Brake Proportioning/Combination Valve: Tools and Equipment

The in-line proportioning valves used on this vehicle require special pressure fittings to test the proportioning valves for proper proportioning valve function. The pressure fittings are installed before and after the proportioning valve being tested to verify proportioning valve is maintaining the required hydraulic pressure to the rear wheel brake which it controls.

If a condition of premature rear wheel skid occurs on a vehicle, the proportioning valve should always be tested prior to it being replaced. This is due to the fact that there are conditions other then a faulty proportioning valve which can cause a premature rear wheel skid.

Testing proportioning valve pressures on a vehicle with or without ABS requires using the same special tools.

Proportioning Valve Pressure Test Fittings:

There are 4 Pressure Fittings, Special Tool 6805 or equivalent which are used for testing both rear proportioning valves mounted in the master cylinder.

Proportioning Valve Pressure Test Gauge Set:

The pressure gauges used for testing the new inline proportioning valves on both non-ABS and ABS brakes, is Pressure Gauge Set, Special Tool C-4007-A or equivalent currently used for testing the combination valve.