Possible that the rear sensors are broken.
Front Brake Rotors can be a pain, I would recommend going to your local Pepboys, Kragen, O' Reilly's or AutoZone Near you. They will need your year and model of vehicle.
You either have a bad brake caliper or the brake hose is bad.
A frozen brake caliper or if you just instaled new brakes and rotors you might have oil on the rotors as they need to be clean before installing.
I just paid $500.00 to replace all brake pads and the front rotors
You probably have a warped brake rotor. New rotors are fairly inexpensive, I would replace both front rotors and brake pads while your in there. The calipers and sliders along with the brake hoses and lines need to be examined also.
Because the front rotors are warped. You might want to replace the rotors or resurface it.
The most likely problem is warped rotors. Have rotors turned or replaced. Replace front brake pads.
You probably have severely warped front brake rotors. Machining or replacement of the rotors would be necessary to correct the problem
Your front brake rotors are warped. They need to be removed and turned true on a lathe. Many auto parts stores offer this service.
One of the two brake rotors on the front is warped. You can either buy new ones or get them machined if they aren't very old. sounds like one of your rotors is warped.
The front rotors are out of round are warped. Turn are replace rotors and be sure to replace the brake pads even if thay look good. I would also check the tie rods too.