I have had a bit of a whine from the back for a while, but mainly noticeable on longer drives. Usually it seems to come from the right, but this weekend on a fun run I thought it was from the left. Up till today, no real worries, but figured it should be looked at sometime.
Today, after a 25 km (~15 mile) drive, coming off the highway I noticed a scraping sound, much like an excavator scraping on rock. Stopped, the noise was gone, slight rev of the engine, no noise. Pull away from the stop, on a slight uphill, and the noise is there and then disappears. Gas up and then home, I decided to check the wheel hub temperatures. 126°F on the driver's side, 138°F on the passenger side, and about 121°F on the fronts. All the calipers read about 119°F.
I decided to jack the car up (because I can
) and see what I could find. No stones or evidence of anything grinding between the back plates and discs. The brake pads look good. No excessive play, at least to my feel on either wheel. The discs appear to be slightly warped, but not excessively (there is a bit of drag on both on one side) - probably as a result of setting the parking brake after a spirited track drive. Rotating the discs with the wheels removed, the passenger side sounds slightly noisier, but nothing that I would call excessive, and I can't feel it as being a bad bearing.
So now I am debating - do the passenger side bearing as a guess ( I'll need to acquire a puller I suspect, but that is not necessarily a bad thing), take it to a mechanic (probably the dealer) or ignore it and take it for another drive? I hate changing parts on the basis of guessing and gut feel.
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