1998 GMC Sonoma Owner's Manual - Page 284

Brake Adjustment Every time you make a brake stop, your disc brakes adjust for wear. If you don't have four-wheel drive and your brake pedal goes down farther than normal, your rear drum brakes may need adjustment. Adjust them by backing up and firmly applying the brakes a few times. Battery Every new vehicle has an ACDelco Freedom@battery. You never have to add water to one of these. When it's time for a new battery, we recommend an ACDelco Freedom battery. Get one that has the replacement number shown on the original battery's label. Vehicle Storage If you're not going to drive your vehicle for 25 days or more, remove the black, negative (-) cable from the battery. This will help keep your battery from running down. Replacing BrakeSystem Parts The braking system on a modern vehicle is complex. Its many parts have to be of top quality and work well together if the vehicle is to have really good braking. Your vehicle was designed and tested with top-quality GM brake parts. When you replace parts of your braking system -- for example, when your brake linings wear down and you have to have new ones put in -- be sure you get new approved GM replacement parts. If you don't, your brakes may no longer work properly. For example, if someone puts in brake linings that are wrong for your vehicle, the balance between your front and rear brakes can change -- for the worse. The braking performance you've come to expect can change in many other ways if someone puts in the wrong replacement brake parts. Batteries have acid that can burn you and gas if that can explode.You can be badly hurt you "Jump Starting" in the Index aren't careful. See for tips on working around a battery without getting hurt. Contact your dealer to learn how to prepare your vehicle for longer storage periods. 6-34