Re: Hissing Air leak noise 2003 Expedition
Just replaced my brake booster this weekend. I removed the clip on the inside, the four screws on the inside, the two screws holding the master cylinder on, the two screws holding the radiator reservoir on and the two screws holding the gadget above the master cylinder with the hoses. . I had air tools and it took me about an hour. If unskilled, pay to have it done. The part is about $100 and it will cause your check engine light to go on.