Re: Brake System Math


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Posted by Willy-N [72.168.160.156] on Sunday, December 13, 2015 at 21:14:36 :

In Reply to: Brake System Math posted by Greg Coffin [67.173.236.4] on Sunday, December 13, 2015 at 09:53:26 :

I did not measure the length of anything. I just put a tape on the floor to the pedal spot for your foot. It was around 11 inches from the floor and the pedal can go to the floor with no fluid in the master cylinder. On the master cylinder booster it uses up the whole movement except a tiny bit so it does not bottom out metal to metal inside the bore. There is about 1/2" of free play on the pedal before the master cylinder starts to move. So maybe 10 inches of travel moves the master cylinder rod about 1 1/4" - 1 1/2" full stroke. It will probley stop the truck long before it bottoms out but I need to put fluid in it to see how much inside pedal movement before a firm tight hydraulic stop. I used a 8" booster with a 1 1/4" bore and pretty much a original ratio so if I have no vacuum or the bellows crap out it shold work like regular brakes. I added a Vacuum Chamber for a reserve and hard lined the hose except short ends of hose for flex reasons. I also added a Vacuum Gauge under the dash hooked to the tank to make sure I was not in for a surprise! The Booster like at least 17 inch pounds of vacuum to work the best.



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