Brake Rotors
Rotors will eventually start to show signs of wear; how fast depends on the type of racing, the frequency, and the brake usage. Grooving and/or cracking due to severe heat and thermal cycling indicate the rotor should be replaced. Note that surface checking itself is not a sign a rotor needs replacing as this can occur on iron rotors. Always replace rotor mounting bolts and lockwire whenever replacing rotors, taking care to inspect mounting hats or hubs for signs of abuse.
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Apparently, owning cool car parts might give you cancer—if you live in California, and you decide to eat them. This product contains stuff the State of California says could cause cancer, birth defects, or “other reproductive harm.” So maybe don’t chew on it. For the full horror story, visit www.P65Warnings.ca.gov