Problem with brass body proportioning valve

> > I changed my Combination/Proportioning valve back in 2005 when I did the whole braking system. At that time that "valve" was the old steel one
> > and was quite rusty, so got one from, IIRC, Applied GMC. It was Brass, so I felt I had to check it for the proportioning rubber plug. I did it
> > while installed on the coach. First thing I did was make sure the master cylinder was full and then put the proportioning valve bleed tool for
> > holding to the differential spool valve in place. Then remove the brake line going to the rear wheels, and capped the line off with a inverted
> > flare cap. With fluid trickling out of the combination valve, using a mirror and a flashlight, looked up the valve for the rubber plug and spring.
> > NOT THERE!! So I put it back together and bled the line. Apparently some of the brass ones sold back in the early 2000's did not have that
> > proportioning spring and plug in them. So it is possible that some of you may have the correct brass "combination valve". IMO it is best to check
> > it anyway.
>
> Tom Pryor found out that the design for the PVMH has existed a long time and they believe some were made. You may have gotten one.
>
> Look underneath and see if it is stamped PVMH or PV2/4.
>
> Matt

Awwww Geese...do I have to? :( Maybe next time I have the front end up and the drivers side wheel and wheel well off.....

I was actually surprised that it the plug and spring were not there. I was under the impression from all of the talk about it, that ALL brass combo
valves had it....but...noooooo!!
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Larry
78 Royale w/500 Caddy
Menomonie, WI.
 
I just stuck my phone in and took a photo of the underside of the valve, looks like I have a shiny new PV2 courtesy of the previous owner's brother.
He did tell me he never got the rear brakes bled right either.
With the wheel and well liner out it doesn't look horrible to work on in place, I might try that first and see if there is indeed a rubber piston in
it, as I suspect there is.
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Burl Vibert
Kingston, Ontario
1976 GMC 26 foot, Sheridan reno, don't know original model but we call her Roxie