Clutch Hydraulic System; Bleeding And Flushing - BMW 5251 Service Manual

Tool for bleeding clutch hydraulics (Tool No. 21 5 030)
2 1 5 030
I
The clutch is hydraulically actuated by the master and slave
cylinders. With the self-adjusting clutch (SAC), clutch disc
wear is automatically taken up through the self-adjusting
pressure plate springs, making pedal feel consistent through-
out the life of the clutch.
A soft or spongy feel to the clutch pedal, long pedal free-play,
or grinding noises from the gears while shifting can all indi-
cate problems with the clutch hydraulics. In these circum-
stances it is best to star? with a clutch fluid flush, followed, if
necessary, by replacement of the hydraulic parts.
NOTE-
The clutch hydraulic system shares the fluid reservoir and flu-
id with the brake hydraulic system.
Clutch hydraulic system,
bleeding and flushing
If the clutchlbralte fluid is murky or muddy, or has not been
changed within the last two years, flush the system and
change the fluid. Flushing the old fluid from the clutch lines is
done using a bralte system pressure bleeder.
-
Remove brake fluid reservoir cap. Using a clean syringe, re-
move brake fluid from reservoir. Refill reservoir with clean
DOT 4 bralte fluid.
Worlting inside engine compartment, remove left interiorven-
tilation filter housing:
Release 3 plastic taps (A) on duct. Earlier models use a
single release latch.
Rotate duct inward to remove.
Disconnect electrical harness to hood position switch.
Remove filter housing cover.
Release spring lock (B) on interior ventilation housing and
remove housing.