poor braking

[Rory McNeil]

Like Larry said, at least on Fords, the manual brake cars came with a different brake pedal, with a pivot for the master cylinder pushrod closer to the pivot for the pedal itself, for more mechanical advantage. Again, with my Fords, manual master cylinders a re usually a smaller bore, like 7/8" or 15/16" diameter, compared to over 1" for a power brake application.

[Tom Goldman]

As was mentioned pedal ratio is critical .If the car originally had power brakes the ratio was only around 4 to 1 ,a ratio of 6 to 1 is considered ideal . also ,If you are only using discs on the front and retained the drums on the rear ,a master cylinder with a smaller bore will help.
On a disc /drum car I usually use a 1 3/32 bore master cylinder which wit the 6 to 1 pedal usually will yield around 1000 psi with reasonable pedal pressure.

[Gmirza]

On my ‘71 Duster, I used an aluminum master cylinder that came on the Volare/Aspens. I have Strange fronts and stock 10” rear drums and factory proportioning valve also from Volare/Aspen. Never a problem stopping or holding the car. You could have a bad brake hose or a stuck caliper. Make sure too use the braided front brake hoses.

[Doug Domm]

Originally Posted by Gmirza

On my ‘71 Duster, I used an aluminum master cylinder that came on the Volare/Aspens. I have Strange fronts and stock 10” rear drums and factory proportioning valve also from Volare/Aspen. Never a problem stopping or holding the car. You could have a bad brake hose or a stuck caliper. Make sure too use the braided front brake hoses.

Any particular reason to only use braided front brake hoses?

[GTX JOHN]

All our A bodies have 7/8 or 15/16 Cylinders
The large one would not let my elder legs hold
the two step or stop quickly.
We try for 7:1 and sometimes redrill the brake petal
itself and relocate the master if need on several of our
different stockers. Particularly on the two Aspens F Body cars.

You will figure it out.
PM me if needed.

[GTX JOHN]

The rubber fatigues and expands producing
a spongy petal.

At a minimum replace the stock lines every few
years.

[back for more]

thanks for the info does anyone have the part number for the volarie style master cylinder? would i be better off going back to the stock master cylinder? also i was told to delete the proporting valve all together was that a bad idea?

[Larry Hill]

I race the Cuda without the valve.

[Gmirza]

Originally Posted by back for more

thanks for the info does anyone have the part number for the volarie style master cylinder? would i be better off going back to the stock master cylinder? also i was told to delete the proporting valve all together was that a bad idea?

You can look up the part number on Rock Auto.
This is a dumb question, but do you have the lines hooked up to the proper ports on the master cylinder? Front to the rear and rear to the front.
Did the car have a power booster in it originally? Like someone else said in an earlier reply, the pedal ratio could be the issue.

[back for more]

thanks for all the info parts are ordered