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
- Disconnect the negative battery cable.
- Disconnect the electrical lead from the switch.
- Place rags under the unit to absorb any spilled brake fluid.
- 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.
- Remove the mounting screws and remove the switch/valve assembly.
- 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.
- Place the new unit in position and install it to its mounting bracket with screws.
- Remove the tape from the hydraulic lines and connect them to the unit. If necessary, tighten the line connections at the master cylinder.
- Connect the electrical lead.
- Connect the negative battery cable.
- Bleed the brake systems.