2005 Lexus SC 430

Brakes problem
2005 Lexus SC 430 V8 Two Wheel Drive Automatic 28000 miles

i bought my vehicle used with 28000 miles. The brakes make a popping noise when I brake in reverse then brake going forward. It seems as though the pads are loose and not staying in place. I had the brakes inspected and no problems were found. I was told to consult a Lexus dealer and talked to them over the phone and they said the pads needed replaced. That does not make sense for a car with 28000 miles that passed a brake inspection. Any insight into my problem?
Randall Beck
May 1, 2010.

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