Peterbilt Medium Duty Trucks Operator's Manual after 1-07

Operating Instructions
Driving Tips And Techniques
WARNING! Be extremely careful when deflating
the air springs. The rear of the vehicle will drop
about 3-1/2 inches (88 mm) when the air springs
are deflated. Make sure that no persons or
objects that could be injured or damaged are
under the vehicle.
To minimize the risk of damage or injury, do not
use the dump valve to deflate the air springs.
Operate the height control valve(s) manually to
ensure positive control of air spring deflation.
1.To minimize risk of injury, keep away from air
springs as they are being inflated.
ALIGNMENT PIN OR DOWEL CONTROL ARM
LINK BOLT
FROM DUMP VALVE SWITCH
FORWARD
02941A
Typical Height Control Valve (Top View)
Medium Duty (R10/06) Y53-6008 – 103 –