Question 111.
Some tractor units don’t supply air to the trailer brakes when the parking brake is applied, so to check for air leaks in the trailer under brake pressure you need to apply some pressure to the brake pedal.
Question 111.
Some tractor units don’t supply air to the trailer brakes when the parking brake is applied, so to check for air leaks in the trailer under brake pressure you need to apply some pressure to the brake pedal.