Hi Bob; no problem; I'll take a few pictures when I get it apart.
hopefully this rebuild kit will work. I'll call British Car Specialists on
Monday. I sure would like to replace the diaprahm as long as I'm in there.
On the Stag kit, it had the diaphram, but the drums are a different
diameter.
I've drained at least a pint of brake fluid out of it so far, and there is
still quite a bit sloshing around inside.
Frank
----- Original Message -----
From: "Bob Spidell" <bspidell@comcast.net>
To: "Frank Magnusson" <fmags@cox.net>
Cc: <healeys@autox.team.net>
Sent: Saturday, September 13, 2008 2:24 PM
Subject: Re: [Healeys] Brake servo repair - Pt. 2
> <continued>
>
>
> The main difference between the two types of servos--besides their
> construction--is that the (semi-) sealed unit uses a metal piston with a
> rubber diaphragm instead of the metal piston with leather/rubber seal
> around the edge. This is either a) a better way to do it, b) cheaper, c)
> neither or d) both (my guess is "b"). I have a feeling this type is
> meant to be replaced rather than rebuilt.
>
> The other is a slight difference in the externals and internals of the
> body (note there are two cylinders: a slave which is used to operate a
> valve which gates either atmospheric air or vacuum (non-braked condition)
> to the vacuum chamber, and the M/C, which applies the pressure to the
> wheel cylinders). On the metal/leather/rubber piston-type unit, the tip
> of the "conrod" from the vacuum piston seals the M/C piston when brakes
> are applied and releases allowing fluid to back-flow when brakes are
> released. On the diaphragm-type, there is a small ball bearing which I
> believe is part of this check-valve setup. Here comes the favor: when I
> disassembled my unit, the check-valve fell out and I didn't see EXACTLY
> how it is installed so, if you do get your unit apart watch carefully for
> the location of this ball bearing and please, let me know where it goes.
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