Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors

STARTING AND OPERATING THE VEHICLE
To move a vehicle immobilized by the spring brakes due to
loss of air pressure in the brake system, perform the following
procedure:
1. Remove the cap from the
spring chamber.
2. Remove the release stud
assembly from the side pocket,
and remove the release nut and
washer from the release stud.
VEHICLE RECOVERY AND SPRING BRAKES
4. Insert the release stud
through the opening in the
spring chamber where the cap
was removed. Insert it into the
pressure plate. Turn the release
stud 1/4 turn clockwise in the
pressure plate. This secures
the cross pin into the cross pin
area of the pressure plate and
locks it into the manual release
position.
5. Assemble the release stud
washer and nut on the release
stud.
3. Slide out the release stud.
Medium Duty (R05/09) Y53-6027 – 143 –