Brakes locking.

[bwhitley]

Can someone give me suggestions on what has occurred. When backing into the garage all the brakes locked,I noticed my 5 way connector was loose and upon examination,noticed one of the prongs had broken off.I replaced with another 5 way connector and thought everything was fine, but the rear wheel on the passenger side continues to lock up only when backing.Everything works fine going forward.
Any ideas on what to do or what the problem is ?

[CatFan]

You aren't getting power to your solenoid or it has gone bad. Do the backup lights on the truck work?

[Pokie Pa]

Check your tow vehilce tow fuse. Mine won't brakes lock and that is
the problem