I had the same issue with my '71 GT.
Leakage can be solved by replacing the two o-rings in the internals of the
switch assy.
Lo cost and no brake fluid should pass near the actual switch.
After this action you've got to blead all air out of the system.
Anyone: I still look for the electrical part of the switch assy - NLA?
Cheers,
Hans
----- Original Message -----
From: "Max Heim" <max_heim@sbcglobal.net>
To: "MG List" <mgs@autox.team.net>
Sent: Thursday, August 11, 2005 8:09 PM
Subject: Re: Brake fluid leaking
> OK, we seem to be talking about different things. I am talking about the
> brake light pressure switch, which on a Mark I B is about a $25 item.
>
>
> --
>
> Max Heim
> '66 MGB GHN3L76149
> If you're near Mountain View, CA,
> it's the primer red one with chrome wires
>
>
> on 8/11/05 9:45 AM, Councill, David at dcouncill@msubillings.edu wrote:
>
>> I seem to recall someone else on the list having this problem or
>> something like it a year or two ago. But I didn't quite understand his
>> final solution because it had something to do with not putting it
>> together correctly and/or using the wrong pipe to port connection (maybe
>> the center plug??). Maybe someone else will recall.
>>
>> When I reassembled my brake lines on my newly repainted black tulip 72B,
>> I was paranoid enough to put plastic under the switch area until I was
>> sure it would not leak. And it didn't.
>>
>> But if it was leaking as described here, I would probably put some paper
>> underneath so the actual leak source could be pinpointed. Maybe one of
>> the fittings is leaking and not sealing correctly. I'm still using the
>> original switch from my 71BGT in the 72, and I still have the original
>> switch from the 72. I didn't use it because it had some paint overspray
>> (green) from the DPO.
>>
>> I certainly hope they are not short lived and that my spare is good. A
>> quick check with Moss shows that part sells for more than $500!!
>>
>> David Councill
>> 67 BGT
>> 72 B
>> dcouncill@msubillings.edu
>>
>>
>> -----Original Message-----
>> From: owner-mgs@autox.team.net [mailto:owner-mgs@autox.team.net] On
>> Behalf Of Max Heim
>> Sent: Thursday, August 11, 2005 10:18 AM
>> To: MG List
>> Subject: Re: Brake fluid leaking
>>
>> I suppose there is some chance the paint dissolution is due to residue
>> of
>> brake fluid in that location from some previous time (when the pressure
>> switch was removed/replaced). If you are seeing liquid brake fluid now,
>> then
>> it is obviously leaking, and should be replaced before it starts
>> generating
>> symptoms. These switches are notoriously short-lived.
>>
>> --
>>
>> Max Heim
>> '66 MGB GHN3L76149
>> If you're near Mountain View, CA,
>> it's the primer red one with chrome wires
>>
>>
>>
>> on 8/11/05 8:32 AM, Tom Buchanan at toms_MG@tombuchanan.net wrote:
>>
>>> The pressure switch and/or body assembly (Moss part number 141-710) is
>>> seeping and disolving the body paint right beneath it. Very upsetting
>> since
>>> I have just had the car painted I can see no dripping or spraying of
>> brake
>>> fluid. Also the car's brakes seem to work fine. Hard pedal. Has anyone
>>> experienced this or have a solution?
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