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  1. Replies
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    Re: Air pressure sound in brakes

    It is that big black round thingy between the brake master cylinder and the firewall.
  2. Replies
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    7,346

    Re: Air pressure sound in brakes

    This is the sound of vacuum in the brake booster. It is just getting worn. The diaphragm is probably still good or you would get the sound at full pedal. I would just watch it and replace it if...
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