Depends on which setup you want to go, tarmac, gravel. Gravel for example used to have 16" wheels with 315mm discs and 4 pots calipers. All serious rallycars does have an hydraulic handbrake and for 4wd the best (and unfortunetly very expensive) would be a clutch release for the handbrake, but well be ready to spend fortune there, and it is only the rear of the car mate.