bing tracking image
  1. Trailer Brake Controller
  2. CURT
  3. Proportional Controller
  4. Up to 4 Axles
  5. OLED Display
Curt Assure Trailer Brake Controller with Adjustable Screen - 1 to 4 Axles - Proportional

Curt Assure Trailer Brake Controller with Adjustable Screen - 1 to 4 Axles - Proportional

Item # C49UR
Our Price: $199.95
You Save: $136.47
Trailer Brake Controller
Shipping Weight: 0.54 lbs
Add to cart
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
This sleek, low-profile proportional brake controller will fit easily into your cab. A large, high-quality OLED screen with full-text readouts is easy to see. Includes 9 sensitivity settings and built-in safety features. Great Prices for the best trailer brake controller from CURT. Curt Assure Trailer Brake Controller with Adjustable Screen - 1 to 4 Axles - Proportional part number C49UR can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (44)
  • Q & A (0)
  • Photos

CURT Trailer Brake Controller - C49UR

  • Proportional Controller
  • Up to 4 Axles
  • CURT
  • OLED Display

This sleek, low-profile proportional brake controller will fit easily into your cab. A large, high-quality OLED screen with full-text readouts is easy to see. Includes 9 sensitivity settings and built-in safety features.


  • Brake controller activates trailer brakes in proportion to your vehicle's braking action
    • Automatically adjusts trailer's braking based on deceleration of tow vehicle
  • High-quality, 1-1/2" tall, OLED screen displays full-text readouts and tilts so it's easy to see
  • Large, tactile buttons keep your settings within easy reach
    • 9 Levels of boost let you adjust initial braking power and aggressiveness for smooth, safe braking
  • Pressure-sensitive manual override button lets you control trailer sway or stop in emergencies
  • Dynamic power adjustment intuitively gives you the braking output you need
    • Automatically increases power for going downhill and decreases for going uphill
  • Integrated safeguards protect your vehicle, the trailer, and the controller
    • Runs continuous diagnostic checks to alert you to any potential problems
    • Minimizes drain on car battery by entering power conservation mode after 30 minutes of inactivity
    • 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
  • Compatible with ABS brakes, cruise control, low-voltage wiring, multiplex wiring, and PWM systems
  • Sleek, low-profile design makes it easy to tuck the brake controller out of your way
    • 90-Degree vertical mounting range
    • Mounting bracket and hardware included
    • Plug-in, vehicle-specific brake control adapter (sold separately) can be used to reduce installation time on certain vehicles


  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Compatible with electric or electric-over-hydraulic trailer brakes
  • Dimensions: 3-7/8" long x 3-1/2" wide x 3/4" tall
    • Height of OLED display: 1-1/2"
  • Mounting range:
    • 90 Degrees vertically
    • 20 Degrees horizontally
  • Limited lifetime warranty

Adjustable, Easy to Read OLED Display

Curt Assure OLED Display

The high-quality OLED display on this brake controller makes the screen easy to read at a glance. The text is large and you can tilt the screen to the angle that makes it easy for you to see. Instead of displaying codes that you have to look up, this display shows full-text descriptions of errors so you can quickly address any problems that come up.

Built-In Controls for Adjustable Power

Curt Assure braking output
Braking Output: Braking output 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. Use the + and - buttons to set the output. You want to set the braking output as high as you can without locking up the brakes. Once you've set up the brake controller the first time, you shouldn't need to adjust this setting unless the trailer load changes, you switch trailers, or road conditions change. The OLED display will show the current output setting being used.

Sensitivity: Once you have the output set, you can fine-tune the power by adjusting the sensitivity of the internal sensor. This controls the aggressiveness of your trailer's braking, meaning how quickly the brakes reach the set output level. You can adjust this when you're towing heavy loads and you need more umph to bring your trailer to a stop. Your tow vehicle doesn't need that much power to brake in time, but your heavy trailer does. The sensitivity setting gets the braking power to your trailer brakes faster and with more intensity so that it doesn't push your tow vehicle forward.

There are 9 sensitivity levels (boost levels), with 1 being the least sensitive. At level 9, the sensitivity of the internal sensor is as high as it can go. Press both buttons at once to switch into the sensitivity mode and adjust to the level you need for smooth, safe braking. When you change the setting, the display on the Assure will flash the level before reverting back to showing the power output.

Curt Assure braking output
Manual Control: The manual override button on the Curt Assure is pressure sensitive for precise braking power. When you press the button, the trailer's brakes will be activated with the same amount of force, without activating the brakes on your tow vehicle. This is great for stopping sway or controlling your trailer's momentum in emergencies. The braking intensity will be indicated on the OLED display when you press this button.

Safety Features

The Assure 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 controller will automatically go into power-saving mode when not in use. This feature will turn on after 30 minutes of inactivity and turn off again the moment you press the brake pedal.

