Enter your Vehicle Towing Capacity and Actual Trailer Weight (Loaded) into this Trailer Brake Controller Gain Calculator, and it'll work out your Recommended Gain Setting along with your Towing Capacity Utilization and Estimated Brake Force Required — so you're not guessing when you dial in your controller before hitting the road.
Recommended Gain Setting
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Towing Capacity Utilization
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Estimated Brake Force Required
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Trailer brake controller gain determines how much braking force is applied to your trailer's electric brakes. Proper gain setting ensures your trailer brakes proportionally with your vehicle, preventing jackknifing, premature brake wear, and maintaining control during stops.
Start with the calculated percentage as your baseline, then fine-tune through testing. Begin at a lower setting and gradually increase until you achieve smooth, proportional braking without wheel lockup or insufficient braking force.
Yes, you should adjust your gain setting whenever your trailer load changes significantly. A heavier load requires higher gain for adequate braking, while a lighter load needs lower gain to prevent wheel lockup.
Too high: trailer brakes lock up, causing tire wear and loss of control. Too low: insufficient trailer braking, longer stopping distances, and excessive wear on your vehicle's brakes. Both scenarios are unsafe.
Perform a controlled test at low speeds in a safe area. The trailer should brake smoothly without locking up or pushing the tow vehicle. Your vehicle and trailer should stop together as one unit.
Yes, wet or icy conditions may require lower gain settings to prevent wheel lockup. Always test your braking in a safe area when conditions change and adjust accordingly.
Check your gain setting whenever you change trailers, significantly alter your load, or notice changes in braking performance. Regular testing ensures optimal safety and brake system longevity.