Your wheels may lock under hard braking in a vehicle without ABS (anti-lock braking system) . If you have to brake hard in a vehicle without ABS , Brake firmly but carefully . Be prepared to quickly reduce the pressure before the wheels lock and begin Skidding . If you fail to relieve pressure and the wheels lock, it will take longer to stop . [ ABS - Anti-lock Braking System , Braking and Stopping , Part E - Other Road Users , ACT Road Rules Manual ]