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K_D 10-16-2009 12:22:11 155.39.88.241 32961 Report to Moderator	I"m looking for all the brake / hydraulic guru"s out there. I have a 1950 1.5 ton that needs a master brake cylinder. I"m thinking that rather than to just replace it, to upgrade to a dual master. There is a little room to put a larger one in (there is steering and starter in the same area as the master). My question is, if I were to upgrade to a dual master, the OEM master is a 1.5 inch single piston, do I have to use a 1.5 inch piston on a dual cylinder..? What happens if I use a smaller or larger piston master..? If anyone knows of a bolt on master that is a dual, please let me know. thanks K [Reply]  [Send Email]
Buzzman72 10-17-2009 11:20:59 74.129.194.33 32977 Report to Moderator	Re: Brake Master Cylinder in reply to K_D, 10-16-2009 12:22:11   Think about it this way: your brakes are activated by moving a certain volume of fluid at a certain pressure over a certain distance. Since the distance is fixed, there"s nothing you can do about that factor. So if you go to a smaller diameter master cylinder, you have to have a longer stroke of the master cylinder piston, or you will lose volume of fluid moved per stroke of the pedal. And since you can"t change the length of the pedal stroke [assuming you use the stock pedal], your brakes simply won"t function as well...if they function at all..using a master cylinder with a smaller-diameter piston. And just adding a booster won"t add to the volume of fluid moved. If you use a master cylinder with a larger piston, you"ll move more brake fluid volume per pedal stroke...meaning it"ll take less pedal for the same braking action, but there also comes a point of diminishing returns...that is, too much fluid moved in too short of a pedal stroke will make it more difficult to slow down without locking the brakes...making any "improvement" more of a PITA than it"s worth.   [Reply]  [No Email]
CCer 10-16-2009 18:43:15 207.255.87.223 32965 Report to Moderator	Re: Brake Master Cylinder in reply to K_D, 10-16-2009 12:22:11   There are kits for your idea. Some mount on the frame, with modified linkage. Some convert to swing pedal, and mount on the firewall. Try a search for brake booster assembly. Try www. stovebolt.com Ebay lists some kits.   [Reply]  [No Email]