Robert, I don't know how much things changed but I have a ' 50 300 which is
a 2 1/2 ton. I think yours might be a three ton unless they changed the
numbering system. My brakes need to be bled with a pressure bleeder
otherwise you can't get out all the air. Parts are not easy to come by for
bigger trucks, especially GMC's. There is a place in Pittsburgh I believe
that does Hydrovac rebuilds, You can email if you want me to look them up
for you.
John Mercier
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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