Not sure exactly, I believe you need all the components including something with the e brake. Youre better off keeping the rears stock. Get oem calipers for our p5's get some good blank rotors, good pads and decent brake fluid. As for the fronts, you can do a straight drop in swap of Mazda 6 brakes. This only works for the front and you cannot use mazdaspeed 6 brakes as they are too big.