BMW 3 (E46). Manual — part 99
210-2
Clutch Hydraulics
The clutch is hydraulically actuated by
the master and slave cylinders. Clutch
disc wear is automatically taken up
through the self adjusting pressure
plate springs, making periodic
adjustments unnecessary.
A soft or spongy feel to the clutch
pedal, long pedal free-play, or grinding
noises from the gears while shifting
can all indicate problems with the
clutch hydraulics. In these
circumstances it is best to start with a
clutch fluid flush, followed, if
necessary, by replacement of the
hydraulic parts.
Note:
The clutch hydraulic system shares the
fluid reservoir and fluid with the brake
hydraulic system.
Clutch hydraulic system,
bleeding and flushing
If the clutch/brake fluid is murky or
muddy, or has not been changed
within the last two years, the system
should be flushed. Flushing the old
fluid from the clutch lines is done using
a brake system pressure bleeder.
-
Raise and safely support vehicle.
-
Remove under transmission
splash guard if applicable.
-
Remove brake fluid reservoir cap.
Using a clean syringe, remove
brake fluid from reservoir. Refill
reservoir with clean DOT 4 brake
fluid.
![](/vehicles/kentre/xxxis/mys/kou.png)
Attach pressure brake bleeder to fluid
reservoir and pump bleeder a few times
to pressurize hydraulic fluid system.
CAUTION!
Do not exceed 2 bar (29 psi)
pressure at the fluid reservoir
when bleeding or flushing the
hydraulic system.
Brake fluid is poisonous, highly
corrosive and dangerous to the
environment. Wear safety
glasses and rubber gloves when
working with brake fluid. Do not
siphon brake fluid with your
mouth. Immediately clean away
any fluid spilled on painted
surfaces and wash with water,
as brake fluid will remove paint.
Always use new brake fluid from
a fresh, unopened container.
Brake fluid will absorb moisture
from the air. This can lead to
corrosion problems in the
hydraulic systems, and will also
lower the brake fluid's boiling
point. Dispose of brake fluid
properly.
Connect a length of hose from clutch
slave cylinder bleeder valve (arrow) to
a container.
-
Open bleeder valve and allow
brake fluid to expel until clean
fluid comes out free of air
bubbles.
-
Close bleeder valve and
disconnect pressure bleeding
equipment from fluid reservoir.
Hose on bleeder valve remains
connected.
![](/vehicles/kentre/xxxis/mys/elalyoontzec.png)
-
Slowly operate clutch pedal about
10 times. Fill reservoir with clean
fluid as necessary.
-
Unbolt slave cylinder from
transmission. Fit BMW special tool
21 5 030. Press slave cylinder
pushrod completely into slave
cylinder.
-
Hold slave cylinder so that bleeder
valve is at the highest point.
-
Open bleeder valve.
Once brake fluid appears with out
air bubbles, withdraw pushrod
completely.
Press slave cylinder pushrod all
the way in.
If brake fluid appears without air
bubbles close bleeder valve and
slowly release pushrod. Repeat
procedure until fluid runs out clear
and without bubbles.
-
Disconnect bleeder hose. Install
slave cylinder to transmission. Add
clean brake fluid to reservoir as
necessary. Check clutch
operation.
Tightening torque
Clutch slave
cylinder to
transmission
22 Nm (16 ft-lb)
Clutch master cylinder,
![](/vehicles/kentre/xxxis/mys/map.png)
replacing
The clutch master cylinder is mounted
to the pedal assembly directly above
the clutch pedal.
-
Disconnect negative (-) cable from
battery.
CAUTION!
Prior to disconnecting the battery,
read the battery disconnection
cautions given at the front of this
manual on page viii.
-
Raise and safely support vehicle.
-
Remove under transmission
splash guard if applicable.
-
Remove brake fluid reservoir cap.
Using a clean syringe, remove
brake fluid from reservoir.
-
Disconnect fluid supply hose from
brake master cylinder. Place a
pan under hose to catch any
excess fluid.
-
Working in engine compartment,
disconnect fluid line fitting from
master cylinder.
Working at left rear of engine
compartment:
Peel rubber edge seal off top of
panel.
Twist plastic panel retainers
(arrows) 90° and pull out to
remove.
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