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Old 02-13-2014, 11:16 PM
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Disc/drum brake conversion manual master cylinder pressure valves

So I have researched the topic for months now. With not much experience with braking systems... I am now more confused than ever. I'm going to start off by posting my question before I tell my story and explain how I ended up where I am.
Qt. How can you tell if a manual disc/drum master cylinder has residual valves built in? I plan on using a '76 Ford Granada master for a manual disc/drum car with .937 bore

I'm converting a Manual drum drum single chamber master cylinder car (1940 mopar) to a front disc (using 1990 chevy celebrity calipers) And rear drum (1973 b body mopar rear) and dual chamber non power master cylinder.
Before I installed disc on the front I had installed a dual drum drum mc from a late 60's mustang and it worked great.

I researched and found out that these year mustangs front disc or drum and non power used the same MC but required the use of a prop valve.
Instead of looking for the prop valve im experiment with a different disc/drum manual MC. ( the '76 Granada mentioned above) in hopes of possibly eliminating the need for prop valve?

2nd question; I'f I used 2lb and 10lb residual valves with this mc do I still need to use a prop valve?

Should I use both prop valves and residual valves ?

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Last edited by 67Elcamino; 02-13-2014 at 11:39 PM.
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Old 02-14-2014, 12:50 AM
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I'm not a brake expert but I just completed a similar conversion on my Chevelle. You do need a 10lb. residual valve to the rear drums. It needs to be there to hold pressure to the drum brakes so the brake springs wont push the fluid back to the master cylinder when you release your foot from the brake pedal. The only time you need a 2lb. residual valve to the front disks is when the master cylinder is mounted lower than the disk brake calipers. the '76 Granada master cylinder should have the 10lb. residual valve internally in it in the drum brake cylinder. You do need a porp valve to regulate the pressure between the disk and drum brakes. I would recommend that you use an adjustable one. You can get them from most parts suppliers like summit, jegs, speedway motors etc. Just follow the instructions on how to adjust it.
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