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When I first apply the brakes they feel fine, but when I sit at a stoplight the pedal gradually sinks to the floor. Why?

April 26, 2017brakes feel Fine floor gradually pedal sinks Sit stoplight

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When I first apply the brakes they feel fine, but when I sit at a stoplight the pedal gradually sinks to the floor. Why?

1 Answer

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Posted

The master cylinder has an internal leak bleeding off pressure. The car needs immediate professional attention because there is no way to predict what the brake pedal will do next time.