Brake bleeding has always been an inconvenient and messy job. Commercial shops typically use an expensive pressure bleeder which, unless used properly, can introduce air bubbles into the system through cavitation. Earl's SOLO-BLEED bleeder screws solve both problems. A direct replacement for the original equipment bleeders, SOLO-BLEED® allows one person to safely bleed brakes without a mess and with no chance of getting air into the system.