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2009 And 2010 Caliper Bolt

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During the 2009 model year, Ford made a change to the caliper bolt size on the F-150. Here you can see the smaller bolt they used in early '09 compared to the larger bolt they used after that. If your F-150 has the larger caliper bolts, you'll need to enlarge the caliper boltholes in the knuckles using a 41/64 drill bit.