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Home >> Mercury >> 1967 >> Commuter 6.7L Eng VIN M, Automatic Trans >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brake Trouble Shooting >> Trouble Shooting Drum Brakes >> Power Brake Unit Does Not Boost >> Power Unit Operating; Braking Action Abnormal

Power Unit Operating; Braking Action Abnormal

Fluid low. Glazed, dirty, or oily linings.