Bad Boy Mower 050-4035-00 Brake Arm Kit. This kit will is for the park brake arm on Bad Boy MZ & MZ Magnum mowers. There are two 050-4035-00 per mower, once for each hydro. If the cog wheel on the park brake is also worn consider buying the 050-4032-98 MZ Brake Cog Kit which includes the 050-4035-00 Brake Arm and the Cog Wheel with Snap Ring.