I ordered a new hydrovac unit today, it should be in tomorrow. It looks like the old one was damaged and in pretty poor shape. I am pretty sure I have the dual piston brakes on front and not sure about the rear yet. How do I tell what they are and how do I go about adjusting them?
On a side note, I found the original 1963 Chevrolet Truck owners guide in a plastic envelope along with a 1977 Hazardous Materials Emergency Response Guide. Kinda neat!