Wa Alaikum Salam. Disc Brakes VS Drum Brakes, and ABS VS Non-ABS are separate things.
IMO, you may have the brakes and allied systems checked from some good garage / expert Mechanic. If something is reqd. To be flushed, changed / replaced, then have it done, else if, no need to mess up anything, just out of speculations or curiosity.
I hope it helps. Thank you.