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Run the first line of the program to release the brake.

N01 M11 //Disengage Brake.

After the brake has been disengaged remove the air line from the unit and unscrew the front enclosure. 

Check if the clear hose on the booster reservoir [1]. If it has any bulges, drips, wetness, or is not connected. If any of those apply contact Haas service for instructions. Check the booster reservoir spring. It should be somewhere in the middle neither fully extended or fully contracted. [2] 

The item labeled [3] is the vacuum barb on the booster reservoir.

Attach the vacuum hand pump to the barb fitting on the booster reservoir. [1] 

Remove top enclosure cover and remove brake fluid plug. Attach the bleeding tool to the fluid port. Be sure to grab the tool at the cross point [1], it only needs to be hand tight. Once in place open the valve on the bleeding tool.

Pull vacuum on the hand pump until the booster reservoir spring is fully compressed. Roughly 22 inHg of vacuum.

Note: Close tooling valve (valve handle should be perpendicular to the pipe fitting)

Relieve the vacuum it's gauge should read 0 inHg.

Connect air back to unit. 

Verify that gage on bleed tool reads 0 PSI.

Each indented and italicized line is a line from the program that needs to be run for this procedure. The program can be found at the bottom of this procedure. After running the line of code follow the instructions below that line in this step. Put the machine in single block mode while doing this procedure.

N02 M10 (Engage Brake)
Open the tooling valve to burp.

N03 G04 P15. (Wait 15 seconds)
Wait 15 seconds then close the tooling valve. 

N04 M11 (Disengage Brake)
You will see the reservoir spring extending to fill the fluid void. It will take a few seconds for the spring to extend. 

N05 G04 P5. (Wait 5 seconds)

N06 M10 (Engage Brake.)
Open the tooling valve to burp.

N07 G04 P15. (Wait 15 seconds)
Wait 15 seconds then close the tooling valve. 

N08 M11 (Disengage Brake.)

N09 G04 P5. (Wait 5 seconds)
Wait 5 seconds. 

N10 M10 (Engage Brake)
Open the tooling valve to burp.

N11 G04 P15. (Wait 15 seconds)
Wait 15 seconds then close the tooling valve. 

N12 M11 (Disengage Brake)
Open the tooling valve.

Pull vacuum on the hand pump until spring is compressed.

Note: Repeat the burping cycle until all the air has been removed from the brake. The reservoir should be full and the spring fully compressed.

Disconnect air and close the tooling valve.

Note: It is important that the vacuum is still pulled when unscrewing the bleed tool. 

Unscrew the Bleeding tool by holding it at the cross point. 

Add a small amount of oil to top off the brake fluid. Open the tooling valve above the port to use the excess brake fluid from in the bleed tool. Not much oil will be needed so add the oil slowly. 

Reinstall the brake port plug. Make sure the O-ring is installed and properly seated on the plug. If it is not the unit may leak oil. After the plug has been screwed in clean the excess brake fluid off the top of the rotary. 

Release the vacuum and disconnect the vacuum tool clear line from the booster reservoir hose barb fitting. [picture]

Connect the rotary to its air supply. 

Check the diagnostic page to ensure the pressure switch changes state when the brake is toggle on and off. “CH 4 [A] Axis Brake Air Pressure”

    a. Brake ON = 1

    b. Brake OFF = 0

Turn the break off when done testing. 

Put the front cover back on the unit. Be sure the O-ring seal is properly seated in the groove.

This O-ring keeps coolant and other fluids out of the rotary. If the O-ring is not properly seated or is damaged Coolant may get into the unit and damage it.

The right side of the image shows what a well-placed O-ring looks like and the left side of the image shows what an incorrectly place O-ring might look like.

When the O-ring is properly placed in its groove it should only be slightly higher than the area around the groove.

If is significantly above then the O-ring may not be properly placed or may be damaged. If it is below the area around the groove then it might be damaged.

If the O-ring is damaged then it needs to be replaced. Once the O-ring is seated properly and everything is clean screw the front and back covers on.