system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: Why is that when an elevator is about to go up, it first sinks a little bit?
gpt
This should be the brakes releasing on cable elevators.

At a stop the elevator engages basically a parking brake on the motor to keep it still without using power. The sinking is due to a the motor needing a slight bit of time to adjust it's pull when the brake is released.