Dual chamber master cylinder for drum brakes

[40 Deluxe]

Originally Posted by KULTULZ

Nah, you're OK. Brake valving is a fairly complicated subject, especially considering all the different circuit designs used.

The question is, do you have a PPV on your new system? And did the replacement MC come with an internal PRV and how was the new system was plumbed?

Well, the new master has internal residual valve for the rear, but no proportioning valve in the system. I have a 9" rear out of a '59 Galaxie which has smaller brake shoes than the original Cougar shoes. I get on the brakes fairly hard after a 110 MPH run down the strip and braking action feels fine; no tendency to swap ends.

[KULTULZ]

Originally Posted by 40 Deluxe

Well, the new master has internal residual valve for the rear, but no proportioning valve in the system.

I have a 9" rear out of a '59 Galaxie which has smaller brake shoes than the original Cougar shoes. I get on the brakes fairly hard after a 110 MPH run down the strip and braking action feels fine; no tendency to swap ends.

How did the car come through, with a SB or FE? It had KH 4 PISTON DISC on the front? 8" rear assy?

If the rear shoes are smaller (you would have to cipher swept area) it may explain the not needing a PPV. It is not supplying the braking force as OEM design. Is this a strip or street/strip car?

But then again, you have never had to dynamite the brakes if someone runs a red light in front of you on a slick road surface ...

[40 Deluxe]

Originally Posted by KULTULZ

How did the car come through, with a SB or FE? It had KH 4 PISTON DISC on the front? 8" rear assy?

If the rear shoes are smaller (you would have to cipher swept area) it may explain the not needing a PPV. It is not supplying the braking force as OEM design. Is this a strip or street/strip car?

But then again, you have never had to dynamite the brakes if someone runs a red light in front of you on a slick road surface ...

It's still the original 289 (well, the crank and block are). The calipers are the 4 piston and the original rear was the 8". Currently it's only run at the strip. And true, I haven't made a panic stop on a slick road. it could get hairy, especially with drag radials with minimal tread (they are DOT legal for use on public roads!).

[KULTULZ]

THANX! for the info, appreciate it.