Correct Wilwood Master Cylinder and Booster

[novajess1972]

Ordered Wilwood front and rear setup for my Chevelle.
FNSL6R Big Brake front p/n 140-12771 (6 piston)
Dynapro Low Profile Rear p/n 140-11398 (4 piston)

Now which master cylinder and booster is most compatible with this setup? I am currently running The Right Stuff booster/master and combo valve setup with my CPP C5 brake/spindle and SSBC rear brake combo. Is it even necessary to upgrade? May be a no-brainer, but I have to ask. This is my first time running a somewhat high-end setup, so forgive my "green-ness". Just didn't want to spend unnecessary $$$ on something that's more aesthetically appealing than functional as compared to my current booster and m/c setup.

Any advice appreciated.

[Apogee]

Can you be more specific as to your current booster size (diameter) and configuration (single or dual-diaphragm), as well as the bore size of your master cylinder? While it's possible that what you have will work just fine, it's impossible to ascertain that without knowing what exactly it is that you have. That said, you could always run it since it's what you've got and find out for yourself...it'll either work well, be overboosted and touchy or underboosted and unresponsive, but regardless it should stop the vehicle so long as you test it out in a safe manner.

FWIW, the FNSL caliper has essentially the same piston area as a C5/C6 caliper, 4.04" versus ~4 square inches as well as a comparable rotor diameter, 12.88" versus 12.79", so the hydraulic requirements will basically be the same up front. As for the rear, the DP 4-piston caliper has 1.98 square inches piston area (versus 2.46" for a C5) and an 11" diameter rotor (versus 12" for C5/C6), so you're potentially a bit under-braked in the rear, but not severely. For a vacuum assist application like the Wilwood kits noted, a 15/16" or 1" bore MC paired with a decent single-11", dual-8" or dual-9" booster should work pretty well so long as your engine provides enough vacuum.

Tobin
KORE3