1997 Nissan Sentra Owner's Manual - Page 102

and releases hydraulic pressure (like pumping the brakes very quickly). While the actuator is working, you may feel a pulsation in the brake pedal and hear a noise or vibration from the actuator under the hood. This is normal and indicates that the anti-lock system is working properly. However, the pulsation may indicate that road conditions are hazardous and extra care is required while driving. while driving, take your vehicle to your NISSAN dealer for repair at your earliest convenience. WARNING ● The anti-lock brake system is a sophisticated device, but it cannot prevent accidents resulting from careless or dangerous driving techniques. It can help maintain vehicle control during braking on slippery surfaces, but remember that the stopping distance on slippery surfaces will be longer than on normal surfaces, even with the anti-lock system. Stopping distances may also be longer on rough, gravel or snow covered roads, or if you are using tire chains. Always maintain a safe distance from the vehicle in front of you. Ultimately, the responsibility for safety of self and others rests in the hands of the driver. ● Tire type and condition may also affect braking effectiveness. ● When replacing tires, install the specified size of tires on all 4 wheels. ● When installing a spare tire, make sure it is the proper size and type as specified on the tire placard. For tire placard location information, refer to ''Tire placard'' in the Owner's Manual index. ● Refer to ''Wheels and tires'' in the ''Do-it-yourself operations'' section of this manual. Self-test feature The anti-lock brake system is sophisticated, with electronic sensors, electric pumps, and hydraulic solenoids controlled by a computer. The computer has a built-in diagnostic feature that tests the system each time you start the engine and move the vehicle at a low speed in forward or reverse. When the self-test occurs, you may hear a ''clunk'' noise and/or feel a pulsation in the brake pedal. This is normal and is not an indication of any malfunction. If the computer senses any malfunction, it switches the antilock brake system OFF and turns on the ABS brake warning light in the dashboard. The brake system then operates normally, but without anti-lock assistance. If the light comes on during the self check or 4-18