Usually, if you get a pulsating pedal and the steering wheel vibrates when you apply the brakes, it would most often be a problem with a warped brake rotor. Sometimes, original equipment or aftermarket rotors could make the difference. Educated guess. Take a look at your rotors and see if they have a blue tint to them. If they do, that would indicate that they have been extremely hot. That would be a hint that you might have a stuck caliper. Hope this helps.