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Old 04-06-2019, 12:12 PM   #2
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Join Date: Apr 2019
Location: SANTA ANA, California
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Re: all four caliper freeze up.

Your problem, for this old thread

Is the brake master cylinder shaft and the end plug that surrounds the shaft that goes to the brake booster.
There is a plug at the end of the M/C made of a fiber material (phenolic) that has failed and it swells and squeezes the shaft when the underhood temperature increases,
and the M/C fails to release.
Thus the brakes are locked on until the temperature goes back down.
I rebuild BMW Audi and Porsche parts



Last edited by Stealthee; 04-06-2019 at 09:11 PM. Reason: Removed link
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