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Re: [oletrucks] Master Brake Cylinder Rebuild

To: <oletrucks@autox.team.net>
Subject: Re: [oletrucks] Master Brake Cylinder Rebuild
From: "Keith" <kvdurand@mail.esc4.com>
Date: Mon, 12 Jul 1999 18:09:17 -0700

Maybe the seal got cut when it was installed, or the pitting in the casting
is bad enough that it leaks by. You're welcome to my old master cylinder. I
think the casting is good. It came out of a 1956 half ton.

>Question.  What would cause a newly rebuilt master brake cylinder
(original)
>in a 57 3/4 t p/u to work even worse after being rebuilt?  I ask because
>mine was leaking fluid all over and had to be pumped up to work, but it
>would work some.  I rebuilt it using a kit from American Classic truck
>parts.  I had to hone it some as it had internal rust, and maybe that's the
>whole problem.  I didn't go excessive with the hone, and everything still
>seems tight.  Problem is that after rebuilding and bleeding about a qt of
>brake fluid through it (there is no air left in the lines!), it has
>absolutely no resistance in the pedal!  I tore it apart again, and started
>the whole procedure over with the same results the 2nd time.  I've ordered
>another rebuild kit from a local parts house, but I'm not overly
optimistic.
>I've double checked the shop manual, bled the cylinder before and after
>installing, used the proper bleeding sequence (RR, LR, RF, LF), and now I'm
>lost.  I hate to give up and order another cylinder because I'm not that
bad
>a mechanic, I actually enjoy rebuilding things (sometimes) and I can tend
to
>be a little (my version, not my wife's) stubborn.  Any of you more
>experienced types, I'd appreciate any suggestions!
>
>Jim Phipps
>57 3604
>
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>

oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959

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