I hope this works
I have a 50 3/4 ton which was just updated to dual cylinders etc,etc, on drum drum.
Try this post below.
It contains a lot of information on 3 pages of help and explanation to needs v/s requirments.


https://www.stovebolt.com/ubbthreads/ubbthreads.php/ubb/showflat/Number/241789/fpart/1



I really learned alot about my brakes, resistors, portioning valves, etc..

Hope you can get as much help out of it as I did.

Last edited by Shellology; 02/11/2008 2:22 AM.
I'm slow, but consistent........consistently slow!

Loy, 1950 Chevy 3600 3/4-Ton

http://s522.photobucket.com/user/Shellology/library/1950%20Chevy%20Truck?sort=3&page=1