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Just got the call from the shop. A piece of metal from the emergency brake did break off and was stuck inside the drum causing the squealing sound. It did ware a groove in the drum but not enough to replace the drum. A little over $400 to repair. I’ll have to wait a few days for the parts to come from Porsche. Should have it back in a couple of days. Still really surprised the former owner’s mechanics couldn’t find the problem. I didn’t understand how the brake assembly worked. Now that I know the emergency brake is a simple drum brake inside the hub of the disc it’s one of the first things I would have checked since driving and using the disc brakes didn’t effect the noise. Good honest mechanics are hard to find
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