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I have a 57 custom cab F100. I am waiting on the shop manual to come but in the meantime maybe you guys could help. 1st Can I easily replace the two master cylinders with a modern one. What stops it from just being able to bolt a modern one on and running new lines? doesn't need to be a power system. 2nd question How do I go about lowering the truck a little. All is stock at the moment. I have been searching the threads for over a hour and cant find the answers. Thanks for all the help I have learned a lot from this forum.
One of the master cylinders is for the brakes. The other has nothing to do with the brakes, as it's the "hydraulic clutch master cylinder." It has a hose routing from it to the "hydraulic clutch slave cylinder."
Besides the shop manual, I suggest you get this: The 1957/63 Ford Truck Parts Catalog is available on a CD from hipoparts.com
I haven't welcomed you to FTE, where did I leave my manners. You found the best forum for our trucks... Welcome aboard!
Back to your question... How low do you want it? Easiest way to lower it is size of tires... and/or you can remove leaf springs (or take to a spring shop and have them build you some custom springs to the ride height you want).
I have a 57 custom cab F100. I am waiting on the shop manual to come but in the meantime maybe you guys could help. 1st Can I easily replace the two master cylinders with a modern one. What stops it from just being able to bolt a modern one on and running new lines? doesn't need to be a power system. 2nd question How do I go about lowering the truck a little. All is stock at the moment. I have been searching the threads for over a hour and cant find the answers. Thanks for all the help I have learned a lot from this forum.
As noted above, your two master cylinders do two, separate functions. Don't mess with the clutch master. The brakes can be upgraded easily using a m/c from a late 60's F-100 for manual drum brakes, if that's what you still have, to give you the safer, modern 2 circuit braking system. It can be sourced from any local, higher quality parts store, like NAPA. The biggest thing to be aware of is proper push rod clearance when installing. Beyond that, it's simply a matter of separating the lines so front and rear brakes lead to the different reservoirs. Originally, the rear reservior (closest to the firewall) went to the front brakes, and vice-versa.
You will also need the Brake Differential Proportioning Valve when swapping in a dual master cylinder, and you'll have to fabricate all new brake lines....a PITA.
1967: First year for dual master cylinders for Passenger Cars, F100/350's, Bronco's and Econolines.
1967 F100: The parts are 1967 ONLY! Use 1968/72 F100 2WD parts, 1973 and later F100 2WD's have discs.