4-22 AIR SYSTEM - Continued
4-22.3 Spring Brake Valve.
This task covers
Shop Equipment, Automotive
22, Appendix E Pipe Sealant
Maintenance and Repair,
Main Engine Shutdown (see para. 2-10)
APU Shutdown (see para. 2-12)
Batteries Disconnected (see para. 4-24)
Truck Wheels Blocked
All Air Tanks Drained
Death or serious injury could occur if compressed air is directed against the skin. Always
drain all air tanks via the draincocks prior to maintaining the spring brake valve.
This valve is installed on the frame cross member above the rear axle.
Tag and disconnect air lines A, B, C and D from
spring brake valve
Remove capscrews and locknuts and remove
spring brake valve from truck
Remove the elbow connectors from each port.
Make a sketch to indicate which elbows fit which ports.
Coat elbows with pipe sealant (item 22, Appendix
E) and install on new valve
Install the spring brake valve in the truck using the capscrews and locknuts
(3) Install a pressure gage in a tee to port C. Connect all air lines as noted in step 1 of REMOVAL
preceding. Coat all pipe threads with pipe sealant (item 22, Appendix E) prior to installation.