When ABS was first implemented, how did the braking system sense that the wheel had locked?

Posted by CharlesElwoodYeager@reddit | askcarguys | View on Reddit | 43 comments

I'm looking at this from the perspective of an avionics control engineer. We have lots of onboard sensors, and we can calibrate control loop responses to them with a variety of effectors. In the 80s, what kind of information could you reliably get from a wheel?