As mentioned above, there’s a possibility this issue could be due to low brake fluid levels, however, your ABS isn’t as crucial as your primary braking method, which should still be functional if this is your only warning.
The ABS is simply an ‘assist’ feature to your brake system, so it isn’t a red-warning issue. That being said, this could be a sign that your brake system is deteriorating, so the longer you wait, the more you put your safety at risk.
Warning Level: Yellow