1994 Mercury Villager when you press the brakes

1994 MERCURY VILLAGER
210,000 MILES • 6 CYL • 2WD • AUTOMATIC
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EDGAR5
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When i press my brakes in a stop or red light my car starts to accelerated and the pedal goes to the ground. Took it to a garage they told me it was the master cylinder. Change it and it still doing the same thing. They charge me $ 250.00. what else could it be the problem. I think it may be the Booster. how to check it.
Nov 4, 2010 at 10:04 PM
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WRENCHTECH
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If the pedal starts good and then drops slowly, it's called bypassing. If you are not losing any fluid, the most common cause is a bad master cylinder but in some rare cases it can also happen in the ABS unit, especially if it is a rear wheel only system.
Nov 5, 2010 at 7:36 AM