RepairPal Certified shops can diagnose and repair your 1990 Chevrolet G20. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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The problem is with the flexible brake hose..........over time they break down inside and swell holding brake pressure in the line instead of allowing the pressure to dissipate...change the hose
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YOU ARE WELCOM, BRAKE HOSE COLLAPSE IS A COMMON PROBLEM! BRK. FLUID CANNOT RETURN TO MASTER CYL. THUS KEEPING PRESSURE ON CALIPER.