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i really only run my PFC's on new to slightly used rotors.
They will eat up your rotors.. The shuddering is probably due to warping, heat or un-even pads being used on different rotors they were matched to originally.
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www.nybmwcca.org
Current Cars:
1995 M3 Coupe Manual Alpine White
1997 M3 Sedan Auto Cosmo Black Metallic
2018 x3 m40 Auto Grey Metallic
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