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Old 09-27-2004, 08:41 PM
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Master cylinder: Disc/drum vs. drum/drum

Can someone tell me what generally is the difference between a disc/drum vs. drum/drum master cylinder, and why you shouldn't use a disc/drum master cylinder on an all-drum vehicle? What problems might you encounter in braking?

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Old 09-27-2004, 08:47 PM
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my current understanding s the drum/drum uses ten pound residual valves, which keep the drum line pressure up, the disc/ drum uses a 2 pound and a ten pound residual valve. 2 for the disc and ten for the drum, the 2 # won't provide enough pressure to properly actuate the drums wheel cylinders.

if i ever get the do ra me for the wilwood 10# residual valves, i'll let you know if i'm wrong or not....
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Old 09-27-2004, 08:49 PM
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One master cylinder uses a larger piston bore than the other.

Vince
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Old 09-27-2004, 11:50 PM
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I've seen many disk/drum where the bore is identical. They have a bigger resevour for the fronts because the calipers hold more fluid as the pads wear down and the pistons extend and stay that way. Different bores would create different pressures front to back and the average failure switch would trip immediately.
I have a motorhome with a disk/drum master cylinder from the factory on a drum/drum chassis. I'm happy about that because it will make putting on the conversion kit a lot easier.
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Old 09-28-2004, 03:46 PM
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Disc brakes require more fluid to actuate the brakes as drum brakes require less pressure and less fluid that is why you have a different master cylinder.

As far as problems when braking i really cant think of any besides the fact that only your front drum brakes will be getting the work out when stopping and your rears will not get enough pressure to work properly anyways

Disc brakes require more fluid to actuate the brakes as drum brakes require less pressure and less fluid that is why you have a different master cylinder.

As far as problems when braking i really cant think of any besides the fact that only your front drum brakes will be getting the work out when stopping and your rears will not get enough pressure to work properly anyways

right?

Disc brakes require more fluid to actuate the brakes as drum brakes require less pressure and less fluid that is why you have a different master cylinder.

As far as problems when braking i really cant think of any besides the fact that only your front drum brakes will be getting the work out when stopping and your rears will not get enough pressure to work properly anyways

right?
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