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Actually drum brakes still have there place. Our busses still use drum brakes. In the 1990's we did try to use disc brakes on the busses. It was a failure. Industry wide on large trucks they have gone back to drum brakes. One of the reasons is the amount of pressure needed to stop a disc rotor...

The only problem now is how are you going to apply all the calipers at the same time with mechanical linkages ?

There are trucks that use a caliper as the parking brake ( in fact some of our "Ford baby busses" used them) . The park lever pulls a cable that actuates a cam-over block that presses on the caliper ( picture a large vise-grip). I have worked on them before. Pretty simple, but I wouldn't trust...

Aaron check out this site. At work we had these on our older 40ft busses. They can almost bring a fully loaded bus to a complete stop. They make them for all kinds of applications. http://www.telmausa.com/products/operating-principle