Another great way that the Assure protects the longevity of your setup is a hold feature that saves wear on your brakes. When you're waiting at a red light, you don't need your trailer brakes on at full power. The longer you sit there, the more they will overheat. But with the Assure, any time your tow vehicle and trailer are at a standstill for a prolonged period of time, the controller will reduce the power output to the brakes. This will keep your trailer in place while saving your brakes.

Automatic Leveling and Simple Installation

The self-leveling feature of the Assure ensures that the brake controller continues to function even as you drive up steep hills or through the mountains. Simply mount it in your cab at a vertical angle within 90 degrees, and the controller will level itself automatically. This makes the installation that much easier. But keep in mind that the Assure must be horizontally level and parallel with the direction of travel to work correctly.

Curt Assure Trailer Brake Controller Mounting and Installation

Installation is a snap. 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.

Installation Accessories

See also'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.

Note: If a custom brake control wiring adapter is not available for your vehicle, either a 20-amp or 30-amp circuit breaker (sold separately) may be required for installation.

Proportional Braking

What is proportional Braking

The Curt Assure brake controller comes equipped with proportional braking to give you the best towing experience. 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 Assure uses an internal inertia sensor to detect 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.

51160 Curt Assure Proportional Trailer Brake Control with Dynamic Screen

Installation Details C49UR Installation instructions

Customer Satisfaction Score:

Customer Reviews

Curt Assure Trailer Brake Controller with Adjustable Screen - 1 to 4 Axles - Proportional - C49UR

Average Customer Rating:  4.7 out of 5 stars   (43 Customer Reviews)

This sleek, low-profile proportional brake controller will fit easily into your cab. A large, high-quality OLED screen with full-text readouts is easy to see. Includes 9 sensitivity settings and built-in safety features.


The resources at made my purchase easy. By having specific truck lookup ,correct wite adapter and specific product videos. Looking forward to my first trip with curt assure brake controller.


2006 Dodge Ram. Easy install. Plug it in and tie up the wires. I put a wire protector sleeve to cover the wires coming out of the controller.


Good prices and selection but the shipping was pretty slow. Almost had to go buy a cheap brake controller to get my towing job done. I'd buy from etrailer again without hesitation assuming I didn't need it right away.


Great customer service
Quality parts
with excellent communication


VERY easy install. As mentioned in other reviews the hardest part is finding the factory plug in for a 2017 Tacoma. Toyota tucked it way in the back behind a wire bundle. Picture attached for reference.


Controller worked great. Stops smoothly and properly. The only problem is when I disconnect the trailer the display continues to say there’s a problem and won’t stop until I unplug it. Called technical for help and he said there’s a short somewhere but I haven’t found any short or cause.


Qaulity product and easy installation. Fast shipping.


Noah A did a fantastic job of making sure I had the right product and referred me to their video library for installation instructions. Absolutely a fantastic representative of this company 5 out of 5 stars for sure. Good follow up as well!


Awesome company. Install was simple and delivery was as fast as I ever had. Highly recommended them.


The product worked great, but I am annoyed because etrailer wouldn't take it back even though I hadn't used it.


Fast Shipping! Works great!!


Much smoother braking than my previous controller that the RV dealer put in. Curt has excellent customer service.


Customer service is awesome needed this to pickup my trailer tomarrow they were able to get it to me next day. Also ygis trailer brake literally plug n play on 2003 chevy suburban.


Good product


easy to install, but needed correct cable for tundra works just fine with large trailer


The directions on this item are horrible. I finally figured it out and was able to install it onto my Ram 1500, but only after spending hours trying to make everything fit right. If you're looking for a hitch setup to pull a trailer long distances, I would advise you to look at other options. This will work for my short trips with my half-ton pickup, but I would not want to pull anything more than 50 miles with this setup.


Great company to work with!


Brake controller came in less than 48 hours! Looks great, going to hook it up today! Thanks Etrailer


Easy to install in my 2021 Toyota Tacoma. Make sure to order separate connector. The white connection is behind the foot rest left of the brake. Easy to find, installed in about 20 minutes.


Was easy to order and order was delivered quickly while a staff member always stayed in contact with me giving me updates on my order


Install video and instructions on my 2007 Toyota Tacoma where very helpful, thank you for the kit!


Package was delivered on time and in great condition.


hayley was very helpfull


Great product! Staff very helpful!


Customer service is off the charts awesome job !!!!!

Show More Reviews

See what our Experts say about this CURT Trailer Brake Controller

Do you have a question about this Trailer Brake Controller?

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Written by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Chris R
Video Edited:
Chris R
Employee Jonathan Y
Video Edited:
Jonathan Y
Employee Wilson B
Updated by:
Wilson B
Employee Eric H
Updated by:
Eric H
Employee Amanda K
Updated by:
Amanda K
Employee Ryan G
Test Fit:
Ryan G
Employee Clayton O
Test Fit:
Clayton O

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.