jt1 Posted October 7, 2002 Share Posted October 7, 2002 Took the Z to a HPDE this weekend. I had just installed new pads all the way around, Performance Friction 01's up front, 97's on the rear. I had the rotors turned lightly just to clean them up before installing the new pads. My car has the Arizona Z Wilwood conversion. Saturday everything was great. Good brakes, no fade, no problem. The first run Sunday was fine, but on the second run, the brakes were great cold, but as they warmed up the front rotors acted like they were warped. The steering wheel vibrated pretty badly when the brakes were applied, enough that I considered stopping. I assumed I had warped a rotor- BUT as the brakes came up to full temp, the vibration became barely noticable. Slight vibration, but not much. Visual inspection after the run revealed everything looking OK, but there was a "blue line" about 1/4 - 3/8" in toward the hat from the wear mark the pad leaves on the rotors. I have never seen this before. The same pattern repeated itself on the third and forth runs. Will turning the rotors be OK or do I need new ones? Are the new pads putting more heat into the rotors than they can dissipate? What do I need to do to prevent this in the future? Different compound pads? Why does the vibration come in and go away as the rotors heat up? Thanks for the help, this has me puzzled. John Quote Link to comment Share on other sites More sharing options...
Guest greimann Posted October 8, 2002 Share Posted October 8, 2002 Here is a link to an article that Grumpyvette posted a while ago that should help. http://www.stoptech.com/whitepapers/warped_rotors_myth.htm Quote Link to comment Share on other sites More sharing options...
Z-Gad Posted October 8, 2002 Share Posted October 8, 2002 Excellent link. I also understand that brake rotor warpage can be caused by over-torque-ing the lugnuts. Another good reason to invest in a good torque wrench Quote Link to comment Share on other sites More sharing options...
jt1 Posted October 8, 2002 Author Share Posted October 8, 2002 What a great link. I learned a ton there. Thanks Greimann, Grumpy, and HybridZ. Zgad, when I had a Z with stock rotors, I let a tire shop hammer a set of wheels on with air wrenches and it definetly warped the rotors. Since then I've always used a torque wrench. John Quote Link to comment Share on other sites More sharing options...
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