jmack,
Are you the first owner of this PT? Have the brakes been replaced before? How many miles are on the car? The lack of shims can cause the the brakes to have a pulsating feel (per the warning on the installation sheet that came with my Raybestos pads).
Were your brakes pulsating before you changed them? If not, then I have to believe that the lack of the shim is causing your problem or perhaps the bent shim rubbing on the rotor warped the rotor, particularly if the rubbing was intermittent.
If you replace the rotors, shop around the local auto parts stores for the best price. Try to stay away from the Chinese rotors (usually the el cheapo rotors) as the quality is nowhere near as good as a US (rare) or Canadian-manufactured rotor.
BTW, if this is the car's first rotor replacement, make sure you remove the star washer on each rotor (one per rotor, on one of the wheel studs) with cutting pliers. Otherwise, you can't get the rotor off the car. The reason the star washer was there is to keep the rotor in place on the car while the car moves down the assembly line prior to installation of the calipers. You do not need to reinstall the star washer after the new rotor is installed. However, use one of your lug nuts to snug the rotor against the hub prior to re-installing the caliper. This will make your life so much easier when you re-install the caliper. Also, make sure the pad springs (the "TV-antenna" prongs on the top of the pads) are not sticking out of the inspection slot of the caliper once everything is in place.
Scott
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