Quote:
Originally Posted by o-blian
Exactly the same case for me a few weeks ago. After a quick check with soapy water on the valve block and on air lines, i decided to open the pump : it was the little circle springs on the top of the piston head. They were dirty, making an air leak. I advice you to open your pump before ordering a new one to check these pieces.
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How do you get to it? It seems its on the passenger side somewhere beside the engine and behind the wheel well.