I need to buy my 3rd set of brake rotors for my 80K 04 F250. The first stock set went at 25K. The second elcheapo advance auto set started to go after 40K. What kind of rotors have you guys had luck with on 6k plus trucks. Where are the best deals on line?
Any grey iron rotor is going to rust when left to sit, but it should just be surface rust and should be removed from the pad swept area after a few applications of the brake when driving.
A lot of manufacturers have optional coatings. In my opinion E-coat is the most effective. Gold zinc and clear zinc will help somewhat but can discolor or burn off if you get them really hot. None of these coatings should be on the rotor swept surface.
are you sure the rotors are warped or are they gripping unevenly due to off-gassing? .... The pad material is not evenly dispersed on the rotor causing it to grip better in one spot. you may just need to rebed your existing rotors.
the uneven deposits are caused by stopping heavily and then holding the vehicle completely still with the brakes, causing hot pad material to be deposited in the one place were the pad is holding.
some manufacturers recommend a pad bed-in practice that suggests heating the pads and rotors up without completely stopping......
NAPA is tricky. Watch out for their "clever" marketing. The Premium rotors are not their good rotors. Their "good" line is the Ultra Premium rotors.... I paid extra for premium NAPA rotors on my car last time, and they're still crap. They rust quickly, and the pads don't clean them up...