21 00 006 Bleeding clutch hydraulic system

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 BMW 528xi, 2010 BMW 528i, 2009 BMW 528xi, 2009 BMW 528i, and 2008 BMW 528xi. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

21 5 030 . See MANUAL TRANSMISSION - SPECIAL TOOLS .

Necessary preliminary tasks:

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

Fig 1: Locating Clutch Slave Cylinder Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Fig 2: Identifying Special Tool 21 5 030, Clutch Slave Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.

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

Connect bleeder unit to brake fluid expansion tank.

IMPORTANT: Check relevant Operating Instructions for each device.
Charging pressure should not exceed 2 bar.

Fig 3: Identifying Special Tool (21 5 030) And Bleed Valve

Courtesy of BMW OF NORTH AMERICA, INC.

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.

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

Fig 4: Identifying Special Tool (21 2 030) And Piston Rod Of Clutch Slave Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.

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 5: Locating Clutch Slave Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.

Fit clutch slave cylinder to transmission.

Installation:

Replace self-locking nuts.

Tightening torque 21 52 5AZ . See CLUTCH - TIGHTENING TORQUES .

Correct brake fluid level in expansion tank.