Your 2-speed works on vacuum-no need to bleed. no fluid,just air. There's a petcock on the vacuum manifold,that should be removed periodically,to check for blockage,due to condensation and normal build-up. This blockage could hinder the performance of both the hydrovac,and the 2-speed.System calls for between 18-21 P.S.I.,to operate correctly,(hydrovac spec's).Have you cracked/bled the wheel cylinders? any fluid? have you adjusted (All) the brake shoes? Have you replaced the rubber brake lines? They collapse from the inside,and will cut-off flow. We've been working on a '59 Viking 60 bus,with the same problem. P.O. parked it,after re-building the 261,installing a new hydrovac,and single-pot M.C. He couldn't figure the brakes out,so he GAVE it away!! Now it has a new dual reservoir M.C.,with booster,but still no brakes! Engine only produces between 8-10 P.S.I.,(vacuum),which is fine for an idle,but truck has virtually no power! Brake pedal is all the way up,and SOLID!! BAFFLING!! We bled the wheel cylinders,and fluid shoots 3',but brakes won't grab! Yeah,they're adjusted. I FINALLY got Billy W. convinced to replace ALL of his brake lines. We have our fingers BRAIDED! GOOD-LUCK!!
Last edited by wetwilly5757; 05/01/2014 8:25 AM.
