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Message: [QUOTE="6.7&1966, post: 1136346, member: 17744"] My '14 F350 FX4 started these same symptoms at about 15k miles while driving through mountain roads in the Carolinas. Fuel mileage was in the 18 mpg range on highways prior to the thumping. Suddenly fuel consumption was 14 mpg. It felt like an issue in the 4wd, either in the hub or transfer case. But, like previous post I can sometimes feel it through the brake pedal. Took it to dealer twice and of course they can't replicate so no solution. I recently drove 1200 miles without washing it and noticed the left front wheel had more brake dust than the right. I started to focus on the brakes and I tested it by super hard braking repeatedly. It was pulling hard left and using a digital laser thermometer saw that the left rotor was 50+ degrees hotter than right. On occasion I think I can feel the caliper thump, possibly fully release? I have an appointment Monday and will post results. [/QUOTE]

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