Brake Nipples - Speed Bleeders and Brembo & Falcon standard brakes A speed bleeder is a brake nipple that has a valve inside to prevent air getting in. To bleed brakes you normally put pressure on the brake fluid (ie push the brake pedal down or have a gadget that pushes brake fluid at the reservoir) and quickly undo and do up the nipple. A speed bleeder makes it easy because you can just undo it a bit and pump away as much as you want, without air getting back in. Very useful. ie: For a