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, Fri, 25 Jul 2014 08:16:07
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TML - - Here in the rust belt rotors can begin to take a coat of rust scale, that creeps in starting from outside rim and hub. It is harder than the regular iron, and is relatively slippery and so braking is hurt by it. The longer it goes on building, the more it creeps out onto the flat surface. If you have a strip of clean metal showing, maybe what's gone on is, that rust growing out onto most of the rotor surface. Probably as bad if not worse on back side.
You CAN get rotors turned but sometimes they come back too thin, or thinner and more likely to warp, or they weren't clamped properly and they get turned out of the plane of rotation of the hub.
So it usually makes more sense to buy new rotors, and new pads. Try that and see if your caliper isn't okay.
Calipers can seize from rust, too, and yours might have, but you can tell without much trouble by retracting the piston, then lightly touching brakes with car up on jacks and no pads in and seeing if it does come back out or not.
You can knock and grind scale rust off but there's no point, where it was will be lower than the rest of the rotor surface and before the pads wear down to make contact with the cleaned surface, it will have built fresh rust scale.
The rear rotors are the same on 9000s and on post-87 C900s, and I have seen clean bright rear rotors on cars at junkyards, easy and cheap enough to harvest.
posted by 71.173.75...
, Fri, 25 Jul 2014 06:50:16, Fri, 25 Jul 2014 08:16:07, Tue, 29 Jul 2014 08:40:07
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