Chevrolet T-Series Owner's Manual page 169

4. Put the release stud, nut and flat washer into
the chamber.
5. Turn the stud clockwise one quarter of a turn.
3. Remove the rubber
cap from the rear of
the chamber.
7. At the repair facility, apply air pressure of at
least 70 psi (480 kPa) to the brake chambers,
either from an external air supply or the
vehicle's air system.
8. Turn the stud nut counterclockwise several
turns. Remove the stud from the chamber.
9. Replace the stud and washer and tighten the
nut into the side of the chamber.
10. Replace the rubber cap.
6. Turn the stud nut
clockwise several
turns to release the
brakes. Follow the
same procedure
to release the other
brake or brakes.
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