Brakes?!?

[Boombastic]

Well I have hunted around the net for a little bit trying to see if there is some kind of big brake kit for my 88 turbo. I have come up short because it seems everyone who makes a kit for supra is years 93-98 which doesn't help me out, and to boot there supra expensive like close to 2500.00 for all 4 wheels. I have since figured out a way using a toyota 4runner 4-piston caliper and a roush mustang 13" rotor cross-drilled and slotted because mustangs and supras have the same bolt pattern. In the rear I am going to put the stock 10" rotors on from the front for more surface area and am trying to locate a 2-piston caliper for that set-up. I was wondering though if I need to upgrade my master cylinder and brake booster to keep up with adiquate pressures to feed the beefier calipers all around? And if so is there a place where I can buy such a thing, or could I just go out and get a brake booster with matching master cylinder off an old truck to keep up with the needed pressures?