Which procedure is NOT used for removing air from a hydraulic system?

Bench bleeding is a procedure that is typically used for bleeding hydraulic components, such as master cylinders, before installation into a vehicle’s hydraulic system. It involves filling the component with brake fluid and manually pushing the piston to expel air bubbles, but it is not a method used to remove air from an entire hydraulic system once it is installed.

On the other hand, power bleeding, manual bleeding, and vacuum bleeding are all techniques specifically designed to eliminate air from a complete hydraulic system. Power bleeding uses pressurized fluid to force air out, manual bleeding relies on physically pumping the brake pedal or actuator while someone else opens and closes the bleeder valve to release air, and vacuum bleeding involves creating a vacuum to draw fluid and air out of the system.

Understanding the distinction among these methods is critical for effective hydraulic system maintenance.