Brake Proportioning/Combination Valve: Service and Repair

NOTE: The combination valve is not repairable. The valve is serviced as an assembly only.

REMOVAL
1. Remove air cleaner cover and hose for access to valve.






2. Unsnap connector lock tabs and disconnect differential pressure switch wire at combination valve. Do not pull switch wire to disconnect.






3. Disconnect brake lines at combination valve.
4. Remove mounting nut and remove valve.

INSTALLATION
1. Install valve and tighten mounting nut to 17 Nm (155 inch lbs.).
2. Connect brake lines to replacement valve. Start line fittings by hand to avoid cross threading.
3. Tighten brake line fittings to 14 Nm (124 inch lbs.).
4. Connect wire to pressure differential switch.
5. Bleed base brakes.