Bob: Why not hone an aluminum bore?
Jim
----- Original Message -----
From: "Bob Spidell" <bspidell@comcast.net>
To: <scotyp@comcast.net>; "healey list" <healeys@autox.team.net>
Sent: Saturday, April 09, 2005 12:11 AM
Subject: Re: Brake Master Cylinder Leaking
> Hi Scot,
>
>
> You should be able to get to the MC by removing the air cleaners. You're
> right, there're just two bolts
> into the firewall, and the two lines. Use a flare nut wrench--the kind
> with the slot--to undo the pipe fittings
> if you have one. Remove the rubber boot inside the cockpit and pull the
> MC out.
>
> Disassemble the MC carefully, noting how everything is put together. It's
> pretty simple, the most
> complicated piece being the spring loaded "inner" piston that seals the
> return line to the reservoir.
> There's also a wavy spring behind the seal. BTW, when this little seal
> fails you lose all pedal
> immediately.
>
> Check out the bore of the MC. It should be mirror-smooth; look for any
> pitting and stick a finger into
> the bore and feel for any irregularities. If there is any pitting or
> scoring the bore will have to be sleeved
> or the MC replaced. I believe the MC in my car is aluminum, but I bought
> a new one that is steel.
> DO NOT attempt to hone an aluminum cylinder bore. Also check the
> condition of the threads and
> the mating surface for pipe flares ... any gouges or nicks where the pipe
> beds in and you probably
> won't be able to get a good seal.
>
> Rebuild kits run about $20, a re-sleeve will run $50-80 depending on who
> does
> it and what material is used (usually brass or stainless steel). New MCs
> run $150, but occasionally
> one of the Usual Suspects will put them on sale.
>
> Re-assembly is the opposite of disassembly ... but cleanliness is
> essential. Moisten all the innards
> with your brake fluid of choice--or some of the lube that comes with the
> rebuild kit--before assembly.
>
> BTW, what brake fluid are you using?
>
>
> bs
> ***************************************************************
> Bob Spidell San Jose, CA bspidell@comcast.net
> '67 Austin-Healey 3000 '56 Austin-Healey 100M
> ***************************************************************
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