I recently discovered my rear brakes are not functioning. I was removing the lug nuts from the rear wheel while on jack stands. I had a friend holding the brakes down for me. The wheel still spun freely. He had to stand on the brakes with all his weight to keep the wheel from spinning while I was removing the lug nuts. Looking at the rotor, there is a nice film of dust with only a few smudges on it. The e-brake is depressing and unlocking normally, but provides no actual braking when pressed. I have not had done any work on the brakes since I purchased the car several years ago (none appeared to be needed). Any suggestions on the possible cause and fixes would be greatly appreciated. I would hate to go and replace the calipers if the issue is somewhere else.
Thanks,
J.