Steering wheel/front vibrate when braking at highway speed

It was driven the previous summer, and I always keep it in a dry, warm garage with concrete floor. Rear shoes and cylinders, springs etc was replaced 2 years ago and have not been used much. But I will have them apart too. One thing, would it not cause my brakes to be uneven during inspection? They were very even both in front and out back. Could a idler arm with play in it cause this too? I passed inspection with that idler arm, but I was under the car when they shook it and I could see the play myself.