Problems diagnosing...
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New Member
Joined: Jan 2006
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Problems diagnosing...
My 2002 A6 3.0 has had a few issues that the local dealer has been unable to diagnose and have had it in 3 times for review. Any insight will be greatly appreciated
1. When coming to a stop with light brake pressure applied, I hear a grinding noise and can feel it a bit in the brake pedal. Only work I have had done is the timing belt a few months back and seemed to start shortly after having that work done....brakes and rotors check out ok, fluid level is good...No issues or sounds at regular speeds...
2. When I put car in reverse and with ait running belt, I get a sporadic belt squeal and if I back up while turning wheel, it makes horrendous noise (on top of squeal) that sounds like metal grinding (high pitched). Both are sporadic but happen together and stop when i turn the air off.....
Have had it to be checked several times and each time comes back clean, belt/brakes in great shape, no other visible signs and the technicians are unable to recreate.
1. When coming to a stop with light brake pressure applied, I hear a grinding noise and can feel it a bit in the brake pedal. Only work I have had done is the timing belt a few months back and seemed to start shortly after having that work done....brakes and rotors check out ok, fluid level is good...No issues or sounds at regular speeds...
2. When I put car in reverse and with ait running belt, I get a sporadic belt squeal and if I back up while turning wheel, it makes horrendous noise (on top of squeal) that sounds like metal grinding (high pitched). Both are sporadic but happen together and stop when i turn the air off.....
Have had it to be checked several times and each time comes back clean, belt/brakes in great shape, no other visible signs and the technicians are unable to recreate.
AudiWorld Super User
Joined: Jul 2006
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From: Chowdaah and Red Sox!
1.) try re-bedding the brakes? 2.) how far are you cutting the wheel?
if you are cutting to a point that the wheel stops and bumps back at you you are definitely hearing the steering rack whining and saying "PLeeease no more pain"...(just a guess..)
another guess is your secondary air injection system coming on randomly and coincidentally on when you are in reverse... referring to --> metal grinding / air raid siren<ul><li><a href="http://www.tirerack.com/a.jsp?a=AR4&url=%2Fbrakes%2Ftech%2Ftechpage.jsp%3F techid%3D85">procedure to re-bed brakes as per tirerack (its fun too...lol)</a></li></ul>
another guess is your secondary air injection system coming on randomly and coincidentally on when you are in reverse... referring to --> metal grinding / air raid siren<ul><li><a href="http://www.tirerack.com/a.jsp?a=AR4&url=%2Fbrakes%2Ftech%2Ftechpage.jsp%3F techid%3D85">procedure to re-bed brakes as per tirerack (its fun too...lol)</a></li></ul>
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