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Universal Part
UPC: 612314044382

Spectrum Integrated Proportional Trailer Brake Controller #51170

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  • Controls all brake settings with a simple push-button rotary knob
  • Clean, dash-mounted, OEM-style user interface with 10 tri-color LEDs
  • Main module can be mounted out of sight
  • Triple-axis, motion-sensing accelerometer for highly responsive, smooth stops
  • Easily accessible manual override with the press of a button
  • Features two installation options: drill mount or surface adhesive mount
  • User-selectable power output and trailer brake light activation
  • Automatic leveling and calibration eliminate setup requirements
  • Plug-and-play install with vehicle-specific quick plug harness (sold separately)
  • Operates 2-8 trailer brakes at a time (1-4 axles)
  • Built-in reverse-polarity and short-circuit protection
  • Compatible with low-volt, PWM, ABS, cruise control and electric over hydraulic
  • Tow vehicle 'low voltage' and trailer disconnect indicators
  • Limited lifetime warranty


  • Includes mounting hardware
  • Knob outside diameter is 1.9"
  • Patent #10,960,860

Guides & Install Sheets

Product Videos

  • Product Videos Brake Control Install: CURT 51170 Spectrum™ Brake Control
  • Product Videos CURT Brake Controls Introduction
  • Product Videos CURT Spectrum™ Brake Control
  • Product Videos Spectrum™ Brake Control User's Guide


  • ActivationTri-axis inertia
  • Level AdjustAuto
  • HUB_USAD25
  • Installation Time Exact0
  • WarrantyLimited Lifetime
  • Shipping Weight0.650
  • MaterialBlank
  • Axles1 - 4 / 2 - 8
  • Mount AnglesVarious
  • DisplayTri-color LED

The CURT Spectrum trailer brake controller gives you powerful, precise braking operation in an extremely simple and subtle design inside your vehicle. It features an LED-equipped, rotary knob interface and a separate main module with an advanced accelerometer. This allows for an OE look and feel to be maintained inside the cab of your vehicle. The separated design of the Spectrum brake controller allows the main module to be mounted behind the dash of the vehicle, completely out of sight. Meanwhile, the compact, unobtrusive interface can be fully integrated into the dash with just a single hole.

The interface of the Spectrum trailer brake controller is simple but powerful. It is a single rotary knob with a push-button in the center that allows the driver to adjust brake power output. It is equipped with ten tri-color LEDs (red, blue and green) to show the automated power output of the control. There is no need for a separate display or additional controls, keeping the dash of your vehicle clean, professional and uncluttered.

Behind the Spectrum brake controller is a powerful main module with a triple-axis motion-sensing accelerometer. This advanced circuit is able to detect the inertia of the vehicle and trailer on all axes of three-dimensional space. Whatever your speed and whatever grade you are travelling on -- up or down a hill -- the Spectrum brake controller produces the exact amount of power needed for a smooth, safe stop every time. The main module can be mounted with the included mounting brackets or adhesive patch.

The Spectrum electric brake controller is a fully compatible unit, able to operate up to eight trailer brakes at a time. It can be used on vehicles with ABS brakes and cruise control, and it works with low-voltage and PWM systems.

Like most CURT trailer brake controllers, the Spectrum installs using a quick plug harness. These wiring harnesses are vehicle-specific and plug into any CURT brake controller for a custom-fit installation in the vehicle. The Spectrum also has automatic leveling and calibration features to simplify the setup process.

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6 Item(s)

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  1. 100%


    Modern, ergonomic, simple, effective

    While planning to build a medium duty commercial RV tow rig, I chose to go with the Curt spectrum brake controller instead of a conventional under the dash style controller. It was a great choice. The spectrum fit in perfectly. Its neat design blended well with the dash and color led display added a modern touch. It is easy to use and understand on the fly. It provides effective braking and easy adjustability when needed. Curt has always come through in having the perfect towing equipment option, and as usual, they didn't disappoint. They are our first choice in towing equipment.

  2. 100%


    brake controller

    Had controller installed by Cap It here in Kelowna British Columbia and was set up perfectly and reviewed with installer. Works well. Very happy with product now that I'm familiar with all the lights. Nice location of dial, nicely done.

  3. 100%


    Curt spectrum trailer brake

    I had a problem while installing the curt spectrum trailer brake C51170. I call talked to customer service and they sent me another unit. The issue I had was my fault because I broke two of the pins and I just wanted to buy another part instead they sent me another unit way above and beyond what I had expected. They really stand behind their product and customer sevice was a pleasure to work with. 5 out of 5 stars.

  4. 100%


    Excellent customer service

    Have an issue with first controller I purchased. My fault in installing unut. Called warrenty dept. they sent out a replacement, after installing correctly unit works great.

  5. 100%


    Works great!

    Works exactly as it should so far. Also looks good on the dash.

  6. 100%


    Looks Great in my Truck

    I was able to get a hold of one of these and it works and looks great in my F-150. It installed quickly and works perfectly with my trailer. I could not be happier with CURT.

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