GILLIG LOW FLOOR, Руководство по обслуживанию

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Brakes & Wheels
278
Automatic Brake Adjuster Operational Check
Functional operation of the brake adjuster can be performed on the vehicle by using the following proce-
dure:
Block wheels to prevent vehicle from rolling.
Ensure system tank pressure is at 90–100 psi.
Check that push rod is fully retracted; apply air to release spring
brake.
If air is not available, spring brake must be manually caged back.
Manually de-adjust brakes (turn adjustment hex counterclockwise one full turn) to create an ex-
cessive drum to lining clearance condition. (A ratcheting sound should occur.)
Make a full service brake application. On release, allow sufficient time for brake to fully retract.
During the brake release, observe rotation of the adjustment hex (attaching a wrench on the hex
or scribing the hex will make this rotation easier to see).
This rotation indicates that an excessive clearance condition has been determined by the brake
adjuster, and it is making an adjustment to compensate. On each subsequent brake release, the
amount of adjustment and push rod travel will be reduced until the desired clearance is achieved.
If rotation of the adjustment hex is not observed, check foundation brakes for proper operation
and condition. If foundation brake assembly checks out OK and hex still does not turn, check
control arm and mounting bracket for possible worn, bent, or broken components. If the control
arm and mounting bracket check out OK, replace the adjuster and hardware.
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