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Removal Procedure

WARNING: This page is about a different car, the 2004 Buick Regal and 2004 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the master cylinder reservoir. Refer to Master Cylinder Reservoir Replacement .
    2. Fig 1: 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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