the rear brakes are on a proportionong valve depending on the car the front will use 70-85 percent of the power and the rear 30-15 percent also the rear pads should have 4-6 millimeters when new baking up to ajust the rear is correct but you would have to back up to china for this to acctually work properly it only takes a couple of minutes to take off the tires and ajust and clean them just a star nut you can usually adjust by hand