Here's a pictures of the air and hydraulic lines of a split-circuit brake system fitted to some M35A2 trucks. I'm guessing the lines are similarly laid out on single-circuit brake trucks until one gets into the split-circuit components.
So three things:
1) Do the brakes on your truck work? If the air assist system is working right, it shouldn't require too much force to work the brakes.
2) What year is your truck? Does it have single-circuit brakes?
3) I don't know of an air diagram specifically for the single-circuit...
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