Re: WANTED: NOT-rebuildable BTV master cyl.

Posted by HH56 On 2009/5/18 21:29:57

with hydraulic brakes actually flush and change brake fluid every few years?

Very true but most brakes don't have the same mechanics. In most conventional master cylinders, the piston and cup physically move past the compensating port so there is no possible way for the fluid to leak back into reservoir. Hence the reason for pedal free play being so important. When relaxed, the piston has to be behind the port so fluid can return or be replenished. With BTV having no piston as such there is nothing to move past, so port is exposed all the time and relies on the valve.

I can't help but wonder about the layout of the BTV in the cars that don't have many issues. Do they all sit with the fairly steep angle as the Packard does?