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Have you recently used your brakes hard (made several 60+mph to 0mph stops or needed the TCS for prolonged periods?) If so, the rotors may have glazed. As the brakes heat up, their material can get transferred to the rotor.
Say you are traveling on a stretch of highway with intermittent intersections causing you to wait a red lights. You apply brakes to stop at the first light. Your brakes get hot. Each frequent stop from 60+mph heats up the pads. The pad material transfers to the rotor as you wait at the light. TCS works similarly, heating up the pad material, until you stop at a light. Pad material left on the rotor, as everything cools, solidifies to the rotor, creating a wavy surface -- what you may be feeling.
To fix this, I'll quote Dean:
http://www.saabnet.com/tsn/bb/9-5/index.html?bID=39571
"New pads can have dangerously low stopping power and EBC pads are very much this way. This is dangerous. You need to get to a low traffic area and speed up and brake over and over again till you start to feel the brakes working well. Forget the 'baby the brakes for days stuff days'. You may need to get the brakes very hot, this is true for EBC pads. Avoid full stops during this bedding in run. Do not stop with hot brakes and keep the pads clamped onto the rotors. There will be material transfer to the rotors, especially with pads like the EBC pads. That material transfer, while extremely thin, will feel as bad as a warped rotor. So when you see a report of "EBC warped my rotors", you know that the pads were not properly bedded in. Some suggest that the bedding in runs be continued until the pads are stinking hot or the metal rotors are discolored. I don't feel totally comfortable with that myself, but that is the direction that you need to be headed in during the bedding in runs. "
Best of Luck!
posted by 12.104.12...
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