Front Disc Brake

Front Disc Brake

COMPONENT LOCATION - NATURALLY ASPIRATED VEHICLES

NOTE:
LH (left-hand) installation shown, RH (right-hand) installation similar.









COMPONENT LOCATION - SUPERCHARGER VEHICLES

NOTE:
LH (left-hand) installation shown, RH (right-hand) installation similar.









INTRODUCTION
The front braking system features ventilated brake discs with single (naturally aspirated vehicles) or dual (SC (supercharger) vehicles) piston sliding calipers. On naturally aspirated vehicles the discs are 355 mm (13.98 in.) diameter x 32 mm (1.26 in.) thick. On SC (supercharger) vehicles the discs are 380 mm (14.96 in.) diameter x 36 mm (1.42 in.) thick.
The brake disc is manufactured from cast iron. The disc is retained on the wheel hub by two retaining washers and the wheel nuts.
Each caliper is mounted within a fixed carrier that is secured to the front wheel knuckle with two bolts. On SC (supercharger) vehicles the calipers are painted. Each outboard brake pad is installed with a pressed steel anti-rattle spring. On SC (supercharger) vehicles a badge is formed on the anti-rattle spring. The inboard brake pad of the LH (left-hand) brake incorporates a wear sensor.

NOTE:
New pad wear sensor leads need to be fitted whenever the brake pads are changed irrespective of the brake pad warning sensor being triggered.
The brake pad wear sensor is wired in series with a wear sensor on the RH (right-hand) rear brake and the instrument cluster. If the thickness of one of the brake pads connected to a wear sensor decreases to a predetermined limit, the instrument cluster illuminates the brake warning indicator.

CONTROL DIAGRAM

NOTE:
A = Hardwired









PRINCIPLES OF OPERATION
When hydraulic pressure is supplied to the caliper, the piston(s) extends to force the inner pad against the brake disc. The caliper reacts and slides along two guide pins to bring the outer pad into contact with the brake disc.
When a brake pad incorporating a brake pad wear sensor is approximately 75% worn, the brake pad wear sensor goes open circuit. When the instrument cluster detects the open circuit, it illuminates the amber LED (light emitting diode) in the brake warning indicator, displays an appropriate warning in the message center and sounds a warning chime. For additional information, refer to Instrument Cluster Description and Operation