replacing rear disc brakes

Are you trying to take the entire wheel bearing assembly off?

no only trying to remove disc pads to put new ones in , had to undo two rear bolts to take off complete assembly to change front ones but rear has four bolts which i have removed but still unable to remove pads

By "four bolts" do you mean two on each side or four on one wheel? The caliper is held on with just two small bolts inside rubber sleeves. Chrysler used to use 10 mm hex head bolts but I think they're using torx heads now, typically a T45 or possibly a T50.