GM Blazer/Jimmy/Typhoon/Bravada 1983-1993 Repair Guide

Slave (Secondary) Cylinder

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The slave cylinder is located on the left side of the bell housing and controls the clutch release fork operation. For more information, please refer to understanding the clutch, earlier in this section.

REMOVAL & INSTALLATION



See Figure 1

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and support the front of the vehicle using jackstands.
  4.  
  5. Disconnect the hydraulic line from the clutch master cylinder. Immediately plug or cap all openings to prevent system contamination or excessive fluid loss. If equipped, remove the hydraulic line-to-chassis screw and the clip from the chassis.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: Slave cylinder and hydraulic line mounting

  1. Remove the slave cylinder-to-bell housing nuts.
  2.  
  3. Remove the pushrod and the slave cylinder assembly from the vehicle, then overhaul it (if necessary).
  4.  

To install:
  1. Remove the plugs or caps, then install and secure the hydraulic line to the slave cylinder. Refer to the illustration for proper line alignment.
  2.  

If used, be sure to properly install the clip and hydraulic line-to-chassis screw.

  1. Properly bleed the hydraulic system.
  2.  
  3. Install the slave cylinder to the bell housing, then secure using the retaining nuts and tighten to 13 ft. lbs. (18 Nm).
  4.  
  5. Remove the jackstands and carefully lower the vehicle.
  6.  
  7. Connect the negative battery cable.
  8.  

OVERHAUL



See Figure 2

Most vehicles covered by this guide utilize an easily rebuilt clutch slave cylinder assembly. The following procedure may be used for most hydraulic clutch slave cylinders.



Click image to see an enlarged view

Fig. Fig. 2: Exploded view of a common slave cylinder assembly

  1. Remove the shield (if equipped), the pushrod and dust cover from the slave cylinder, then inspect the cover for damage or deterioration.
  2.  
  3. Remove the snapring from the end of the cylinder bore.
  4.  
  5. Shake the plunger out of the cylinder body. If difficulty is encountered, gently tap the master cylinder assembly on a block of wood to help eject the plunger assembly from the cylinder bore.
  6.  
  7. Remove the spring and seal.
  8.  
  9. Using clean brake fluid, clean all of the parts.
  10.  

To assemble:
  1. Inspect the cylinder bore and the plunger for ridges, pitting and/or scratches, the dust cover for wear and cracking; replace the parts if any of the conditions exist.
  2.  
  3. Use new seals and lubricate all of the parts in clean brake fluid (DOT 3). Install the spring, the plunger seal and the plunger into the cylinder bore, then install a new snapring.
  4.  
  5. Lubricate the inside of the dust cover with Girling® Rubber Grease or equivalent, then install it into the slave cylinder.
  6.  

Be careful not to use any lubricant that will deteriorate the rubber dust covers or seals.

HYDRAULIC SYSTEM BLEEDING



Bleeding air from the hydraulic clutch system is necessary whenever any part of the system has been disconnected, or when the fluid level (in the reservoir) has been allowed to fall so low, that air has been drawn into the master cylinder.

  1. Fill the master cylinder reservoir with new brake fluid conforming to Dot 3 specifications.
  2.  


WARNING
Never, under any circumstances, use fluid which has been bled from a system to fill the reservoir as it may be aerated, have too much moisture content and possibly be contaminated.

  1. Raise and support the front of the vehicle safely using jackstands.
  2.  
  3. Remove the slave cylinder retainers.
  4.  
  5. Hold the slave cylinder at approximately 45° so the bleeder screw is located at the highest point. Have an assistant fully depress and hold the clutch pedal, then open the bleeder screw.
  6.  
  7. Close the bleeder screw and have your assistant release the clutch pedal.
  8.  
  9. Repeat the procedure until all of the air is evacuated from the system. Check and refill the master cylinder reservoir as required to prevent air from being drawn through the master cylinder.
  10.  

Never release a depressed clutch pedal with the bleeder screw open or air will be drawn into the system.

 
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