GMC T-Series 1999 Owner's Manual page 160

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CAUTION:
D
Working on air brakes without first using
the release studs to compress the springs
can lead to injury. Never work on the air
brake chambers without first using the
release studs to compress the brake springs.
D
When the brake springs are manually
compressed, you will have no brakes.
-
Release your air
operated parking brakes
manually only to tow the vehicle. Never
drive the vehicle with the brakes released.
5-12
1. Block the wheels of the vehicle.
2. Remove the release stud and nut from the side
pocket of the brake chamber. Some chambers have
studs which are visible at all times.
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