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Date:         Tue, 2 Nov 2004 08:55:09 EST
Reply-To:     THX0001@AOL.COM
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         George Goff <THX0001@AOL.COM>
Subject:      Re: variable brake pedal travel / Internal Leak
Content-Type: text/plain; charset="US-ASCII"

In a message dated 11/1/04 1:34:41 PM, wetwesty@TACTICAL-BUS.INFO writes:

<< I have noted a variance In pedal movement that I have tracked to amount of

vacuum in the system. >>

Better stay on the trail because, considering the functioning and construction of a vacuum brake booster, it is impossible for a vacuum leak to change the amount of brake pedal movement. A vacuum leak might cause the perception of the amount of movement to seem different, but that is all it will change.

Whenever this subject was broached, I suggested that the problem might be caused by an internal leak in the master cylinder. Apparently some thought that an internal leak meant a leakage into the vacuum brake booster. A leak into the brake booster is an external leak, for it is external to the master cylinder. An internal leak in a master cylinder is leakage around the piston cups into the fluid reservoir. If an internal leak in a master cylinder is severe enough, it can readily be detected by watching the surface of the fluid in the reservoir while depressing the brake pedal fast and hard. The pulse of leaking fluid will appear as an eddy (for want of a better word) on the surface of the reservoir fluid as the leaking piston cup burps.

George


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