W350 1 Ton Pickup 4WD V8-360 5.9L VIN 1 4-bbl (1988)
Brake Proportioning/Combination Valve: Testing and Inspection
Hold Off Valve Inspection
Normal Operation
A visual check will show that the valve stem extends slightly when the brakes are applied and retracts when the brakes are released.
In Case of Malfunction
In case of a hold-off valve malfunction, remove the valve and install a new combination valve assembly.
CAUTION: Follow correct procedure to bleed the hydraulic system on vehicles equipped with hold-off valves.
