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#480054 12/08/2008 11:58 PM
Joined: Dec 2000
Posts: 506
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Installing disk brake kit on straight axle 52 1/2 ton Chevy. It already has a new manual drum/drum mc with 10/10 residual valves. Drum brakes are working ok, just want more stopping power so am adding disks up front. I think all I need to do is change the front residual to 2 and I'm, good to go? The mc is under the floor in the original location. The company I bought the kit from said I should be good to go with a 2 lb? However I read now that using a drum/drum manual mc with a disk brake will cause the disks to drag? Conflicting information. Thank you in advance.


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I believe master cylinders for discs have a larger reservoir for disc brakes.

some good info on drum brakes, disc brakes and master cylinders
http://www.piratejack.net/Tech-Support/FAQs-Master-Cylinders.html

Can I use my drum brake master for disc brakes?
No, for two reasons. First you will not have enough pressure or volume and second the drum brake master will have a residual valve that will cause the disc brakes to drag.

Last edited by drummin52; 12/09/2008 3:13 AM.
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Drum/drum masters normally have built-in residual valves with equal chambers. You'll need to get a disc/drum master and add a 2 lb to the front and a 10 lb to the rear. A good source for planning your brake system:

http://www.ecihotrodbrakes.com

http://www.MPbrakes.com

http://classicperform.com

Dave


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