How to Adjust the Trailer Brake Gain of the Toyota Tundra
Here are the 8 steps as your guide on how to adjust the trailer brake gain of your Toyota Tundra. Please follow the instructions below.
Gain setting on trailer brake controller should be set for a specific towing condition. Gain setting should be adjusted each time the vehicle load, trailer load, road conditions, or weather changes. Setting the gain value to 0 will disable the trailer brake controller output.
8 STEPS
STEP 1
- Make sure the trailer brakes are in good working condition and functioning normally. See trailer dealer if necessary.
STEP 2
- Hook up the trailer and make proper electrical connections.
STEP 3
- Select the correct type of trailer brakes that are equipped on the trailer by using the multi-information display. Read Here: Change Trailer Brake Type
STEP 4
- Drive vehicle with trailer attached on a level road surface similar to towing condition and in traffic-free environment. Driving speed should be approximately 20 – 25 mph [35 – 40 km/h].
STEP 5
- Using the GAIN (+/-) selection buttons, set a starting gain of 5.0.

STEP 6
- While driving 20 – 25 mph [35 – 40 km/h], fully apply the manual TRAILER BRAKE OUTPUT slider.

STEP 7
- Adjust the gain setting, using the GAIN (+/-) selection buttons, to either increase or decrease to just below the point of trailer wheel lock-up.
STEP 8
- For confirmation, repeat STEP 6 and STEP 7 until desired gain setting is reached (just below point of trailer wheel lock-up).
That’s all the information you need to know on how to adjust gain of the trailer brake on your Toyota Tundra. Thank you very much. – Erwin C. Salarda
