SRAM redesigned the caliper bleed port on their S4 monoblock calipers, which means the threaded bleed fittings in your existing Avid or SRAM bleed kit no longer fit. The Bleeding Edge Adapter bridges that gap, giving you a dedicated fitting that plugs into the smooth, non-threaded port on newer Guide and Level brake calipers. If you already own an Avid or SRAM Pro Bleed Kit and recently upgraded to S4-equipped brakes, this adapter is the missing piece that lets you keep using your existing syringes and fluid.

The adapter uses a push/pull locking mechanism rather than threads. You insert it into the caliper bleed port, rotate to lock, and the system seals. This eliminates the step of removing and reinstalling a separate bleed port screw, which speeds up the process and reduces opportunities for air to enter the system. When you push fluid through, the sealed connection minimizes contamination and keeps DOT fluid where it belongs rather than dripping onto your rotor or pads.

Compatibility covers the B1 generation of Guide brakes including the Guide R, RS, RSC, Ultimate, and T models, plus the Level Ultimate, Level TLM, and G2 calipers. If your caliper has a smooth bleed port without threads, you need this adapter. If your caliper still has the traditional threaded port, your existing bleed fittings will work and you can skip this purchase. The quickest way to check is to look at the bleed port location on your caliper and see whether it accepts a threaded fitting or has a smooth opening.... Read More