I'm thinking about purchasing the slotted and drilled brake rotors with pads for a 93 F-150 4 WD. Are these worth the extra expense? What are the best upgraded pads?
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Don't get the drilled brake rotors. Slotted rotors are all you need. There is a very good chance to crack a drilled rotor compare to a slotted rotor, plus the performance between a drilled&slotted rotor and a slotted-only rotor is not that much. One good upgrade for a rotor is cryogenic treatment. Cryogenically treated rotors give you a very long life rotor with much better fade resistance. Check out this website: http://member.newsguy.com/~nutech/frames.html

I have good luck with ceramic brake pads that I picked up from AutoZone, very low dust with very good performance.