GM Cavalier/Sunbird/Skyhawk/Firenza 1982-1994

Proportioning Valves and Failure Warning Switch

Print

These parts are installed in the master cylinder body on all models except those equipped with the 1985-86 V6 engine. On these models the proportioning valve and the brake pressure differential warning switch is located to the left frame rail below the master cylinder.

REMOVAL & INSTALLATION



Proportioning Valves

See Figure 1

  1. Remove the proportioner valve caps. It may be necessary to remove the master cylinder reservoir.
  2.  
  3. Remove and discard the valve cap O-rings.
  4.  
  5. Remove the proportioner valve piston springs, then remove the valve pistons using needle-nose pliers. Be careful not to scratch or damage the piston stems.
  6.  
  7. Remove the valve seals from the proportioner valve pistons.
  8.  
  9. Clean all parts in clean denatured alcohol, then dry with compressed air. Inspect the valve pistons for corrosion or deformation and replace if necessary.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Removal of the proportioner valves - 1994 vehicle shown

To install:
  1. Lubricate new proportioner valve cap O-rings and valve seals with the silicone grease given in the repair kit. Also, lubricate the stem of the proportioner valve pistons.
  2.  
  3. Place new proportioner valve seals on the proportioner valve pistons with the seal lips facing upward toward the proportioner valve cap.
  4.  
  5. Position the proportioner valve pistons and seals into the master cylinder body.
  6.  
  7. Place new proportioner valve cap O-rings in the grooves in the proportioner valve caps.
  8.  
  9. Install the valve caps in the master cylinder body, then tighten the caps to 20 ft. lbs. (27 Nm).
  10.  
  11. If removed, install the master cylinder reservoir.
  12.  

Fluid Level Switch

See Figures 2 and 3

  1. Disconnect the negative battery cable.
  2.  
  3. Detach the electrical connector from the fluid level switch.
  4.  
  5. Using needle-nose pliers, compress the switch locking tabs at the inboard side of the master cylinder reservoir and remove the switch.
  6.  



Click image to see an enlarged view

Fig. Fig. 2: The fluid level switch is mounted in the master cylinder reservoir



Click image to see an enlarged view

Fig. Fig. 3: Remove the switch by using needle-nose pliers to compress the switch locking tabs

To install:
  1. Press the fluid level switch into the master cylinder reservoir until it snaps into place.
  2.  
  3. Attach the switch electrical connector.
  4.  
  5. Connect the negative battery cable.
  6.  

 
label.common.footer.alt.autozoneLogo