Anyone can now bleed their own brake systems* simply, quickly and without expensive special equipment. No more complicated procedures, simply push hole over the bleed nipple and loosen the nipple.
When pumping the brake lever, the valve at the end lets fluid out but no air in. There is an adjustable ball valve at the end of the hose that opens under pressure and prevents fluid from flowing back.
Important note: NOT suitable for ABS or Integral ABS systems, let an official dealer bleed the brakes for those models!!