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might be more funner for us if you can take some pics of undersurface of truck near master cylinder. believe just below and medial to master cylinder. All kinds of cool stuff under there, I usually will test for loose bolts and fittings etc by banging different parts of my head against them...

Not aware of any other possibities unless it was a remote brake fluid reservoir. Brakes would work if opening is capped but run risk of pressure building up in master cylinder and blowing a seal if there was no pressure relief, if left open it will get dirt in master cylinder which would seem...

probably a vent line, should be a line with a T on the frame crossmember nearby that it is supposed to hook into........