1997 GMC Suburban Owner's Manual - Page 210

After Off-Road Driving Remove any brush or debristhat has collected on the underbody, chassis orunder the hood. These accumulations can be a firehazard. After operation in mud or sand, have the brake linings cleaned and checked. These substances can cause glazing and uneven braking. Check the body structure, steering, suspension, wheels, tires and exhaust system for damage. Also, check the fuel lines and cooling system for any leakage. Your vehicle will require more frequent servicedue to off-road use. Refer to the Maintenance Schedule for additional information. Driving at Night Night driving is more dangerous than day driving. One reason is that some drivers are likely to be impaired -- by alcohol or drugs, with night vision problems, or by fatigue. 4-28