1997 Chevrolet Blazer Owner's Manual - Page 284

There are only two reasonswhy the brake fluid level in the reservoir 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 isthat fluid is leaking out of the brake system. If it is, you should have your brake system fixed, since aleak means that sooner or later your brakes won't work well, or won't work at all. Refer to the Maintenance Schedule to determine when to check your brake fluid. See"Periodic Maintenance Inspections" in the Index. Checking Brake Fluid I 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. IA & - CAUTION: You can check the brake fluid without taking off the cap. Just look at the windows on the brake fluid reservoir. The fluid levels shouldbe above MIN. If they aren't, have your brake system checked to see if there is a leak. After work is done on the brake hydraulic system,make sure the levels are above MIN and below the top of each window. If you have too much brake fluid, it can spill on the engine. The fluid will burn if the engineis 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. 6-29