[Mgs] 1973 Brake system pressure warning switch

[Stephen West-Fisher]

It's been a number of years ago but I did get a rebuild kit and new switch.
In fact, since only one vendor had the switch I bout two just in case. No
problems with the rebuild, but I didn't have any problems getting it apart.
The only thing I can recommend is more soaking, block off the two front and
one rear ports as well as where the switch was and try your air pressure. I
don't generally recommend air pressure on stuff like this due to flying
parts that then disappear, but sometimes drastic measures may be required.

You are sure ALL the switch parts came out aren't you? If the switch plunger
is stuck in the shuttle that could hold it in.

--
Stephen West-Fisher
N4IK
-----Original Message-----
From: mgs-bounces at autox.team.net [mailto:mgs-bounces at autox.team.net] On
Behalf Of Philip Jones
Sent: Monday, July 23, 2012 2:16 AM
To: mgs at autox.team.net
Subject: [Mgs] 1973 Brake system pressure warning switch

Hi John.  

I don't think that I'm really qualified to be helpful . . . but I was not
under the impression that these can be rebuilt!  I don't know too much about
the innards, but I understand that there's a "shuttle" (maybe that's the rod
that you are referring to) that moves back and (or) forth based on which
brake circuit loses pressure.  My impression was that the shuttle was
"captive".  I didn't think that there were internal seals - I thought all
the sealing was done via the pipe threads connecting to brake lines to the
unit.  I have also heard that the replacement switches are of dubious
quality.