An emergency brake ("E-brake") or parking brake is a vehicle device that provides a driver with a means of stopping the vehicle should the main brake system fail, or to prevent the vehicle from rolling while parked and unattended.
The emergency brake can be used for a handbrake turn, a controlled slide that allows a fast vehicle to perform a tight turn at higher speed and with full throttle, or to quickly spin a vehicle in a confined space. The maneuver typically requires an engine capable of producing high torque, on a vehicle with sufficient power-to-weight ratio.
In Battlefield Hardline, E-brakes are standard on almost all ground vehicles, with the notable exception of the Fuel Tanker. Vehicles may also perform maneuvers such as "donuts", though utility in combat is questionable.