GM Cadillac 1967-1989 Repair Guide

Combination Valve

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The combination valve used on Cadillac models is a three-function valve. It serves as a metering valve, balance valve, and brake warning switch. There are two different valves, one manufactured by Bendix and one manufactured by Kelsey-Hayes. Both valves serve the same function and differ only in minor details. In any case, all combination valves are non-adjustable and must be replaced if they are found to be defective.

REMOVAL & INSTALLATION



See Figures 1 and 2

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the electrical lead from the switch.
  4.  
  5. Place rags under the unit to absorb any spilled brake fluid.
  6.  
  7. Clean any dirt from the hydraulic lines and the switch/valve assembly. Disconnect the hydraulic lines from the assembly. If necessary, loosen the line connections at the master cylinder. Tape the open line ends to prevent the entrance of dirt.
  8.  
  9. Remove the mounting screws and remove the switch/valve assembly.
  10.  

To install:
  1. Make sure that the new unit is clean and free of dust and lint. If in doubt, wash the new unit in clean brake fluid.
  2.  
  3. Place the new unit in position and install it to its mounting bracket with screws.
  4.  
  5. Remove the tape from the hydraulic lines and connect them to the unit. If necessary, tighten the line connections at the master cylinder.
  6.  
  7. Connect the electrical lead.
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Bleed the brake systems.
  12.  



Click image to see an enlarged view

Fig. Fig. 1: Common combination valve mounting



Click image to see an enlarged view

Fig. Fig. 2: Cutaway view of Bendix combination valve

 
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