21 00 006 Bleeding clutch hydraulic system

WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks

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

IMPORTANT: From 08.06 a plastic clutch slave cylinder . See 2100006 BLEEDING CLUTCH HYDRAULICS (PLASTIC SLAVE CYLINDER) or 2152510 REMOVING AND INSTALLING/REPLACING CLUTCH SLAVE CYLINDER (PLASTIC) 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).

Fig 1: Identifying Clutch Slave Cylinder Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

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 Using Special Tool (21 5 030)

Courtesy of BMW OF NORTH AMERICA, INC.

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 bleed 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 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.

Fig 3: Removing Clutch Slave Cylinder Using Special Tool (21 5 030)

Courtesy of BMW OF NORTH AMERICA, INC.

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).

Fig 4: Pressing Piston Rod Into Clutch Slave Cylinder Using Special Tool (21 5 030)

Courtesy of BMW OF NORTH AMERICA, INC.

Fit clutch slave cylinder to transmission.

Installation:

Replace self-locking nuts.

Tightening torque 21 52 5AZ .

Fig 5: Identifying Clutch Slave Cylinder Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Correct brake fluid level in expansion tank.