my parking brakes hardly works. if i park on a pretty slant hill w/ just the parking brakes on, my car would roll. i'm not sure where to adjust this since they are rotors instead of drums. i'd already tried right under where the pulling lever are but it didn't make much difference. i think i remember improving the braking after changing the pads but not much. i also know/think that the right side cable have bond w/ the assembly by corrosion that's why the left side brakes just a little bit better. can anyone help me on this?