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WHEEL ALIGNMENT 2B-5 VIBRATION DIAGNOSIS Wheel imbalance causes most highway speed vibration l A tire is out of round. l A rim is out of round. l A tire stiffness variation exists. Measuring tire and wheel free runout will uncover only Preliminary Checks Prior to performing any work, always road test the car l Obvious tire and wheel runout. l Obvious drive axle runout. l Improper tire inflation. l Incorrect trim height. l Bent or damaged wheels. l Debris build-up on the tire or the wheel. l Irregular or excessive tire wear. l Improper tire bead seating on the rim, l Imperfections in the tires, including: tread Tire Balancing Balance is the easiest procedure to perform and should be done first if the vibration occurs at high speeds. Do An on-vehicle finish balance will correct any brake drum, |