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I'll try to just add some info that could be helpful to both Disc engineering and those of us with stock drums. I'm not an expert on the Air Packs by any means, but I am under the impression that they only start assisting once the line pressure hits a certain point (probably right after the...

I probably wasn't too clear on this sorry. The dual circuit A2 and A3 trucks have a master cylinder with different output volume ratios. The reservoirs aren't really split, they do have an internal baffle that goes up halfway but that is just incase one circuit fails so the other circuit will...

The 87-89 M35a2 and the 93+ M35A3 trucks use a nearly identical master cylinder. Reservoir capacity is the same (although one is remote mounted), bore and stroke are the same, just a difference in volume split betweeen the two and residual pressure valves in one.

Well now I'm just confused. Maybe we are comparing apples to oranges or something. But I keep looking this stuff up after each post reply here and I'm still seeing every article telling me the opposite. I'm not saying your wrong, just saying EVERY article I have read is saying discs use more...

Well I don't want to argue but every article I have read is to the contrary. I just googled "disc drum brake volume" and they all say disc requires more fluid volume. Perhaps there is something unique about the Rockwell drums and discs that fit but I would be surprised. " Drum brakes will...

Im pretty sure it's the other way around. Disc brakes require more fluid volume than drum. Vehicles with disc in front and drum in rear need a split ratio master cylinder to put more fluid to the discs and less to the drums.