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Re: [Mgs] Brake Master Cylinder

To: "Paul Hunt" <>, "Craig Straub"
Subject: Re: [Mgs] Brake Master Cylinder
From: "Hans Duinhoven" <>
Date: Wed, 23 Dec 2009 19:26:21 +0100
Is the reservoir tight fit?
Between the reservoir and the MC cyl are two O-rings.
If the leaking fluid comes from under the reservoir, it maybe, that the 
rings are missing or faulty.
Better check this out.
I assume it is regarding the dual tandem US spec. MC, which was used from 
1969 till some 1974.



P.S. Merry Christmas list!

----- Original Message ----- 
From: "Paul Hunt" <>
To: "Craig Straub" <>; <>
Sent: Wednesday, December 23, 2009 10:01 AM
Subject: Re: [Mgs] Brake Master Cylinder

> Leaks from where?  The banjo union?  If so reseal it.  The other end of 
> the cylinder where the push-rod goes in?  If so try pumping the pedal up 
> and down as fast as you can for as long as you can, which should soften up 
> the seals, if the weather is cold try warming up the cylinder first with a 
> hair drier or fan heater.  New cylinders and long layups with no fluid can 
> allow seals to dry out, harden and leak back when refilled.  A pal putting 
> his car back on the road after a couple of years had the main seal weeping 
> (gears intermittently graunching and baulking) until he tried this, which 
> very fortuitously was a tip published in that months issue of the MGOC 
> magazine.
> If it's leaking from anywhere else then it may be no good, although if 
> it's from between the reservoir and the cylinder you *may* be able to 
> solder it. I've had the reservoir corroded through in the past, but I 
> hardly think that is the cause on a new one.
> PaulH.
> ----- Original Message ----- 
>>I just put on a brand new brake master cylinder on my 1973 MGB.  I have 
>>had it on the shelf for the last two years.
>> The problem I have is that the master cylinder leaks.


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