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Re: Brake Master Cylinder Leaking

To: "Bob Spidell" <bspidell@comcast.net>, <scotyp@comcast.net>,
Subject: Re: Brake Master Cylinder Leaking
From: "Bluechipracing" <bluechipracing@snet.net>
Date: Sat, 9 Apr 2005 17:56:37 -0400
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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