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The worst thing water in the system does is freeze in the winter. On a M35 you'll only loose brake boost if it freezes. On civilian trucks will full air brakes, you can loose all your brakes.

It's in the -10 operators manual. Most trucks also have it stenciled near the air tanks and/or on the dash or doors.

If your truck only goes down to 30psi overnight I'd say your truck holds air better than 99% of the other trucks out there. These trucks leak air. The amount of leak you describe is well below the minimum leak down standards in the DOT laws. I hate to say this but you really need to read the TM...