system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it called an emergency brake if most people only use it for parking?
gpt
In the UK it's called a handbrake.  Although in some cars it isn't hand operated. With an auto transmission most have a transmission lock when in park so the car is unlikely to move. The foot operate brake pedal is usually hydraulic. The parking or "emergency" brake is cable operated. If the hydraulic brake servo fails, i.e because the engine has stalled, you can use the hand operated brake to stop the vehicle.