Brake and Air System Maintenance Instructions (Cont)
FRONT DOUBLE CHECK VALVE REMOVAL/INSTALLATION (CONT).
Three double check valves are mounted near front crossmember. One is mounted on
top and two are connected together in front of crossmember.
Tag and mark air lines before removal.
Disconnect four air lines (1).
Some vehicles have a nut, lockwasher, and screw. Others have a flanged nut and screw.
Remove nut (2), lockwasher (3), and screw (4). Remove lower double check valve (5) and middle
double check valve (6).