NOTE: The illustration shows the UMC-750SS B axis rotary. The UMC-750 B axis bleeding process is identical. UMC-750 B axis booster located on the side of the B axis rotary housing.
Make sure that the Schrader valve OPEN/CLOSE lever  is turned all the way out counter clockwise.
Install the bleeding tool onto the Schrader valve and tighten the nut  on the bottom of the tool.
Make sure that the oil reservoir on the brake booster is filled to the top line.
Route the 1/4" clear tube from the tool into the oil reservoir  on top of the booster.
Turn the Schrader valve OPEN/CLOSE lever all the way clockwise to open the Schrader valve.
Type the following code into the MDI:
G103 P1 ;
G04 P5. ;
G04 P5. ;
When running the program, observe the fluid movement in the clear 1/4" return line  between the Schrader valve and the fluid reservoir.
The fluid will move from the Schrader valve towards the fluid reservoir while the B axis brake is clamped.
Once there is no more air bubbles present in the line, run the program for an additional 20 minutes.
Once the system is bled, turn the Schrader valve OPEN/CLOSE lever  all the way counter clockwise and remove the bleeding tool from the Schrader valve.
Verify the brake system operation and enable the brake pressure monitoring.
NOTE: Refer to the Step 2 of the Evaluate the Axis Brake Operation section.