Brake Proportioning/Combination Valve: Service and Repair

COMBINATION VALVE REPLACEMENT (NON-ABS)

The combination valve is not a repairable component. The valve is serviced as an assembly whenever diagnosis indicates replacement is necessary.
(1) Remove air cleaner cover and hose for access to valve, if necessary.
(2) Disconnect differential pressure switch wire at combination valve. Do not pull switch wire to disconnect. Unsnap connected lock tabs to remove.
(3) Disconnect brake lines at combination valve and remove valve.
(4) Connect brakelines to replacement valve. Start line fittings by hand to avoid cross threading. Tighten fittings snug but not to required torque at this time.
(5) Connect wire to pressure differential switch.
(6) Bleed brakes.
(7) Tighten brake line fittings to 18-24 N.m (160-210 in. lbs.) torque after bleeding.