:xoutpost: Glad to see another X3 owner. Post up pics when you can!

As for your slight jerk when braking, it may be the gearbox problem listed in the threads above, but that's usually a hesistation problem when you accelerate. If it's very slight, then it may be normal. Then again, it never happens on my 5-speed. It could be related to the brakes since there's that Comfort Stop thingy that's programmed into the braking system. If it annoys you, bring it to the dealer.

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2014 Mazda 3 GT: Ø Consumption: (click for details)