1993 Buick LeSabre Owner's Manual - Page 250

Brake Master Cylinder Your brake master cylinder is here. It is filled with DOT-3 brake fluid. won't work at all. So, it isn't a good idea to "top off' 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. A CAUTION: If you have too much brake fluid, it can spill on the engine. The fluid will burn if the engine is hat ,..ough. You or others could be burned, and you1 vehicle could be damaged.Add brake fluid only when work i done onthe brake hydraulic s system. There areonly two reasons why the brake fluid level in your master cylinder might go down. The first is that the brake fluid goes down to an acceptable level during normal brake lining wear. When new linings are put in, the fluid level goes back up. The other reason is that fluid is leaking out of the brake system. If it is, you should haveyour brake system fixed, since aleak means that sooner or later your brakes won't work well, or When your brake fluid falls to a low level, your brake warning light will come on. See "Brake System Warning Light" in the Index. When your brake fluid falls to alow level, your brake warning light will come on and a chimewill sound. 248