308-02-32 Clutch Controls 308-02-32
DESCRIPTION AND OPERATION
E1148 EN 07/2001
Clutch Controls
The brake fluid reservoir with separate chamber
is used to supply the system.
Depressing the clutch pedal builds up pressure in
the clutch master cylinder and operates the
release bearing integrated in the clutch slave
cylinder.
The clutch operation system is self-ventilating.
The components are arranged in such a way that
small amounts of air trapped in the system are
removed automatically.
The clutch pedal operation is affected by damage
in that greater pedal effort is required. The pedal
also returns to its starting position very slowly.
The advantages of a hydraulic clutch are:
• automatic adjustment
• low operating force required
• low wear
Reservoir
The brake fluid reservoir supplies both the
hydraulic clutch system and the brake system
with brake fluid.
The hydraulic clutch system and the brake
system are separate inside the brake fluid
reservoir. In the event of any leaks in the
hydraulic clutch system the brake system
remains fully operative.
Clutch Master Cylinder
The clutch master cylinder generates the system
pressure for operating the clutch.
If the clutch pedal is pushed down the piston rod
moves the clutch master cylinder piston. The
hydraulic fluid in the clutch master cylinder is put
under pressure and fed through the pressure
pipe to the clutch slave cylinder.
Slave Cylinder - Clutch
The central clutch slave cylinder is equipped with
an integral release bearing and is attached to the
clutch bell housing with three bolts. The release
bearing is an interference fit on the clutch slave
cylinder.
The hydraulic fluid displaced by the piston in the
clutch master cylinder moves the piston in the
clutch slave cylinder; this piston then moves the
release bearing in an axial direction. The release
bearing presses against the tongues of the
diaphragm spring with the inner bearing ring. This
breaks the friction contact between the clutch
disc and the flywheel.
When the clutch pedal is released the diaphragm
spring presses the piston in the slave cylinder
back to its starting position. The spring induced
adherence between the clutch disc and the
flywheel is created again.
Pre-load valve
The pre-load is produced by a spring.
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