| 摘要 |
A trailer brake system includes a disc brake assembly for each wheel including apparatus to provide release of the brake pads from engagement with the rotor upon backing. In the preferred braking system, one master brake assembly is provided for braking one wheel and a slave brake assembly for braking a second wheel of the trailer; a self-contained hydraulic device being provided for moving the pads into and out of engagement with the rotor. Each brake assembly includes a stationary bracket for attachment to the axle and a caliper unit with the brake pads mounted by a single pivot pin on the bracket. A relief valve is engaged by the pivoting caliper unit to provide the release of the brake pads. The housing of the caliper unit is in two sections and mounted adjacent the top of the rotor. The bracket includes a support ring for direct mounting on the axle and an integral yoke above the ring; one arm of the yoke limiting the pivoting movement of the caliper unit in one direction by a fixed stop for forward movement/normal braking of the trailer, and the other arm supporting an actuators stop for the relief valve engaged by pivoting in the opposite direction. A spring constantly urges the caliper unit toward the fixed stop.
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