1998 Buick Century Owner's Manual - Page 288

NOTICE: Using the wrong fluid can badly damage brake system parts. For example, just few a drops of mineral-based oil, such as engine oil, in your brake system can damage brake system parts so badly thatthey'll have to be replaced. Don't let someone put in the wrong kindof fluid. If you spill brake fluid on yourvehicle's painted surfaces, the paint finish can be damaged. Be careful not to spill brake fluid on yourvehicle. If you do, wash itoff immediately. See "Appearance Care" in the Index. Brake Wear Your vehicle has front discbrakes and rear drum brakes. Disc brake pads have built-in wear indicators that make a high-pitched warning sound when the brake pads are worn and newpads are needed. The sound may come and go orbe heard all the timeyour vehicle is moving (except when you are pushing on the brake pedal firmly). The brake wear warning sound means that soon your brakes won't work well. That could lead to an accident. Whenyou hear the brake wear warning sound, have your vehicle serviced. I NOTICE: Continuing to drive with worn-out brake pads could result in costly brake repair. 6-28