Figure 1-33. Air System (Cont)
Kneeling valves (6) on the front tires allow the front of the vehicle to be lowered for internal air transport. Quick release
valves (7) are provided for each axle to exhaust air from the CTIS when the operator selects a mode which requires
a lower pressure setting. Air pressure is also used to keep the cab level through the use of air springs (8), mounted
below the rear cab support, and a cab leveling valve (9). The air system has enough reserve capacity to keep the
vehicle operational in the event of a partial system failure.