BMW Coupes and Sedans 1970-1988 Repair Guide

Clutch Slave Cylinder

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REMOVAL & INSTALLATION



See Figures 1, 2, 3 and 4

  1. Remove enough brake fluid from the reservoir to drop the fluid level below the refill line or hose connection.
  2.  
  3. From underneath the vehicle, remove the circlip or retaining bolts, depending on the model, which secure the slave cylinder to the transmission case.
  4.  
  5. Disconnect the brake line and remove the slave cylinder. Place a container below the hydraulic line to catch any dripping brake fluid.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: Loosen the retaining bolts securing the slave cylinder to the transmission body



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Fig. Fig. 2: Remove the slave cylinder from the vehicle. Notice the direction of the bleed screw



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Fig. Fig. 3: Before installing the slave cylinder, apply grease to the end of the pushrod



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Fig. Fig. 4: After the installation is complete, bleed the clutch hydraulic system

To install:
  1. Installation is the reverse or removal. Make sure to install the cylinder with the bleed screw facing downward. When installing the front pushrod, coat it with Molykote® Long-term 2 or equivalent anti-seize compound. Bleed the system.
  2.  

On the 325 Series and M3, if the engine uses a 2-section flywheel, make sure you use a larger slave cylinder with a diameter of 22mm, instead of the usual cylinder diameter of 20.5mm.

OVERHAUL



  1. Remove the master cylinder and.or slave cylinder as described in this section.
  2.  
  3. Remove the rubber boots or seals, then pull the piston out. Clean all parts in alcohol.
  4.  
  5. Inspect the cylinder bores for corrosion or scoring, and replace any parts as needed.
  6.  
  7. Install overhaul kits, consist of the parts listed below:
  8.  

Master Cylinder:

  1. Rubber boot
  2.  
  3. Circlip
  4.  
  5. Grooved piston ring seals.
  6.  
  7. Sealing plug which fit into the top of the unit.
  8.  
  9. Washer which is situated under the sealing plug.
  10.  

Slave Cylinder:

  1. Ring type retainer.
  2.  
  3. Rubber boots or seals.
  4.  

BLEEDING THE CLUTCH SYSTEM



See Figure 4

  1. Fill the reservoir.
  2.  
  3. Connect a bleeder hose from the bleeder screw on the slave cylinder to a container filled with brake fluid.
  4.  
  5. Pump the clutch pedal about 10 times and hold down.
  6.  
  7. Open the bleeder screw and watch the stream of escaping fluid. When no air bubbles escape, close the bleeder screw and tighten.
  8.  
  9. If this procedure fails to produce a bubble-free stream:
    1. Pull the slave cylinder off the transmission without disconnecting the fluid line.
    2.  

  10.  

Do not depress the clutch pedal while the slave cylinder is removed.

  1. Depress the pushrod in the cylinder until it hits the internal stop. Then, reinstall the cylinder.
  2.  
  3. Repeat the bleeding procedure.
  4.  

 
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