Gerard,
Thanks for your input. This car didn't have the
proportioning valve in the system. Just a line
connected to the master for the fronts and a line
running to the rears. No one has said that "yes it
must be on the car" but after studing the master
cylinder cross section and having rebuilt several I am
begining to think that it has to be in the system. I
believe that the valve of the front system needs the
pressure from the closed off section of the proportion
valve to actuate the rear system in the master. There
isn't a solid push rod all the way thru the master but
2 rods connected by pins and a spring, sort of a
proportioning valve in itself? The pressure from the
front part, after starting to actuate the discs, then
pushes the rear rod and valve forcing the rears to
start doing their job. If you have a pressure failure
in the front system, as my friend did, the rears won't
work if the PDWA isn't there to shut off the front
line. In the other case were the rears fail, there
isn't enough difference in normal every day braking
for the average driver to notice thus the inclusion of
the warning light in the PDWA system.
Imput?????????
Bob
--- Gerard <pixelsmith@gerardsgarage.com> wrote:
> Cap'n (and others following this discussion),
>
> Nope, not diagonal. Circuits are front and rear and
> probably set up the
> same way front and rear without the valve.
>
> Also, I don't think the system is designed to
> conpensate for a leak, but
> rather a loss of pressure.
>
> The proprtioning valve has 5 connections, two from
> the MC, one to each
> front wheel and on out to the rear tee. One MC line
> feeds the front and the
> other the rear and front and rear are supplied from
> corresponding feeds. If
> pressure drops from one supply, it will force the
> shuttle valve to pop to
> the weak side allowing fluid to supply both
> branches. Unless someone can
> explin otherwise, I think you are still in trouble
> if you spring a leak
> somewhere.
>
> My vintage race Bugeye came equipped with the tandem
> system WITHOUT the
> proportioning valve. Because is leaked a bit when I
> got it, I removed it to
> rebuild it. What I dicovered was that whoever
> rebuilt it before never
> connected the link pin between the front and rear
> pistons. That also
> explained why I could never bleed the rear brakes
> and what made me
> suspicious as well. That means that my friend had
> raced ot the whole time
> with FRONT BRAKES ONLY! So much for how much the
> rears do, eh?
>
> At 7:09 AM -0400 5/15/03, Robert E. Shlafer wrote:
> >Bob...
> >
> >As far as I know, each channel works
> >diagonally front to back and includes
> >one wheel from each side.
> >
> >'Course, I do not know how your buddy's
> >race car was rigged.....
> >
> >
> >
> >
> >Cap'n. Bob
> > '60 :{)
>
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