Avid disc brake bleed kit avids drip free bleed kit is the super easy way to keep your avid hydraulic brakes working up to their maximum potential the kit uses 2 drip free syringes one on the lever end and one on the caliper end to create a perfect vacuum to quickly and simply bleed your brakes to regain the power and modulation that avids brakes are well known for two versions available one includes 4oz of dot 51 brake fluid and one does not two syringes torx wrench and required fittin