Master Cylinder Bleeding

Bench Bleeding Master Cylinder:

1. Support the master cylinder body in a vise, and fill fluid reservoir with heavy duty DOT 3 brake fluid.
2. Install plugs in the front and rear brake outlet ports. Bleed the rear brake outlet system first.
3. Loosen the plug in the rear brake outlet port. Depress the primary piston slowly to force the air out of the master cylinder. Tighten plug while piston is depressed or air will enter the master cylinder.
4. Repeat this procedure until air ceases to exit at the outlet port.
5. Repeat steps 3 and 4 for the front brake outlet port with the rear brake outlet plugged.
6. Tighten the plugs and try to depress the piston. Depressing the piston should be harder after all air is expelled.
7. Install the cover and diaphragm assembly making sure the cover retainer is tightened securely. Remove the plugs.