1998 Buick Century Owner's Manual - Page 287

There are only two reasons why the brake fluid levelin the reservoir mightgo down. The first is that the brake fluid goes down to an acceptable level during normal brake lining wear. When new liningsare put in, the fluid level goes back up. The other reason is that fluid islealung out of the brake system.If it is, you should have your brake system fixed, sincea leak means that sooneror later your brakes won't work well,or won't work at all. So, it isn't a good idea to "topoff' your brake fluid. Adding brake fluid won't correct a leak. If you add fluid when your linings are worn, then you'll have too much fluid when you get new brake linings.You should add (or remove) brake fluid, as necessary, only when work is done on the brake hydraulic system. When your brake fluid falls to low level, yourbrake a warning light will come on. See"Brake System Warning Light" in the Index. 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. @ Always clean the brake fluid reservoir cap and the area around the cap beforeremoving it. Thiswill help keep dirt from entering the reservoir. 'A I CAUTION: I I If you have too much brake fluid, can spill on it the engine. The fluid burn if the engine is will hot enough.You or others could be burned, and your vehicle could be damaged. Add brake fluid only when work is done on the brake hydraulic system. With the wrong kind fluid inyour brake of system, your brakes may not work or they well, a may not even work at all. This could cause crash. Always use the proper brake fluid. 6-27