[JimBC66]

Hello,
I’m upgrading my 66 GTO to disc brakes off a ‘71 malibu.
I have a proportioning valve from a ‘73 El Camino, disc/drum. I believe is a G-body.
The rear brake cylinders are ‘66 GTO, I thing are a different diameter then the ‘71 Malibu.
Can I use the ‘73 El Camino proportioning valve with this application?
Should I look at adding an adjustable prop valve?
Should I change out the rear brake cylinders to ‘71 Malibu, if it’s a different size.
Pads, rotors, discs& hose are all new.
Also new is the ‘71 master cyl & booster. (Don’t know the length of the pushrod)
Do I have to educate myself better on Pascal’s Law ?
Thanks for the input.


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[Keith Seymore]

If originality/appearance is not a concern - I'd jump straight to an adjustable valve.

Prop valves are tuned for each individual application, varying the holdoff, meter, split and slope pressures, based on vehicle wheelbase, CG location, and piston/wheel cylinder diameters.

Buying a random prop valve and expecting it to work is a bit like buying a random carburetor and expecting it to work, without knowing anything about the idle settings, jets or other tuning considerations.

K

[Keith Seymore]

Originally Posted by JimBC66

I have a proportioning valve from a ‘73 El Camino, disc/drum. I believe is a G-body.

'73 El Camino is A body.

K