A leaky brake vacuum hose, brake check valve. Defective booster
Bad check valve could allow vacuum to bleed out of the booster causing a hard brake-
Do this start the car up run it for a few minutes-shut it off wait for 4-6 mins. Then try the brakes to see if there's a power assist-if not replace the brake check valve.
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Tuesday, October 2nd, 2007 AT 12:14 AM