trailer Brake Controller Install on a 2007 GMC Sierra Classic
    You will likely have to make at least one connection under the hood of your 2007 GMC Sierra Classic to power the brake controller. You may also need a fuse. I have included a link to the right that shows the connections that you will need to make under the hood to make everything fully functional.
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  • Curt TriFlex Brake Controller C24VV Does Not Show Red Dot on Display After Installation
    The Curt TriFlex Trailer Brake Controller, part # C24VV, and the matching harness for your 2007 Chevrolet Silverado Classic, part # C51352, will work with your vehicle as long as your 7-way connector on your rear bumper is not the type that includes LED test lights. Such 7-way connectors are not compatible with the Curt TriFlex. It is critical that before installing the controller the negative battery terminal be disconnected to avoid potential damage to the unit. Also, the trailer must...
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  • Troubleshooting Curt Tri-Flex # C51140 Brake Controller Installation in 2006 Chevrolet Silverado
    Thank you for your recent purchases from etrailer.com. The quick-connect brake controller adapter harness you purchased along with your brake controller, part # C51352, is the correct one for your 2006 Silverado. Brake controller installation in your truck, if it did not have a factory tow package, requires you to complete some electrical connections and install fuses in the engine compartment, at the power distribution box. Since you also ordered a 7-way, I will presume your truck did...
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  • Parts Needed To Install Curt Assure Trailer Brake Controller In 2007 Chevy Silverado 2500HD Classic
    I have another option for you, but your 2007 Chevrolet Silverado 2500HD Classic has a factory trailer brake controller port so there is no need to cut any wires. To replace your current controller with the Curt Assure Trailer Brake Controller with Dynamic Screen - 1 to 4 Axles - Proportional # C49UR you will just need the # C51352 which will plug into the factory trailer brake controller port underneath the dash of your truck. I included video reviews for both of the products mentioned...
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  • Parts Needed to Install a Trailer Brake Controller on a 1997 Chevrolet C/K Series Pickup
    A brake controller wiring harness is not available for the 1997 Chevy K 1500 pickup. You will need to hardwire in a brake controller using 3 parts: a brake controller, a 4 and 7 way installation kit, and a 4-Way trailer wiring harness. If your truck already has a 4-Way trailer connector then you will not need to add one. But if it does not have any trailer wiring you will need to first install # 118315. I have linked installation instructions for you. Next you will need a 4 and 7 way...
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  • Install Harness for 2005 Chevy Tahoe for Curt Spectrum Brake Controller
    Yes the correct brake controller install harness for your 2005 Chevy Tahoe is the part # C51352 to install the Curt Spectrum # C51170 that you mentioned.
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  • Can Curt TriFlex Trailer Brake Controller # C24VV Be Temporarily Disabled When Backing Up
    I did some research on this controller for your 2006 Chevrolet Silverado, and there are no features available that will turn the Curt TriFlex Brake Controller, part # C24VV off. The best way to temporarily disable the controller when you intend to back up is to unplug the trailer. If you were to unplug the controller, it would have to be reset when it is plugged back in. I spoke with my contact at Curt and they strongly advised against doing this because if someone failed to reconnect the...
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  • Will a Brake Controller Install and Work Fine on a Truck with an ABS Brake Light On
    A brake controller like the Curt Venturer part # C74VV does not tie into the actual braking system of a truck like your 2004 Chevy Silverado so it would still work fine. As long as your brake lights are functioning properly on your truck a brake controller will function just fine since that is the only circuit it has to use to operate. To install this controller in your truck like the one you referenced all you would need is the correct install harness, part # C51352. I attached an install...
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  • Troubleshooting Brake Controller Installation On 2003 GMC 3500
    When checking the brake output circuit of a 7-Way there should not be 12 volts of power all the time. A Curt brake controller will have what is termed 'dead' voltage at idle. This means there is voltage but no amperage draw. You can test for amperage instead of voltage to see if that is the case. If so, then you do not have a problem. If you are showing amperage draw that would indicate a short somewhere or possibly a problem with the brake controller. For a Curt brake controller, and if...
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  • Wiring Adapter Needed for Curt Reflex Trailer Brake Controller # C51130 on 2005 Chevrolet Silverado
    The wiring adapter needed to install the Curt Reflex trailer brake controller on your 2005 Chevrolet Z-71 Silverado is part # C51352. No cutting or splicing is required. Just plug the one end into the brake controller and the other end into the junction box under the dash. I have attached the installation instructions for you.
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  • What Brake Controller Adapter for Curt Brake Controller on 2004 Chevy Silverado
    The correct brake controller adapter to use with your Curt Venturer Brake Controller # C74VV will be part # C51352, which will plug into the factory brake controller port. I've linked a installation video of this controller using the adapter for you to have a look at, as well.
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  • Most Economical Way to Add 7-Way & Brake Controller to 2003 Chevy Silverado 1500
    Hi Michael, What you'll need to do to add a 7-way to your 2003 Chevy Silverado 1500 is hardwire the Pollak 7-Pole, RV-Style Trailer Connector Socket w/ Wiring Harness and Mounting Bracket # PK11898. Since you don't have a factory 7-way, the wires to attach to this harness will be above the spare tire, and splice them. I have added a link below to a help article which shows you exactly what to do and where the wires are on your truck. And while 7-way doesn't come with a 4-way socket,...
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  • Parts Needed to Convert From Hydraulic Drum to Electric Over Hydraulic on 2005 GMC Sierra 2500
    We can get you everything you need to go from hydraulic drum brakes to an electric over hydraulic set up for your trailer and 2005 GMC Sierra 2500. You'll need an EOH actuator, breakaway kit, and brake controller that is compatible with an EOH set up. First, for the actuator and breakaway kit you'll need the following: - Dexter DX Series Electric Over Hydraulic Brake Actuator for Drum Brakes # K71-650 - Bright Way Push-to-Test Trailer Breakaway Kit # 3802311 Then for the brake controller...
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  • Does Curt TriFlex NEXT Brake Controller C68SV Come With Connector For 2005 Chevy Avalanche
    Hey Gene, It sure does; both the brake controller and the wiring adapter for your 2005 Chevy Avalanche are included with the Curt TriFlex NEXT Trailer Brake Controller w/ Custom Harness # C86SV. This will be right for your truck so long as you have the factory 7-way, as the adapter will plug right into the port under the dash on your Avalanche.
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Wilson B
Updated by:
Wilson B
Employee Amanda K
Updated by:
Amanda K
Employee Sabrina W
Written by:
Sabrina W

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