GM Service Manual Online
For 1990-2009 cars only

Important: 

   • Install all new components included in the repair kit that are used in order to service the master cylinder.
   • Lubricate rubber parts with clean brake fluid in order to ease assembly.
   • Do not use lubricated compressed air on brake parts. Damage to rubber components may result.
   • If any hydraulic component is removed or disconnected, bleed all or part of the brake system.
   • The fastener tightening specifications are for dry, non-lubricated fasteners.
   • Perform service operations on a clean bench, free from all mineral oil materials.

The master cylinder for this vehicle is a composite design which contains a plastic reservoir and an aluminum body. This design is used in a diagonally split system. One of the front and one of the diagonally opposite rear brakes are served by the primary piston. The opposite front and rear brakes are served by the secondary piston.

The master cylinder incorporates the functions of a standard dual master cylinder. The master cylinder has a fluid level switch and integral proportioner valves. The proportioner valves are designed in order to provide a better front to rear braking balance during a heavy brake application.