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To inspect slack adjusters on S-cam brakes, you need to:
A.  Park on a hill and test the brakes.
B.  Put on gloves and push in the slack adjusters.
C.  Remove the drum and look inside.
D.  Chock the wheels and disengage the parking brake.
Check each slack adjuster after parking on level ground, setting wheel chocks, and disengaging the parking brake. Pull the slack adjusters to make sure they do not move more than about one inch from where the push rod is attached. If they move more than one inch, they may be out of adjustment and will need to be fixed.

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