Brake Disc Caliper problems of the 2001 Ford Excursion

Panic stop and vehicle pulled left so hard that it almost went through the center safety barriers on interstate. Pulled so hard that it felt like someone had grabbed the steering wheel and yanked it. Anytime you brake hard it progressively pulls harder to the left the more you apply the brakes. Also power-steering will disappear at slow speeds making it almost impossible to turn into parking lots. Dealer had vehicle for over 4 weeks. The Ford hot line had the dealer replace the front springs, tie rod ends, steering box, power steering pump, check alignment,try different alignment specs, balance & rotate tires, swapped calipers from side to side, put new calipers and pads on. Dealer drove two other Excursion's one new one & another customer's and they both did the same thing. Ford hot line has admitted to dealership they know of problem but don't know what else to try.

When applying the brakes truck pulls to the left or right very hard almost forcing steering wheel out of consumers hand. Consumer is concerned vehicle may tip over. Consumer took vehicle to Ford and the replaced the brake calipers. Please provide any further information. Ts.

When applying brakes hard, vehicle swerves left or right making control very difficult. On two occasions could not stay in lane. Have had it in dealer for this problem at least 5 times. Dealer has changed discs, rotors, pads, calipers, and have swapped parts from side to side. They have also changed tie rod. I have also changed shocks and tires. Dealer says they all do this. My wife will not drive this vehicle, and had there been cars in next lane I would have not been able to avoid an accident. To make it worse two people have just died in an Excursion when she lost control on highway in similar circumstances.