1998 GMC Sonoma Owner's Manual - Page 282

What to Add When you do need brake fluid, use only DOT-3 brake fluid -- such as Delco Supreme 11 (GM Part No. 12377967). Use new brake fluid from a sealed container only. @ I NOTICE: 0 Always clean the brake fluid reservoir cap and the area around the capbefore removing it. This will help keep dirt from entering the reservoir. I 0 With the wrong kind fluid in yourbrake of system, your brakes may not work or they well, may noteven work a t all. This could cause a crash. Always use the proper brake fluid. Using the wrong fluid can badly damage brake system parts. For example, justfew a drops of mineral-based oil, such as engine oil, in your brake system can damage brake system partsso badly thatthey'll have to be replaced. Don't let someone putin the wrong kindof fluid. If you spill brake fluid on your vehicle's painted surfaces, the paint finish can be damaged. Be careful not to spill brake fluid on yourvehicle. If you do, wash it off immediately. See "Appearance Care" in the Index. 6-32