Brake Cables

The brake cables consist of bowden cables installed between the EPBCM and the drum brakes. Nuts, on the ends of the outer cables, secure the brake cables to the EPBCM and the backplate of the related drum brake. In each drum brake, the inner cable is located in the guide spring and connected to the brake shoe operating lever by a nipple on the end of the cable. In the EPBCM, the two inner cables are joined together via the force sensor and the spline shaft.

The inner cable of the right brake cable is connected to a nipple on the force sensor by a 'shoe' on the end of the cable; a locking cover keeps the shoe engaged with the nipple.

The inner cable of the left brake cable is connected to the spline shaft by a threaded connector (left thread); a squared flange at the end of the threaded connector locates in the housing of the EPBCM, to prevent the threaded connector from turning with the spline shaft.

When the spline shaft turns, the threaded connector of the left brake cable is screwed into or out of the spline shaft, which changes the effective length of the inner cables and operates the drum brakes. The ability of the spline shaft to move axially in the gearbox equalizes the load applied by the inner cables to the two drum brakes.

Prior to disconnecting a brake cable, power should be disconnected from the EPBCM. Operation of the EPB switch while a brake cable is disconnected can cause the actuating mechanism in the EPBCM to seize. In addition, the EPB may not switch off until 20 minutes after the ignition is turned off. Automatic re-apply cannot be eliminated until this period has expired.