Happy Sunday BB's (for most of us anyway..)

My 90 has what appears to be a stuck piston on the driver's side rear caliper. Outer perimeter of the rotor has a ring of rust. Inner half is fine. One piston appears to be stuck inside the caliper.

My question is since I replaced that caliper 2 1/2 years ago (totally seized then), any advice on how you would proceed? I'm probably going to replace the caliper, but I'm not sure what to do about the rotor and pads. Resurface or replace the rotor? Or leave as is and hope the rust will wear off. What about the pads?

I like having all the parts together when I start a job....

Thanks all for any help you can give!


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Jim 90 244DL 242K

Do as twofourty suggested. Without seeing your rotor the call is up to you whether to leave it as-is or have it turned.

I would add to the job jar a complete brake fluid flush. If you are going through calipers every couple of years it sounds to me like the existing fluid is old and the moisture it has absorbed is likely causing internal corrosion and seizure.

I'd replace the caliper,and the pads on both sides. If the rotor only has surface rust on the area where the piston siezed, no deep groves cut into it, or blueing, I'd leave it.

Depending on condition, I'd replace the front pads as well. My pre winter and spring PM include new pads all around, and a quick (sometimes not) check of the parking brakes.

Enjoy.

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84, 242GLTi, 167K, 4+OD, in rehab; 89, 245 DL, 263K, M 47, daily driver; 93, 245, auto, 167K ; and other toys.