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GMC
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1980
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Rally G3500, Van Cargo
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Repair and Diagnosis
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Brakes
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Mechanical - Hydraulic
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Power Brake Units - BENDIX HYDROBOOST
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Hydro-Boost Diagnosis
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Condition
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Brake Pedal Pulls Down Slightly On Engine Start
Brake Pedal Pulls Down Slightly On Engine Start
POSSIBLE CAUSE
CORRECTION
1) Restriction in gear or booster return lines.
1) Replace lines or reposition to eliminate restriction.