A thin layer of caliper grease on the backside of the pads should work. Why you have the pads off,replace them if they are more than 70% wore. Each caliber should be mounted by two bolts. Good luck.
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2010 Strat Deluxe, HK 3" Big Straights, Power Commander V, Big Bar Engine Guard, Avon grips, BaggerShield adjustable windshield, Rivco laydown license plate/tail light kit, Back-off Break Light Modulator, SD Diamond Star Headlight Modulator