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GMC
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1981
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Forward Control 4.8L Eng VIN T, Standard Trans
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Repair and Diagnosis (Single Page)
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Brakes
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Mechanical - Hydraulic
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Brake System Trouble Shooting
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Condition & Possible Cause
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Brake Rough, Chatters or Pulsates
Brake Rough, Chatters or Pulsates
Excessive lateral runnout.
Parallelism not to specification.
Wheel bearings not adjusted.
Drums out-of-round.
Disc pad reversed.
Caliper not sliding.