Bled brake system. Used small hand pump to fill 5606 hydraulic fluid from the bleed fittings on each brake assembly. Replaced brake reservoir cap with fitting that had plastic tube attached to allow overflow into a clean container. Pumped both lines full and got rid of air bubbles. Pumped left and right brake pedals to release more air. Brakes were firm and parking brake held also. Brake reservoir level about 3/4" from full. Attached prop hub extension with the six 3/8" bolts provided. Torqued to 30 ft lbs using steps at 10, 20 and 30 in a star pattern. Safety wired bolt heads. Tightened tension on alternator belt and tightened adjusting bolts and mount bolts. Safety wired all bolt heads.