The Subaru Impreza Trailing Arm keeps the rear axle connected to the chassis, limiting unwanted axle movement to help facilitate vehicle stability and predictable handling. The Trailing Arm is a stiff linkage that pivots ahead of the axle. This enables the rear wheel to move over bumps while maintaining its fore-and-aft position. As a result, alignment and even tire wear are supported. The arm collaborates with links or a Panhard rod for lateral control in this layout. However, its primary function is restrained longitudinally. The bushings located at the chassis pivot serve to absorb vibrations and permit articulation of the Trailing Arm while the bushings or joints mounted at the wheel end secure the hub or axle housing in place. The construction of common control arms uses stamped steel, cast iron, or cast aluminum to achieve that balance of strength and weight. Durability will depend on the bushing integrity, as well as the ability of the arm to bend and resist corrosion. On Subaru platforms, the Trailing Arm also aids in cargo space by enabling a flatter floor, as noted in the Impreza. All Subaru Impreza models that utilize this arrangement rely on a single, purpose-built Trailing Arm to maintain Subaru Impreza ride quality.
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