Centric Parts brake caliper rebuild kits help restore your disc brake calipers to like new condition. These high quality caliper kits include major replacement parts such as O-rings and seals. Designed to meet OE quality, configuration, and fitment; Includes spring, cup seals and dust boots; Made of high-quality materials for long lasting performance; Sold as an axle set for two wheels 2008 - 2013 BMW 135i, 2013 - 2013 BMW 135is, 2013 - 2013 BMW 328i