1998 Mercury Villager Owner Guide 1st Printing - Page 220

During ABS activation, a mechanical noise may be heard as the ABS cycles. This is normal ABS operation. Anti-lock brake system (ABS) On vehicles equipped with an anti-lock braking system (ABS), a noise from the hydraulic pump motor and pulsation in the pedal may be observed during ABS braking events. Pedal pulsation coupled with noise while braking under panic conditions or on loose gravel, bumps, wet or snowy roads is normal and indicates proper functioning of the vehicle's anti-lock brake system. If the vehicle has continuous vibration or shudder while braking, felt mainly in the steering wheel, the vehicle most likely needs service. The ABS system has self-check capabilities. The system turns on the ABS warning light each time you start the engine. After the engine is started and the ABS warning light turns off, the system performs another test the first time the vehicle reaches 4 mph (6 km/h). A mechanical noise may be heard as the ABS system performs a self test. This is a normal part of the self test feature. If a malfunction is found during this check, the ABS warning light will come on. You should always be careful when braking, even if your vehicle has the ABS system. Heavy braking on roads with loose surfaces such as snow or gravel, or roads with severe pavement irregularities could also cause you to lose control of your vehicle. WARNING If the anti-lock brake system warning light remains on or comes on while driving, have the braking system checked by a qualified service technician as soon as possible. 216