SN95 Mustang 1994-2004 Mustangs Member Tech & Restoration Discussion

Strange Brake Hissing

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Old Sep 10, 2009 | 03:11 PM
  #1  
Ford Ferret's Avatar
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Joined: September 10, 2009
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From: Houston
Strange Brake Hissing

Hello can anyone help me. I test drove a 2004 Mustang GT and when I press on the brakes it is normal and the brakes work fine. However, if I press on the brake hard I hear a hissing noise that increases in volume the harder I press on the brake. In addition if I press on the brakes hard the idle drops.

Does anyone have any ideas? Is this normal? Thanks.
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Old Sep 15, 2009 | 03:43 AM
  #2  
chibirpro's Avatar
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Nice work--thank you for sharing-
Thanks so much for this. I appreciate the effort. It really helps a lot.
Glad to hear you're using this: I plan to keep it much more aggressively up-to-date than has been the case in the past, but don't hesitate to let me know if you find errors or need clarifications.
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Old Sep 15, 2009 | 07:37 AM
  #3  
1999Pony's Avatar
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Joined: September 28, 2007
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From: Midlothian, Va
Sounds like it could be an issue with the brake booster.
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