1997 GMC Jimmy Owner's Manual - Page 288

Refer to the Maintenance Schedule to determine when to There areonly two reasonswhy the brake fluid level in check your brake fluid. See "Periodic Maintenance the reservoirmight go down. The first is that the brake Inspections" in the Index. fluid goes down to acceptable level during normal an brake lining wear. When new linings are put in, the fluid Checking Brake Fluid level goes back The other reason is that fluid is up. leaking outof the brake system.If it is, you should have your brake system fixed, since a leak means that sooner or later your brakes won't work well, orwon'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.you add fluid If when your liningsare worn, then you'll have too much fluid when you get new brake linings. You should add (or remove) brake fluid, as necessary, when work is only done on the brake hydraulic system. I If you have too much brake fluid, itcan spill on the engine. The fluidwiu burn if the engine is hot enough. You or others couldbe burned, and your vehicle could be damaged. Add brake fluid only when work is done on the brake hydraulic system. You can check the brake fluid without taking the cap. off Just look at the windows on the brake fluid reservoir. be The fluid levels should above MIN.If they aren't, have your brake system checked to seethere is a leak. if After work is done on the brake hydraulic system, make sure the levels are above and below the topof MIN each window. 6-29