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Old 12-08-2005, 04:33 PM
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Can a guy use a disc/disc master with drum rear?

Been scrounging parts for a 57 Fairlane I'm going to start building when spring gets here. This car was completely missing the rear end and springs. Have an 82 Conti parts car with 7.5 disc equiped 3:00 open rear end and was seriously thinking of putting it under the Fairlane. Also have a 3:00 open 8" out of a 64 V8 Sprint that I was thinking of building. Found spring hangers for the Fairlane and then found the leafs from a 59 wagon (wrecked in 1964 with 42k miles and had been sitting in the desert since)... Surprise,, it came with the original 9" rear end that's tagged "L-3:10" which I assume is a 3:10 locker large bearing (because it's from a wagon). Just goes to show that good things happen to guys who have patience and can wait for jewels to come our way.

Just what was needed for the Fairlane...

I'm going to disc the front of the car and want to use the hydro boost with disc/disc master from the Continental. Right now I think I would rather not convert the rear to discs, if only to be able to keep the original emergency brakes. I figure this Fairlane would still stop plenty good with discs on the front and the big wagon drums in the rear but wonder about the Conti disc/disc master cylinder. I know that when guys convert to discs they also have to convert to the disc master cylinder. Does anyone have any expierence and could tell me if I could use the disc master with the rear drums if I plumbed in an adjustable proportioning valve and a 10 pound residual valve?
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Old 12-08-2005, 05:08 PM
Will I ever get it done?

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Drum brake wheel cylinder seals do not provide positive sealing to prevent air from entering the wheel cylinder from the outside. Therefore, drum brake master cylinders have residual pressure valves in them which maintain a line pressure of approximately 10 psig. This is enough to keep the seals sealed and the air out. The return springs are strong enough to prevent the shoes from applying. Disc brake seals are different. They seal in both directions. And there are no return springs, so a residual pressure might cause the pads to drag, resulting in premature wear. The exception would be a hot rod where the master cylinder is under the floor. In that case, if the calipers are above the mc, the fluid will tend to drain back into the mc, causing a low pedal at the next apply. In that case, they make a 2 psig residual pressure valve to prevent this from occurring. The good news is that you can buy 10 psi residual pressure valves to go in line to your rear drum brakes.
There are others, but here are some places to get them.
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