Any feedback about PrimoClassics for brake valve?

[pauls340]

I just found the webpage www.primoclassics.com for an exact (claims) copy of the '71 prop valve for a disc/ drum brake setup. Does anyone have any feedback on Primo or the prop valve? Every other valve seems to be brass.

 

[slantsixdan]

There were multiple different combination valves in '71, and the one they're showing is not correct for an A-body. Here is the one you need, from Inline Tube. While you have the hydraulics all apart on your car, take the opportunity to swap in a pair of 13/16"-bore rear wheel cylinders to replace the 15/16"-bore ones. You'll be very happy to have done so; this greatly reduces the tendency for premature rear brake lockup on A-bodies with front disc brakes. See here and here. NAPA-United 37696. Raybestos WC37696. Wagner F113704. ACDelco 18E268 are P/Ns for those cylinders.

 

[pauls340]

Thanks Slant, it sounds as though you know what you're talkin about

 

[slantsixdan]

Thanks Slant, it sounds as though you know what you're talkin about

Not me, I'm fulla baloney!

 

[swing69]

simple math really. smaller bore, same line pressure, equals less brake force.
(Dan is a mountain of knowledge for sure!! - - part numbers and all !!)

This is why I'm often wondering why people who put 8.75s under A bodies also put 11x2.5 drums when 10x2.5 are more plentiful AND more appropriate....