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Routing of the front brake lines on HUPs is different from many of the
earlier CMPs. With a single rubber flex hose coming down from the chassis
to a distribution tube on the back side of the axle housing. Then to rubber
flex hoses at each knuckle to the brake cylinders. The other Chevy CMPs
had individual flex brake lines going directly from chassis to the brake
cylinders these had springs on them to hold them away from the wheel when
steering was turned hard over to one side or the other. As the service
bulletin below states this routing out in the open under the fenders was
subject to damage particularly from tire chains so the behind the axle
routing was a service modification. I suspect that this change was made
also to speed repairs because the routing of the steel brake line on the
other Chevy CMPs would be difficult to repair in the field as it runs
under the radiator and through the frame rails.
These two pages are excerpted from the Service Information Bulletins
(reprints
available from Alex Blair see links page) this is very interesting
summary of changes made to correct problems in the field. In it you will
find explanations for why things are not as they are shown in the manuals.
I have found server modifications that I had assumed were made after my
CMPs had left military service because they are not shown in the normal
CMP manuals, which in fact probably were done while the truck was in active
service.
Interesting feature of Chevy Stove Bolt Six that can be seen in all of
these picture. The self undercoating and rust prevention system. It would
seem that left to themselves vehicles equipped with these engine will
cover the underside of the truck in oil.
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