2004 Ford Expedition, When braking not so much a vibration in the front but acts like a high spot on the rotor or that its warped. Its getting worse we're almost headbanging. Replaced pads and rotors was not as bad at first but getting there. Greased the caliper guides well. Mostly feels like right front. I believe it might be caliper, anyway to tell for sure? Would bleeding help?

Rebleeding can help. Always start on the longest line first. Passenger rear, Drivers rear, passenger front, then drivers front. You can also have a diagnostic machine hooked up to the ABS which will tell if there is a problem in sequential braking.

The ABS has its own valving and seals and sits in the middle of the flow to the brakes. The internal valving works on electric and that can be checked with a diagnostic plug. The Dealer will have one. It takes a better, more expensive scanner to do it aftermarket. Some Autozones, Oreillys, or Advance autoparts may have the more expensive scanner.

Sometimes it takes a power bleeder to overcome the ABS valving. I have had problems with Brake rotors on a 1999, 2002, and 2004 Ford products and usually in the front. I can give you several suggestions. Replace the front rubber lines. Under pressure fluid will flow to the caliper, but if the hose is getting smaller inside due to deterioration, it depends on gravity to return to the master cylinder. Your caliper will not fully retract and your brakes will overheat and warp.

Check out NAPA rotors compared to what you put on. I hope my solution is helpful to you.