[Healeys] PBR brake servo

Alan Seigrist healey.nut at gmail.com
Tue May 31 18:17:38 MDT 2022

Hi Stephen -

I believe the "diaphragm collar" undscrews from the "push rod".  There
should be a hole in the pushrod shaft somewhere, where you can place a
small diameter screwdriver or punch then hold the pushrod still while you
unscrew the diaphragm collar.

I could be wrong but I think that's how it is done on the PBR.  On the
Delphi/Lockheed unit you peel back the diaphragm and theres a metal sleeve
that you pull out... works very different to the PBR.



On Wed, Jun 1, 2022 at 1:40 AM Stephen Hutchings <s.hutchings at rogers.com>

> Hello everyone,
> I’ve had a PBR VH44 brake servo on my car for over 25 years, and I’ve
> found a source for a rebuild kit.
> I was looking to rebuild the unit, not because there’s anything wrong with
> it, but it's been in active service a long time, and I really don’t want to
> find out it’s failed the hard way.
> I use Dot 5 silicone fluid (please let’s not get into that controversy
> again!), and it would not be very good if that got sucked in to the engine
> via the manifold.
> Anyway, I wonder if anyone out there has rebuilt one of these units. I’ve
> attached a couple of photos - one of the opened unit, and a close up of the
> end of the shaft that goes into the cylinder bore.  I’m really not sure of
> how to release this gizmo…and I don’t want to bugger it up, of course.
> I will probably end up phoning the supplier in Australia (I’m in Canada),
> but I thought I’d check with the list first.
> Thanks,
> Stephen, BJ8
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