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Old 06-12-2018, 10:58 AM   #2 (permalink)
gomer_110
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Join Date: Aug 2011
Location: Perrysburg, OH
Posts: 17,992
Drives: '11 Nismo #528 GM
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A few things:

1. Rotors rarely actually warp. The phenomena that generally is to blame is brake pad deposits on the rotor face. Doing some hard braking from ~55 to 5 mph 5 or 6 times in a row and then allowing the brakes to cool without having the brakes applied at all may help.

2. Vibration at or above a certain speed with everything else being the same often indicates a wheel (or wheels) that are out of balance.

3. I like the Z1 2-piece rotors on my car but for a non-competition or HPDE car they are probably just a waste of money.
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