A strong physical pull is necessary to move all the slack out of the travel.
After determining that brake adjustment is necessary:
Use a proper wrench to disengage the external locking device from the adjustment bolt of the slack adjuster.
Turn the adjustment bolt until the lining contacts the drum. If possible, visually check to see that the brake
linings are in contact with the brake drum.
When turning the adjustment bolt on the slack adjuster, the spline on the S cam shaft should turn in the
same direction as if a brake application were being made.
Back the adjustment bolt about 1/4 to 1/2 of a turn. This should result in proper adjustment.
Now re-check for free play of slack adjuster travel. The travel should now be between 1/2 and 3/4 of an
inch. If travel is checked by watching the push rod while someone makes a brake application, travel should
not exceed 1-1/2 inches.
Some types of parking brakes can be released mechanically by "winding them off" or "caging" them. A bolt, which runs
through the center of the chamber body, is turned to compress the spring. The plug must first be removed and the wrench
inserted. Instructions on how to "cage" is usually on the body of the parking brake. If all air is lost and the vehicle has to
be moved, the parking brake can be released by winding them off. DO NOT wind off the spring brakes after it has been
moved. Always block the wheels when caging the parking brake spring. Caging means the brakes are being released.
Parking brakes should never be disassembled without first compressing the spring with a wind-
off wrench. These springs are under extreme pressure and could cause serious personal Injury if
disassembly is attempted by anyone not experienced In servicing these units. Disassembly is a
job for a mechanic.
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