STEP1. First remove the hose connector and drain out the old oil in the car's brake master cylinder.
STEP2. Fill the oil replenishing tank with new brake fluid and turn it upside down to fix it on the brake master cylinder oil tank.
Open the valve switch and start automatic refueling. When the pressure at the spout is equal, stop refueling and there will be no overflow.
STEP3. Connect the air compressor pipeline and drain out the old oil from the brake cylinder. Pay attention to the sealing between the oil drain nozzle and the oil drain screw. Apply butter and grease on the oil screw.