Electric Park Brake Control Module (EPBCM)

The EPBCM monitors external and internal inputs and adjusts the tension of the brake cables to operate the drum brakes and provide the required parking brake function.

The EPBCM is installed on a support bracket attached to the front of the spare wheel carrier. Two rubber mounts, installed on lugs on the underside of the EPBCM, locate in holes in the support bracket. The top corners of the EPBCM are secured to the support bracket with rubber mounts and flanged nuts.

The main components of the EPBCM are:

• A PCB (printed circuit board) incorporating the ASIC (application specific integrated circuit) for control of the parking brake.
• An electric motor.
• A gearbox.
• A spline shaft.
• A force sensor.

The spline shaft and the force sensor are connected together by a latch on the end of the spline shaft. The spline shaft rotates on the latch and moves axially in the gearbox. The latch and the force sensor slide in a channel in the body of the EPBCM.

To apply or release the drum brakes, the EPBCM runs the electric motor, which drives the gearbox. The gearbox turns the spline shaft to increase or decrease the tension in the brake cables. The EPBCM monitors the load exerted by the brake cables using the input from the force sensor.