Fits S4, monoblock calipers, Code (A1), Guide Ultimate (B1), Guide RSC (B1), Guide RS (B1), Guide R (B1), Guide T (A1), Level Ultimate, Level TLM, and G2 Bleeding Edge technology makes bleeding brakes quick and simple. An updated fluid path and bleed porting make it easier to push fluid through the caliper. A dedicated bleed adapter plugs into the bleed port and seals the system to minimize air contamination and fluid loss Works with Avid/SRAM Pro Bleed Kits