system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do cars allow you to drive with the e-brake on? Isn't that just faulty design?
gpt
The E-brake is intentionally designed to be separate from the primary braking system. If there is a fault in the primary brakes (pedal damaged, etc), it would affect the E-brake if they were connected. 

That being said, the proper response is to shift to neutral (preventing the car from further accelerating and allowing friction to slow the car's existing motion) prior to or while using the E-brake.