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 is necessary.

Important notes on installation are described in this work step.

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

Fig 1: 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: Special Tool 21 5 030, Clutch Slave Cylinder And Piston Rod

Courtesy of BMW OF NORTH AMERICA, INC.

Connect bleeder unit to brake fluid expansion tank.

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.

Piston with push rod can jump out of clutch slave cylinder.

Fig 3: Retracting Piston Rod Of Clutch Slave Cylinder

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: Special Tool 21 5 030, Clutch Slave Cylinder And Piston Rod

Courtesy of BMW OF NORTH AMERICA, INC.

Fit clutch slave cylinder to transmission.

Installation: 

Replace self-locking nuts.

Tightening torque: 5AZ, see 21 52 CLUTCH OPERATION (HYDRAULIC) .

Fig 5: Clutch Slave Cylinder Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Correct brake fluid level in expansion tank.