Last Night I tried to reverse my car out of the garage and rear tires were not moving. The parking brake was all the way down, I made sure that I was in the reverse gear, I floored it and my friend said the rear tires were dragging. I eventually got the car to reverse properly by putting the parking brake on and off really quick. This has never happened in the 4 years with my car. Is this something that I should get checked out or is it common?