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What is the difference between proportional and time-delayed trailer brake controllers?

Proportional controllers use internal accelerometers to sense how quickly your tow vehicle is slowing down, delivering an identical proportion of braking power to the trailer immediately. Time-delayed controllers send an initial voltage burst when the brake pedal is pressed and ramp up to full power based on a set timer, regardless of deceleration intensity.

How do I set the gain on my trailer brake controller?

Drive on a dry, level surface at 20 to 25 mph. Without touching the truck brake pedal, pull the controller's manual slide lever completely. If the trailer tires lock up and skid, lower the gain. If the trailer fails to slow the truck firmly, increase the gain. The ideal gain setting is just below the point of wheel lockup.

Do I need to adjust the brake controller when the trailer is empty vs. loaded?

Yes. An empty trailer has significantly less tire traction and weight, meaning high gain settings will cause the wheels to lock up, flat-spotting tires. You must lower the gain when hauling empty and increase it once the trailer is loaded with cargo.

Why does my trailer brake controller show 'NC' or 'No Connection'?

'NC' indicates that the controller does not detect an electrical circuit through the trailer brake magnets. Common causes include a loose 7-way plug, dirty or corroded connector terminals, a broken blue brake feed wire, or a severed ground wire on the trailer tongue.

What does the boost button on a brake controller do?

The boost function pre-loads initial voltage to the trailer brakes the moment you touch the pedal. It does not increase maximum output, but increases the aggressiveness of the initial braking ramp, which is ideal when towing trailers that weigh as much as or more than the tow vehicle.

Trailer Brake Controller Setup & Tuning Guide (2025)

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