We just had a weird one, 1998 Lexus Gs 300 80K miles, after rotation tires, Michelin Harmony radials, the Lexus experienced servere brake pulsations upon application at 60+ mph, would brake fine 50 mph and below. Using the 5 tire rotation pattern I determined that the only right front tire was changed, being the left front came front the right front. I placed the spare on the right front and almost eliminated the pulsations. Returned tire and car to tire dealer who stated he had never heard of such a problem caused by tires, we placed the defective tire on the right front and the dealer drove the car and agreed it appeared to be a tire problem. The tire dealer did a fine re balance of all the tires, they had all changed by small amounts he stated, and with the apparent defect tire again on the right front the problem was totally eliminated. I never would had though slight tire balance could affect brake performance.
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