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Removal Procedure

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Refer to Brake Fluid Irritant Caution in Cautions and Notices.
NOTE: Refer to Brake Fluid Effects on Paint and Electrical Components Notice in Cautions and Notices.
IMPORTANT: Do not wash the proportioning valve in any cleaning solution. The internal components are pre-lubricated with a special grease.
  1. Remove the master cylinder reservoir. Refer to Master Cylinder Reservoir Replacement .
    2. Fig 1: Identifying Proportioning Valve Components
    GM176833Courtesy of GENERAL MOTORS CORP.
  2. Remove the proportioning valve caps (1).
  3. Remove the O-rings (5).
  4. Remove the springs (2).
  5. Remove the proportioning valve pistons (3). Carefully use needle nose pliers so that you do not damage the piston stems.
  6. Remove the proportioning valve seals (4) from the pistons.
  7. Inspect the proportioning valve pistons for corrosion and deformation. Replace the valve pistons if necessary.
  8. Clean all of the parts in clean, denatured alcohol.
  9. Dry the parts with non-lubricated compressed air.
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