2004 Ford Expedition Owner Guide 3rd Printing (Spanish) - Page 717

Maintenance and Specifications When the tread is worn down to 1/16th of an inch (2 mm), tires must be replaced to prevent your vehicle from skidding and hydroplaning. Built-in treadwear indicators, or "wear bars", which look like narrow strips of smooth rubber across the tread will appear on the tire when the tread is worn down to 1/16th of an inch (2 mm). When you see these "wear bars", the tire is worn out and should be replaced. Inspect your tires frequently for any of the following conditions and replace them if one or more of the following conditions exist: • Fabric showing through the tire rubber • Bulges in the tread or sidewalls • Cracks or cuts on the sidewalls • Cracks in the tread groove • Impact damage resulting from use • Separation in the tread • Separation in the sidewall • Severe abrasion on the sidewall If your vehicle has a leak in the exhaust system, a road tire or the spare tire may be exposed to hot exhaust temperatures requiring the tire to be replaced. Safety practices Driving habits have a great deal to do with your tire mileage and safety. • Observe posted speed limits • Avoid fast starts, stops and turns • Avoid potholes and objects on the road • Do not run over curbs or hit the tire against a curb when parking If your vehicle is stuck in snow, mud, sand, etc., do not rapidly spin the tires; spinning the tires can tear the tire and cause an explosion. A tire can explode in as little as three to five seconds. Tire explosions can cause death, personal injury or property damage. Do not allow anyone to stand near, directly ahead or behind the spinning tire. 333