Parking Brake System: Description and Operation

DESCRIPTION





Handbrake Component Layout

General

The hand brake consists of a drum brake, installed on the rear of the transfer box, operated by a cable connected to a hand brake lever between the front seats.

Handbrake Lever

The hand brake lever is mounted on a base plate which attaches to the transmission tunnel. A conventional ratchet and thumb operated release button are incorporated for locking and unlocking the lever. A warning switch on the base of the lever operates the brake warning lamp in the instrument pack. While the hand brake is applied the warning switch connects an earth to the instrument pack which, if the ignition is on, illuminates the brake warning lamp. In some markets, the instrument pack performs a bulb check of the brake warning lamp each time the ignition is switched on.

Cable

The hand brake cable consists of inner and outer cables installed between the hand brake lever and the drum brake. A protective sleeve is installed on the cable to protect the cable from heat from the exhaust system. Handbrake adjustment is provided by a threaded sleeve installed on the outer cable where it locates in the hand brake lever. Turning an adjuster wheel, which is keyed to the threaded sleeve and secured by a 'C' clip, alters the effective length of the outer sleeve and consequently changes the hand brake lever movement needed to apply the drum brake.





Drum Brake

The drum brake consists of a backplate attached to the transfer box casing and a drum attached to the transfer box rear output shaft. When the hand brake lever is applied, the movement is transmitted by the inner cable to a lever on one of the brake shoes on the backplate. The lever pivots against the brake adjuster rod, which forces the shoes apart and into contact with the drum. Brake shoe to drum clearance is set by an adjusting bolt on the rear of the backplate.