Are the tyres the same size?
Is there any discrepency in the waveform compared to the other side when you spin the wheel... including the amplitude when the wheel is slowing down?
The best idea is
Get 2 channels deployed on the scope and sit the car in the brake rollers (if you have any) for easy comparison.
Any cracks in the pick up should be clearly seen in the waveform... have a closer look and look out for a reoccuring glitch in the waveform
hth
James
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