21 00 006 Bleeding Clutch Hydraulic System

WARNING: This page is about a different car, the 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW M Roadster, and 2001 BMW M Coupe. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

21 5 030. Refer to CLUTCH - SPECIAL TOOLS .

Necessary preliminary tasks:

Remove transmission underbody protection if necessary.
Remove microfilter housing is necessary.

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

Fig 1: Removing Clutch Slave Cylinder

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Fit special tool 21 5 030 on clutch slave cylinder (1).

Press piston rod (2) with aid of spindle completely into clutch slave cylinder.

Fig 2: Pressing Piston Rod Into Clutch Slave Cylinder

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Connect bleeder unit to brake fluid expansion tank.

IMPORTANT: Check relevant Operating Instructions for each device.

Charging pressure should not exceed 2 bar.

Connect bleeder hose to bleeder valve (1).

Fig 3: Connecting Bleeder Hose To Bleeder Valve

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Hold clutch slave cylinder in illustrated position (refer to Fig 1) 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 spindle a little and press in again.

If no air bubbles escape, close bleeder valve (1), otherwise repeat procedure.

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 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.

Fig 4: Retracting Piston Rod Of Clutch Slave Cylinder

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Remove special tool 21 5 030 from clutch slave cylinder (1).

Fit clutch slave cylinder to transmission.

Fig 5: Fitting Clutch Slave Cylinder To Transmission

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Installation:

Replace self-locking nuts.

Tightening torque 21 52 5AZ, refer to 21 52 CLUTCH OPERATION (HYDRAULIC) .

Correct brake fluid level in expansion tank.