1996 GMC Sonoma Owner's Manual - Page 255

NOTICE: 0 Brake Wear Your vehicle has front disc brakes 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 new pads are needed. The sound maycome and go or be heard all the time your vehicle is moving (except when you are pushing on the brake pedal firmly). 0 Using the wrong fluid can badly damage a few brake system parts. For example, just 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 kind of 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 your vehicle. If you do, wash itoff immediately. See "Appearance Care'' in the Index. The brakewear warning soundmeans that sooner or later your brakes won't work well. That could lead to an accident. When you hear the brakewear vehicle serviced. warning sound, have your I NOTICE: Continuing to drive with worn-out brake pads could result in costly brake repair. 6-33