Replaced Master cylinder and brake booster and the ABS light went on?

Here are a couple guides that will help with this:

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

https://www.2carpros.com/articles/how-to-replace-an-abs-wheel-speed-sensor

Plus a video that will help as well.

https://www.youtube.com/watch?v=ANWVTh2RQoQ

Lastly below is the process from the manual on how to replace these. Please let us know if you have questions. Thanks