Friend installed a drum/drum dual reservour M.C.,in a '59 Viking bus recently. he couldn't get brake pressure to the rear,even with "solid pedal". He took it to a nearby shop,that does brake work regularly. They removed the rear drums,and nothing was broken,and even had like-new shoes! mechanic applied 100# of pressure to the rear cylinders,and got minimal results! None of the lines are clogged! he purchased his under-floor M.C. from one of the reputable parts suppliers,but it's designed for pick-ups,not the 1-1/2-2-tons. The bore is smaller. I suggested a proportioning valve,but that wouldn't help,if 100# pressure barely moves the rear wheel cylinders! Bus is parked,until brake problem is remedied. This is the reason the bus got parked in the first place-same problem with a stock M.C. Really puzzling!
Last edited by wetwilly5757; 10/02/2013 4:49 AM.
