So, last night I pulled into a friends driveway that has a slight incline, pulled up the brake, turned off the car, let my foot off the brake and started rolling back. After doing this a couple times I put the car in gear and pulled up the e-brake as far as I could and it finally stayed in place. Does anyone know why this would have happened? The last 3 cars I've owned have been manuals and I have never had anything like this happen before.