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1989 964 Strong Vibration in Steering wheel under heavy braking

Brakes

Vehicle Information: Year: 1989; Body Type: Coupe; Engine (type, size, modifications): 3.6; Total Mileage: 117000;

One the last day (3 day DE) at every corner under heavy braking at the Texas Motorsport Speedway DE this past weekend, there was strong vibration felt through the steering wheel. I have plenty of pad and before I have the dealer look at the rotors, the likely suspicion is a warped rotor? No, I don't put the parking brake on after any session. The calipers and rotors up front have 10K miles on them and I don't know the mileage on the rear rotors but had them turned last Aug. Any thoughts and any other areas I should look into?

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