ABS warning light turns on

Hello,

Have you bled the system after adding fluid?
Keep in mind that this ABS system will require a scan tool to bleed properly.

https://youtu.be/nQRnKyVyMuQ

The ABS light can be on due to a number of reasons. Could be for a sensor, wiring issue, master cylinder, module etc.
Best course of action would be to scan and retrieve the ABS code(s), this can help with the diagnostics.

Here is a helpful guide

https://www.2carpros.com/articles/abs-warning-light-on-easy-repair-guide

Please let me what codes you are able to retrieve or if you have any questions.
Thank you.