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In general disc brakes stop better because for a given application, the disc will have more contact area than the drum. Of course you could try shoving a HUGE drum system onto the truck until you exceed the area of the disc you are using, but not fair comparison though.
The spec you need to know for servicing the brakes is the service spec, not the minimum spec. If the pads are replaced and the rotors are below the service spec, it means the rotors will go below minimum spec before the pads are worn out. Service spec is generally .5 or .6 mm thicker than the minimum spec and is found in the maintenance manual or WIS.
Gilly
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