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Damaged, rusty or bent guide bolts, bad caliper (archive)

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Posted by Bill R. on December 12, 2000 at 10:53:22:

In Reply to: Dragging brake...and mechanic dragging his ass.... posted by John Morrison on December 12, 2000 at 10:35:55:

piston or bad master cylinder. Most likely damaged rusty or bent guide bolts, the caliper must slide freely on these bolts. Since i know in the past you have done it yourself, raise the rear and remove the wheel. Remove the rear pads and retract the caliper piston. Then assemble without the pads and see how easy the caliper slides back and forth on the guide bolts. It should be free. If one is bent then the caliper will bind and cause your problem
About a month ago I had the rear rotors and pads replaced by the local BMW dealer. For the second time since that happened, I have pulled into my parkade at work to find the left rear wheel too hot to touch, with the sick smell of burning brake pad in the air. And what's more, I've noticed the car is dragging, noticable going downhill.

The last time I brought it in, they said they couldn't find anything...they suggested that I was driving around with my parking brake on...sorry...I'm not that stupid, plus the other side was fine.

What would cause 1 side to drag in the rear?...Bubble in the system?...

Please help me before I go in and get bamboozled again!

John





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