Trailer brakes utilize principles of electricity, pneumatics, and hydraulics. When the trailer is moving, the brake control system detects the movement of the trailer tires via electronic signals and controls the electromagnets of the brakes, causing the brake pads to contact the tire surface. Friction then slows the trailer. When the brake pedal is released, the brake pads automatically leave the tire surface, restoring the trailer's speed.
A trailer brake is a device used to slow down or stop a trailer carrying a heavy load. Typically, a trailer brake consists of a brake control system, a hydraulic system, and the brake itself.

