First, welcome to OCC.......
Yes, the 149 has a 14HP engine, hence the "14"9.
First thing I would check is the PTO bearing. Pull the PTO lever to "disengage" the PTO. There should be a gap in the clutch plates, if not adjust for same. The PTO should be free wheeling. If not, replace the bearing.
NO, your PTO is not the Brake type.
See link..........
PTO