Automatically set trailer brakes in case of accidental trailer breakaway
Required by law in some states
Emergency use only, not to be used to lock brakes when parked or stored
All metal parts and a brass pin assembly
Completely sealed breakaway switches to automatically set trailer brakes in case of accidental trailer breakaway. Required by law in some states. Emergency use only, not to be used to lock brakes when parked or stored. 2009 has all metal parts and a brass pin assembly.