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Then I went to stop and when I pressed the pedal it made a loud swoosh sound, like air rushing out. The truck wouldnt even slow down with the normal amount of pressure on the pedal. I have to practically stand on the pedal now for it to stop.
i've replaced my master cylinder THREE times now, and each time after a few months it starts to leak and flash rust around the base/sides. however…it feels like my booster works. would air trapped in the lines cause it(the mc) to leak eventually?