1999 Lexus LS 400 Owners Manual - Page 438

CHASSIS The recommended cold tire pressures, tire size and the vehicle capacity weight are given on the label inside the glove box lid. You should check the tire pressures every two weeks, or at least once a month. And don't forget the spare! The pressure for the spare tire should be 220 kPa (2.2 kgf/cm2 or bar, 32 psi). Incorrect tire pressure can reduce tire life and make your vehicle less safe to drive. Low tire pressure results in excessive wear, poor handling, reduced fuel economy, and the possibility of blowouts from overheated tires. Also, low tire pressure can cause poor sealing of the tire bead. If the tire pressure is excessively low, there is the possibility of wheel deformation and/or tire separation. So keep your tire pressures at the proper level. If a tire needs frequent refilling, have it checked by your Lexus dealer. High tire pressure produces a harsh ride, handling problems, excessive wear at the center of the tire tread, and a greater possibility of tire damage from road hazards. The following instructions for checking tire pressure should be observed: D The pressure should be checked only when the tires are cold. If your vehicle has been parked for at least 3 hours and has not been driven for more than 1.5 km or 1 mile since, you will get an accurate cold tire pressure reading. D Always use a tire pressure gauge. The appearance of the tire can be misleading. Besides, tire pressures that are even just a few pounds off can degrade handling and ride. D Do not bleed or reduce tire pressure after driving. It is normal for the tire pressure to be higher after driving. D Never exceed the vehicle capacity weight. The passengers and luggage weight should be located so that the vehicle is balanced. D Be sure to reinstall the tire valve caps. Without the valve caps, dirt or moisture could get into the valve core and cause air leakage. If the caps have been lost, have new ones put on as soon as possible. 422