abs comes on and stops vehicle when driving. If I try to continue 4x4 comes on. on 2007 Ford Explorer

this happens when ever I try to drive the car can't drive 20 feet without abs light coming on along with airbag. brakes continue to grab not allowing to continue. the 4x4 comes on if I try to continue. Reverses with no problem.

Asked by for the 2007 Ford Explorer