Master cylinders equipped with bleed screws may be bled independently. When bleeding the Bendix-type dual master cylinder it is necessary to solidly cap one reservoir section while bleeding the other to prevent pressure loss through the cap vent hole.
CAUTION
The bleeder valves must be closed at the end of each stroke, and before
the brake pedal is released, to insure that no air can enter the system.
It is also important that the brake pedal be returned to the full up position
so the piston in the master cylinder moves back enough to clear the bypass
outlets.