Tonight my cousin parked his 95 cobra in my driveway which is a step hill. About 2 hours later he went to start it and as he sat down it started rolling backwards. He was also able to pull the e-brake handle up allot higher than normal. It never did stop the car, he had to actually press the brake pedal. This is the first time it happened, normally the handle will not go up past half way. Any ideas on what could cause it to just start doing that?