could be something as simple as dirty front ABS sensors.The light means the ABS system is not functioning. The vehicle is still ok to drive, but the Anti-Lock Brake System will not be functional. Chances are you damaged a wheel speed sensor. When the ABS reads different speeds at different wheels, it will turn on the light an disable the ABS system.
The ABS system works basically by monitoring the speed of each wheel during braking. if a wheel begins to turn slower the the rest, that wheel is locking up, and the ABS system will release some pressure from the brakes ok that wheel. When a sensor is damaged, it will constantly give a different speed reading at that wheel, and will disable the system to avoid complications if it were to try to operate.
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