Rear discs gouged : mea culpa... - Saab 9-3SS Bulletin Board - Saabnet.com
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Rear discs gouged : mea culpa...
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Posted by magalar [Email] (#1325) [Profile/Gallery] (more from magalar) on Sat, 1 Feb 2014 11:33:14 Share Post by Email
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Well, it looks I was chasing the wrong cause when I accused the FEBI pads to be too hard on the OEM discs.

I had the rear discs resurfaced by a shop yesterday. When they look at them, they said : "sticky calipers, no doubt". So, I removed the calipers from the car, brought them to the bench to have a better look at the problem.

I did work the pistons with the parking brake lever and the special tool to retract them. All was well on that front.

I then removed the rubber bushings from the calipers. These were new from last fall. But at that time, I didn't take the time to clean the bore of the holes. So corrosion build-up was a problem, and the sliding pins were not sliding properly in the rubber bushings.

Another problem area was the bleeder. It was really hard to crack open, so I took the time to remove it completely, clean the threads with a die and reinstall with proper antiseize lube.

Then I drilled new holes for the external retaining springs. On both calipers, that spring was corroded in one hole, and I managed to break them both, even with careful use of a torch. The springs broke with almost no effort. I drilled the holes completely through, so next time, if need be, I'll use a long and narrow punch to push the broken spring from the calipers. That's the plan anyway.

It's the first car I have with aluminum calipers. Clearly, this material is not well suited to our salty environment. And I was not aware of all the specifics of good brake service. It's a lot more than just replacing pads and rotors...

Lesson learned. And my apologies to FEBI and GM...

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