Master cylinder sizing
 

I need some input about master cylinder sizing. I had installed an ssbc disc conversion on my 66 plymouth. I have the master still on car that came with kit but size is unknown, but is late 60's master for disc /drum car.i changed spindles to a later year to take advantage of bigger stock rotors and add first gen viper/brembo calipers . I was wanting to change out my master to a wilwood unit and not sure which would be best.what do i need to know in order to choose the right one.

I'd call Wilwood, my guess is they will talk you into a dual master cylinder setup so the front and rear can be changed according to pedal feel. If your wanting to stick with just 1 master then maybe get a master that was for a f/r disc brake car and add a proportion inn valve on the rear line to control lock up.

I have manual brakes and from the research i did, it seems a 1" master is preferred. I figure everyone on here has to setup a brake system at some point so some real world input on what works and what dont is what im hoping to hear

Tobin at Kore3 would have all the info and parts you'd need.... He's a sponsor here on Lat G and really knows his brakes.


Wilwood 7/8" is what I prefer for MANUAL disc brakes.... but you will also need a proportioning valve if you're running Disc/Disc. That will need to be installed for the rear brakes and they have a kit which has a mount and the valve all inclusive.


Wilwood 1" will give you a softer pedal -- some racer types like the softer pedal for "modulating" the brakes -- but it makes LESS pressure. I prefer a firm pedal on the street and as much pressure as I can make with as little effort.

Make certain your PEDAL is a MANUAL pedal ratio! You need 6 or 7 to 1 ratio in order for these setups to work properly. If you don't know what this is - just google Brake pedal ratio or go on Wilwoods site... they have it well documented.

Greg I think actually the 1" will make the feel harder than a 7/8 bore.
less travel as well. (depending on the ratio of course) we always use a 1" with manual brakes it seems to work well. but a lot also depends on the pads!! and how they grip as well as how you initially break in the pads/rotors. if they get glazed it wont matter what size you have it won't stop well.

+1 for Tobin @Kore3.

He should know the ssbc caliper specs and pressure the 7/8 master will produce.

I'm running 7/8" with a stock power disc brake pedal and pedal effort may be a bit much for some. Ideally a little more leverage would be nice, but not enough to motivate me to pull the pedal out and alter it. :D

You're right -- I reversed that when typing