Friction is the resistance of movement between two surfaces in contact. Friction occurs between your tires and the road, in your brakes when applied, and in many parts of your car. If it weren't for friction, you couldn't start, move, turn, or even stop your car in an emergency. You'd have to wait for it to stop itself. The weight of a vehicle produces more friction between the tires and the road surface.
For effective friction, the brakes and other parts of your car, including your engine and transmission, should be properly lubricated. Otherwise you may experience mechanical failure.