Designed to get your Hayes hydraulic disc brakes performing at their best again with an annual bleed or after shortening hoses is its Pro-Bleed Kit. The kit includes 2 syringes for moving its included DOT 4 brake fluid from the master cylinder to the caliper. Quick connect fittings allow for easy, drip-free servicing and the kit is housed in a reusable plastic container with locking lid for travel or in the workshop.