Also called the lower limb arm rubber sleeve, is a rubber sleeve connecting the triangular arm on the chassis, and the hard rubber is cushioning when it passes. If it is bad, the triangular arm will impact the chassis. My old Polo is, but the new Polo is said to have been cut down. It is not clear whether or not.

The triangle arm (Arm triangle), refers to the swing arm, the role is to balance the supporting role. The car runs on the uneven pavement, the tire will swing up and down, that is, by the swinging of the triangular arm. The tires are mounted on the axle head, and the axle is connected by the ball head and the triangle arm.