Haas Alarm: 643 (M) LOW BRAKE OIL A-AXIS – The oil level in the air/oil booster, supplying hydraulic pressure to the A-axis brake, is low. The booster is located on the front of the machine’s table. Access the booster fill fitting and add Mobile DTE 24 oil to bring the oil level to the high oil level line marked on the booster. If the alarm reoccurs within 90 days, contact your Haas Dealer for service.