Cups don't hold vacuum. Not meant to.

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Posted by Chris Case [108.225.237.77] on Sunday, July 19, 2015 at 18:57:01 :

In Reply to: OK Now I have Brakes posted by Willy-N [72.171.192.61] on Sunday, July 19, 2015 at 18:48:18 :

Cups act as valves- remember bicycle pumps? The leather cup acts as a one way valve. Air gets sucked past it as you pull up on the handle. Brakes systems work that way to I guess- your vacuum pump can suck air past the cups in other wheel cylinders, or the master too.

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Re: Cups don't hold vacuum. Not meant to. - Willy-N 23:21:23 07/19/2015

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