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Old 04-22-2013, 05:26 AM
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Originally Posted by bubbahotep View Post
Maybe my term is wrong. That's the little metal pin that the brake booster pushes into. It slides out easily of the master cylinder. It's not a piston, sorry

This piece is included in some master cylinders so that the same master can be used for power or manual brakes.

Manual brakes have a deeper bore in the piston to retain the brake pushrod.
Power brakes usually have a very shallow bore as the piston pin is retained by the booster.
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