Hi,i am currently using 4 holes rims and DC2 rear brakes.JPJ failed my rear brakes,so i am wondering how can i upgrade my rear brakes?What brake rotors and calipers i have to choose from?I am using 4 hole rims and brakes and choices seem limited for 4 hole.Please advise....I also have type R brake pump and steel braided hoses.Front brakes were upgraded already so i am just concern with the rear ones.Thanks!