21 00 006 Bleeding Clutch Hydraulic System

21 00 006 Bleeding clutch hydraulic system

Special tools required
- 21 5 030

Necessary preliminary tasks:
- Remove transmission underbody protection if necessary.
- Remove microfilter housing if necessary

Important! From 08.06 a plastic clutch slave clyinder is installed in the E8X, E9X.
Important notes on installation are described in this work step





Unfasten nuts and remove clutch slave cylinder (pressure line remains connected).





Fit special tool 21 5 030 to the clutch slave cylinder (1).
Press piston rod (2) completely into clutch slave cylinder with the help of the spindle.

Connect breather devise to brake fluid expansion tank.

Important! Check relevant operating instructions for each device.
Charging pressure must not exceed 2 bar.





Connect bleeder hose to bleeder valve (1).
Hold clutch slave cylinder in illustrated position (refer to figure) with special tool 21 5 030.
Open bleeder valve (1).
If bubble-free brake fluid emerges, retract piston rod (2) of clutch slave cylinder with aid of the spindle a little and press back in again.
If no air bubbles escape, close bleeder valve (1), otherwise repeat this process.

Important! Do not under any circumstances remove special tool 21 5 030 from clutch slave cylinder when brake system is pressurized
Piston with push rod can jump out of the clutch slave cylinder.

Switch off bleeder unit or remove from brake fluid expansion tank.





Slowly retract piston rod (2) of clutch slave cylinder (1) with special tool 21 5 030.
Remove special tool 21 5 030 from clutch slave cylinder (1).





Fit clutch slave cylinder to the transmission.

Installation:

Replace self-locking nuts.
Tightening torque, 21 52 5AZ

Correct brake fluid level in expansion tank.