What it can mean
Normal hydraulic braking may remain, but anti-lock assistance and related stability functions can be unavailable.
What to do next
- Drive cautiously if normal braking feels unchanged.
- Avoid conditions that demand maximum braking until inspected.
- Treat a simultaneous red brake warning as more urgent.
Possible causes to test
- Wheel-speed sensor or wiring
- Tone ring damage
- Low system voltage
- ABS module or hydraulic fault