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When we used Corvette brakes in Trans-Am racing Camaros we generally had to use a rubber hammer to beat the snot out of the rear calipers as part of the bleeding process. The hammering shook loose the little bubbles of air that stayed trapped between the piston and the bore, and who knows where else. I have included hammering on the caliper with a rubber mallet as part of the standard bleeding exercise for disc brake calipers ever since.
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