The bump stops are the last line of defence against poor roads. Acting as a kind of progressive rubber spring, they ensure the shock does not foul against the body when the shock is fully compressed. Made from a high-density foam rubber, over time these degrade and must be replaced. We recommend changing the bump stops whenever replacing springs and shocks. Manufactured in Germany alongside BMW Genuine parts, these Vaico Q+ bump stops are a fraction of the dealership cost without any compromise in quality.