Re: BRAKES: Easamatic Power Brakes aka Bendix Treadle-Vac--Change or Not??
Posted by HH56 On 2009/5/19 8:23:36
Quote:
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.
Yes, I know-very familiar with them. Bad choice of words in calling it a cylinder. But still doesn't explain why they can get away with the 1:1 when all others want at least 3:1. Only reason I can see is the length vs diameter. Like a hydraulic jack principle--A little displacement in a longer distance would squeeze the fluid out & need less pressure than a larger piston would. Would be interesting to connect a pressure gauge and see what is developed. The PB stores say a conventional drum setup needs around 1500psi on large cars.
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