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I finally got my 993 to the shop to be looked at. The mechanic looked and tested every busing/bearing and could not find a culprit. He went for a 30 min test drive over hills etc. Got back and measured the temperature of the rotor and found the rotor varied by over 100 degrees in places. He was pretty sure that the pulsation was constant and to replace the rotors. The rotors are original and have 90K + miles.
That's my next move....looking at options now for rotors and pads so any suggestions welcomed. Will also do a fluid flush with dot 4. thanks
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