I'm guessing that the brake shoes are not maladjusted, since the handbrake
seems to work fine - presumably if the brakes were maladjusted I wouldn't have
much of a handbrake?
If it is not the brake shoe adjustment, what might be wrong with the calipers
to cause this problem? What do I do about it?
Richard and Daffy
npenney@mde.state.md.us on 12Oct2000 02:21 PM
To: Richard B Gosling/1M/Caterpillar@Caterpillar
spitfires@autox.team.net@INTERNET
cc:
Subject: Re: What's wrong with my brakes?
Retain Until: 11/11/2000 Retention Category: G90 - Information and
Reports
Perkins Confidential: Green
Being able to pump up the brakes is not normally an indicator of a defective
master cylinder, it's more commonly an indicator of maladjusted brake shoes.
It can also indicate a problem with the calipers.
In any case, you're first push on the brake pedal pushes the brake components
out to the drum (or against the rotor). The second pump happens faster then
the brake components retract. Hence the pump up. And, hence the
repeatablilty when you give the brake components a chance to fully retract.
A bad master cylinder will not pump up.
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