2006 Dodge Dakota

The brakes on my 4 door 2006 Dodge Dakota seem to grab the rotor without actually locking up. This has been an ongoing problem. My mechanic replaced the differential fluid, shortly after that, the drive shaft fell out. A different mechanic replaced the rear ABS sensor (middle, not hub). I added transmission fluid. This problem has stumped 2 mechanics and a transmission specialist.

I still do not know what is causing the problem. Any helpful information is greatly appreciated.