Re: BRAKES: Easamatic Power Brakes aka Bendix Treadle-Vac--Change or Not??

Posted by PackardV8 On 2009/5/18 22:31:48

"why the BTV can use a 1:1 ratio with their setup. The diameter is virtually same 1", difference being piston"....

It is NOT a 1 inch piston!!!. YES, i know that the manual says 1". IT IS NOT ONE INCH!!! The piston is 0.655 inch diameter. THAT IS slightly more than 5/8 inch diameter.

Take one apart and measure it.

THe BTV is NOT a CUP TYPE cylinder. It is just 5/8 plunger that penetrates a 1" bore. They could have used a bore that is 1 mile in diameter or as small as 0.655 and would make NO difference because there is NO SEAL on the pluger EXCEDPT at he very rear of the housing.

IF u do not believe that it is NOT 1 inch i will take a picture of one and post it here. I have one apart on the bench right now.