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Home >> GMC >> 1980 >> Rally G3500, Van Cargo >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Power Brake Units - BENDIX HYDROBOOST >> Hydro-Boost Diagnosis >> Condition >> Brakes Grab On Application

Brakes Grab On Application

POSSIBLE CAUSE CORRECTION
1) Broken spool return spring. 1) Replace spring.
2) Faulty spool action caused by contamination in system. 2) Inspect, clean and replace all booster seals.