Vibration when braking

My daughter's car vibrates a lot when braking. I have changed the rotors and brake pads/shoes and bled the brakes. All four tires were replaced and an alignment was done right after. I took it for a test drive after and it still vibrates. It vibrates more with slight braking, if I use heavy braking its a lot smoother. Is there something else I should suspect? Wheel bearing, brake caliper? I am at a loss for what else could cause this. I would appreciate anyone's advice or experience on this. Thanks