Quote:
the rod or ram never touches anywhere except the seal surrounding the shaft at the rear. As soon as the ram leaves the rear or relaxed position, a spring closes the compensator valve tightly. However, because the ram doesn't touch the walls the opening is still available and if the valve or blob of rubber should leak, fluid can exit. If that valve is closed, the fluid is trapped by the valve, shaft seal and is pressurized by the ram moving into the cylindrical chamber. Because the fluid is confined, it can only be displaced by the relatively large ram and forced out to the wheels.
Is this knew term "ram" just a synonymn for the long rod connected to the brake pedal at one end, extending through the rear plate of the vacuum cylinder (the part with the vacuum connections and the hose) and thence through what I have called the "vacuum piston" and finally through the other end of the vacuum cylinder? If so, then I would just call it a "rod" until you get to the part that enters the master cylinder, where I'd say the term "ram" might work all right, since it is "ramming" the fluid, but really I'd say calling that part a "piston" seems more likely to be understood.
When I get to see the captions on the drawings in the '55 manual, I think this will all be clearer to me.
Was Packard Bendix's first customer for the BTV? Were the BTV units or other types of power brakes used in other vehicles?
Maybe I better check Wikipedia!
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