GM Firebird 1982-1992 Repair Guide

Master Cylinder

Imprimir

REMOVAL & INSTALLATION



See Figures 1, 2 and 3



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Fig. Fig. 1: Master cylinder



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Fig. Fig. 2: Brake pipe removal



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Fig. Fig. 3: Master cylinder removal

  1. Disconnect hydraulic lines at master cylinder.
  2.  
  3. Remove the retaining nuts and lockwashers that hold cylinder to firewall or the brake booster. Disconnect pushrod at brake pedal (non-power brakes only).
  4.  
  5. Remove the master cylinder, gasket and rubber boot.
  6.  
  7. On non-power brakes, position master cylinder on firewall, making sure pushrod goes through the rubber boot into the piston. Reconnect pushrod clevis to brake pedal. With power brakes, install the cylinder on the booster.
  8.  
  9. Install nuts and lockwashers. Torque nuts to 22-30 ft. lbs. (30-45 Nm).
  10.  
  11. Install hydraulic lines then check brake pedal free play.
  12.  
  13. Bleed the brakes.
  14.  

OVERHAUL



See Figures 4 through 13



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Fig. Fig. 4: Exploded view of a master cylinder



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Fig. Fig. 5: Removing the reservoir



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Fig. Fig. 6: Prying out the snapring



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Fig. Fig. 7: Removing the snapring



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Fig. Fig. 8: Removing the primary piston



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Fig. Fig. 9: Master cylinder parts



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Fig. Fig. 10: Removing the O-ring



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Fig. Fig. 11: Installing the secondary piston



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Fig. Fig. 12: Installing the primary piston



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Fig. Fig. 13: Installing the reservoir

This is a tedious, time-consuming job. You can save yourself a lot of trouble by buying a rebuilt master cylinder from your dealer or parts supply house. The small difference in price between a rebuilding kit and a rebuilt part usually makes it more economical, in terms of time and work, to buy the rebuilt part.

  1. Remove the reservoir cover and diaphragm. Discard any brake fluid in the reservoir.
  2.  
  3. Inspect the reservoir cover and diaphragm for cuts, cracks, or deformation. Replace any defective parts.
  4.  
  5. Depress the primary piston and remove the lock ring.
  6.  
  7. Direct compressed air into the outlet at the blind end of the bore and plug the other outlet to remove primary and secondary piston.
  8.  
  9. Remove the spring retainer and seals from the secondary piston.