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The "horns" on the rear caliper are there for an important element of rear-end crash safety. They transmit collision forces from a rear-impact from the bumper and body, through the large triangular pieces (just ahead of the horns, the ones that look like pizza slices), and into the "horns" -- and from there through the calipers into the massive solid rear axle. See how the "pizza slices" lie in line with the horns, allowing for verticle movement, and yet staying aligned, so that a crumpling of the rear is halted by the engagement with the heavy axle. This prevents excessive collapse of the rear passenger compartment, especially (but not just) in a wagon.