What should trailer brake gain be set at Ford?
For Ford trucks and SUVs equipped with the factory integrated trailer brake controller (iBC), the gain setting controls how aggressively the trailer’s brakes engage relative to the tow vehicle. A practical starting point is roughly 5 on the 0–10 scale, with adjustments up or down based on trailer weight and stopping feel.
What the Ford integrated trailer brake controller does
The iBC senses pedal braking and applies power to the trailer’s electric brakes. The gain knob scales that response: a higher gain applies more trailer braking for the same pedal input, helping heavier trailers decelerate in step with the tow vehicle. Settings vary by trailer load and road conditions, so dialing in the value is part of normal setup.
Starting points by trailer type
Use these ranges as starting points for common trailer setups. Real-world results depend on trailer weight, brake condition, road surface, and load distribution.
- Light-duty trailers (single-axle utility or small trailers): 3–5
- Standard cargo or car trailers (mid-weight, one axle or light two-axle): 4–6
- Two-axle or heavier trailers (larger campers, gooseneck adapters on compatible rigs): 5–7
- Very heavy or long trailers (high inertia, multiple axles): 6–9
Concluding: Start with a mid-range gain and adjust based on how the trailer stops alongside the tow vehicle, aiming for synchronized braking without wheel lock or trailer push.
How to test and adjust the gain
To dial in the gain precisely, follow these steps and test in a safe, controlled environment before hitting the road.
- Set the gain to a mid-range value (around 5 on the 0–10 scale) and ensure the trailer brake lights come on with the vehicle brakes.
- Drive in a straight line at a moderate speed and perform a controlled stop. Note whether the trailer starts braking too late, stops too abruptly, or seems out of sync with the tow vehicle.
- If the trailer appears under-braked, increase the gain by 1 unit and retest. If it brakes too hard or causes wheel lock, reduce by 1 unit and retest.
- Repeat in small increments until you achieve smooth, proportional braking with no trailer sway and no wheel lock on dry pavement. Recheck under wet conditions as needed.
Concluding: The best gain is the one that gives predictable, even braking for your specific trailer and load, with the trailer stopping in step with the truck.
Safety, maintenance and notes
Always verify that both vehicle and trailer brakes are functioning, the breakaway battery is connected, and trailer electrical connections are clean and secure. If you tow very irregular loads or a gooseneck trailer, consult the owner's manual or a Ford dealer for model-specific guidance, as some configurations may have slightly different procedures or maximum safe gains.
Summary
In Ford vehicles equipped with the factory trailer brake controller, start with a gain near 5 on a 0–10 scale and adjust based on trailer weight and braking feel. Use the guidelines above as a starting point and test in a safe area to achieve smooth, synchronized braking between tow vehicle and trailer.
What happens if trailer gain is too high?
If a trailer's brake gain is too high, the trailer's brakes will lock up, cause a jarring or jerky stop, or make the trailer's brakes engage too aggressively, dragging the tow vehicle and potentially causing tire damage. This can lead to unsafe driving conditions and reduce the lifespan of brake parts.
This video explains how to adjust the trailer brake controller: 57setrailerYouTube · Apr 10, 2023
Signs of a gain that is too high
- Brake lockup: The trailer wheels lock and skid when you brake.
- Jerking or grabbing: The stop feels harsh and choppy, with the trailer's brakes grabbing the vehicle abruptly.
- Trailer dragging: You feel the trailer pulling back on the tow vehicle even when it's not braking hard.
- Damage to brake parts: Overly aggressive braking can prematurely wear out brake pads, shoes, and other components on the trailer.
How to adjust the gain
- Start low: Begin with a lower gain setting, especially when the trailer is empty.
- Increase slowly: Increase the gain gradually until you can feel a slight, smooth braking force from the trailer.
- Test and re-evaluate: Test the braking at various speeds (20-40 mph) to ensure the trailer and tow vehicle are slowing down in unison without jerking.
- Adjust for conditions: You will need to adjust the gain based on load weight and road conditions. Increase the gain for heavier loads and decrease it for slippery surfaces to prevent lockup.
What is the best setting for elecbrakes?
The optimal forward setting is when the tow vehicle and trailer brake as one. Experiment with small changes until you are happy with the feel of the forward brake response. To set the minimum response: Drive slowly, approximately 20km/h, and apply the brakes as lightly as you can.
What should your trailer brake gain be set at?
Your trailer brake gain should be adjusted based on the load, starting with a lower setting and increasing it gradually until you feel firm braking without the trailer wheels locking up. A good starting point is around 3.03.03.0 to 5.05.05.0 for lighter loads, and up to 6.06.06.0 to 7.57.57.5 for heavier loads, but the exact setting depends on your specific setup.
How to adjust your gain
- Find a safe, empty area: to test your brakes on a dry, level surface.
- Start at a moderate speed: of around 202020 to 252525 mph.
- Press the manual control lever: to activate the trailer brakes.
- Increase the gain: incrementally (0.50.50.5 at a time).
- Check for lock-up: or squealing tires, which indicates you have too much gain. If this happens, decrease the gain by one full setting and re-test.
- Check for no braking: or the trailer pushing the vehicle, which indicates too little gain. Increase the gain and re-test.
- Find the sweet spot: where you feel strong, stable braking that feels balanced between the tow vehicle and trailer, but without lock-up.
Important considerations
- Adjust for load: The gain setting is not a "set it and forget it" value. You will need to adjust it when your trailer's load changes.
- Understand your controller: Some controllers have a range of 000-101010 with 0.50.50.5 increments, while others may show a range of 101010-100100100 with 555 increments. A higher number means more braking power.
- Consult your owner's manual: Always refer to your specific vehicle's and trailer's manuals for any specific instructions or warnings.
