Some common problems with anti-lock brakes include faulty brake sensors and leaks in the brake master cylinder due to corrosion. The problems tend to develop gradually and in many cases are manufacturer-specific, says YouFixCars.com.
Contamination of the anti-lock brake system sensors by debris damages the sensors’ wiring, leading the system to work intermittently. A damaged brake system provides false feedback to the car’s brake system controller, causing the anti-lock system to activate when it should not or to deactivate when it should. Corrosion of the brake’s master cylinder causes its piston seals to leak. Such leakage reduces the reserve pressure and causes the pump to overwork. Ultimately, the pump burns out and fails after running continuously.