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Home >> Pontiac >> 1966 >> GTO Eng CD WW, Not Available Trans >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brake Trouble Shooting >> Trouble Shooting Drum Brakes >> Power Brake Unit Does Not Boost >> Power Unit Does Not Operate

Power Unit Does Not Operate

Vacuum check valve stuck closed. Vacuum pipe bent, broken, or clogged. Blocked air inlet. Air valve sticking in diaphragm.

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