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1. All four wheels must be balanced, preferably spin balanced.
2. Before you spend the money to have someone else pull your wheels, turn your rotors and reinstall the wheels. You should know that no matter what the guy at the front desk tells you, the wrench they use to tighten your lug nuts will either not be calibrated or the guy cranking on it won't care and the lug nuts will not be torqued evenly.
The AW11 brake rotors are sensitive to torque variations and the rotors will warp from uneven torque causing the vibration you felt during braking.
Invest in a good quality torque wrench and check all lugs on all wheels. Correct torque for an 89 is 76 ft lbs. In fifteen years of owning this car I haven't found a tire shop yet that has gotten it right on all sixteen lug nuts. I now have 148k on the car with the original rotors and haven't had to turn them yet.
By the way, that torque wrench will pay for itself countless times if properly taken care of. Don't waste your money on a $15.00 1/2" drive clicker from Harbor Freight, I think Kazin1111 broke a head bolt using a borrowed one. His money out of pocket (on his second engine since the original that the head bolt broke on) has to be somewhere over 2k. If I remember correctly.
Don't get me wrong, I own some Harbor Freight tools, but my point is don't scrimp on tools that have to be calibrated and so much is riding on. I torque everything I can and Never-Seeze all fasteners. While it's nasty stuff that can get everywhere it will be your life long friend if you ever have to take something apart again. If you took it apart once, you will see it again, it might be ten years but you will see it again.
Sorry this got long, good luck.
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