A quick look at Tesla's braking system, how it differs from older cars, and how Autopilot can activate it.
Bosch iBooster: https://www.bosch-mobility-solutions.com/en/solutions/driving-safety/ibooster/
How Hydraulic Brakes work: https://en.wikipedia.org/wiki/Hydraulic_brake
Brushless Motors: https://en.wikipedia.org/wiki/Brushless_DC_electric_motor
For those that keep asking: The brushless motor used in the iBooster is NOT sensorless! There is a TDK hall-effect angle sensor in the middle of the PCB that senses motor position and generates the feedback.
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