CURT TriFlex Brake Control #51140

UPC: 612314511402

Where To Buy

MSRP $113.66

  • Triple-axis, motion-sensing accelerometer for highly responsive, smooth stops
  • Third axis provides dynamic power adjustments when going up or down a hill
  • Nine levels of sensitivity adjustment for varying loads or driving conditions
  • User-selectable power output and trailer brake light activation
  • Automatic leveling and calibration eliminate setup requirements
  • Digital display shows power adjustments in 0.1 increments
  • Built-in reverse-polarity and short-circuit protection
  • Tow vehicle ''low voltage'' and trailer disconnect indicators
  • Compatible with low voltage or pulse width modulation (PWM) systems
  • Mounts at various angles, above or below the dash, to increase usability
  • Auto sleep mode prevents battery drain after five minutes of idle time
  • Equipped with a quick plug for fast, easy installation
  • Backed by a limited lifetime warranty


  • Includes mounting hardware
Primary Video
Instruction Sheet Download pdf
Installation Video
UPC 612314511402
Part Type Brake Control Unit
Shipping Weight 0.550
Axles 1-4
Activation Inertia accelerometer
Display Digital
Mount Angles Various
Level Adjust Auto
Warranty Limited lifetime

Additional Information

It takes a lot of power to stop a moving trailer, especially when that trailer is hauling a heavy load. On RVs, flatbeds, livestock trailers and many other oversize haulers, manufacturers typically install trailer brakes to assist the tow vehicle in bringing such a massive amount of weight to a halt. But it takes more than a good set of brakes to make quick, efficient stops. It takes precision and the right amount of control.

The crown jewel of CURT''s brake control lineup is the TriFlex™. This proportion-based brake control features a compact size, a digital display and the ability to manage up to eight brakes at a time. The feature that sets the TriFlex™ apart from all others is its triple-axis motion-sensing accelerometer. This integrated circuit component allows the TriFlex™ to detect every motion of your vehicle and trailer with exact precision and to then apply the perfect amount of braking power for every situation. The TriFlex™ also automatically adjusts brake output when going up or down a hill and is compatible with anti-lock brakes and cruise control. It comes with a mounting bracket and hardware and can be mounted at various angles on your vehicle''s dash. Best of all, like other CURT brake controls, the TriFlex™ is protected by a limited lifetime warranty.

All CURT brake controls are designed to work with quick plugs so that they can readily plug into your vehicle''s original equipment socket. They also include a mounting bracket and hardware for easy installation. A brake controller should be mounted somewhere on the dash of your vehicle, and we recommend putting it below the steering wheel, either on the right or left side of the steering column. This way the control will not block your view when driving, but it will remain accessible and visible when adjustment is needed.


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Great controller and customer service

I've been using the TriFlex controller for over 4 years without a problem. I recently experienced a problem with the sensitivity slider adjustment on the controller. Without hesitation, Curt customer service offered to send me a replacement unit along with a postage paid label to return my current controller. That was totally unexpected and further strengthens my opinion of an already great product.

51140 Brake Cont. Cust Svc

I was very impressed with the customer service I was given by Mike at the technical support 800#. I was connected to a live person within a minute of calling and Mike was very helpful and knowledgeable about the 51140 brake controller we had installed in our vehicle. Also, the solution he gave me worked and I was able to get our unit working again after an error message had caused it to stop working. The fix was quick and easy. Very nice customer support!!

51140 Brake Controller

I highly recommend Curt trailer brake controllers as I had an issue with my original 51140 controller becoming defective after about a year in service - I called customer support and was immediately sent out another controller no charge and it was delivered to my door within 5 days - This is what I call a company that stands behind it's products! It's actually quite refreshing to deal with a company like Curt because all to often you have to fight with a company to get a product repaired and or replaced. Well done Curt! I will make sure I let others know about these brake controllers and my experience with their customer service - they are truly second to none! Thanks again Mike Wazonek Owen Sound, Ontario, Canada

Nice compact unit

I have never seen a brake control that is so small and easy to use. CURT is the best!


Installation Video

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