Re: Bendix Treadle Vac, Myths, Fiction and Facts

Posted by fredkanter On 2017/2/22 16:27:31

HH56,

The mode of failure could be low fluid caused by fluid leaking by the primary seal. Upon using the pedal again the fluid could reach the reservoir via the return passage.



This is the important passage that some rebuilders fill with silicone as they do not understand the system

The contour of the rubber on the compensating valve is important, allowing a good seal. As you note there have been some incorrectly reproduced valves used by some rebuilders which do not seal reliably. Thus is not the fault of Bendix design engineers or the design or age of the unit, it is the fault of whomever reproduced the part.

If someone reproduces engine pistons that have too much clearance and are made of the wrong alloy and the engine burns oil so much that it runs low and the engine seizes it is not the fauilt of Packard engineers.