Bench bleeding removes the air from the master cylinder prior to the installation of the master cylinder. Bench bleeding reduces the amount of bleeding needed after the installation of the master cylinder onto the vehicle.

1. Plug the outlet ports.
2. Mount the master cylinder in a vise with the front end tilted slightly down.
3. Fill the reservoir with clean brake fluid.
4. Stroke the primary piston about 25 mm (1 in) several times using a smooth, rounded end tool. Resistance to the primary piston travel will not allow the full 25 mm (1 in) stroke when air is bled from the master cylinder.
5. Reposition the master cylinder in the vise with the front end tilted slightly up.
6. Repeat the stroke to the primary piston of about 25 mm (1 in) several times.
7. Reposition the master cylinder in the vise to the level position.
8. Loosen the plugs one at a time.
9. Push the piston into the bore in order to force the air from the cylinder.
10. Tighten the plug(s) before the piston returns to the original position in order to prevent air from being sucked into the cylinder.
11. Fill the reservoir.
12. Perform the normal bleeding procedure after the master cylinder is installed.