I just put powerstop rotors and axxis pads on my car today. I didn't trust myself to do the work, so I took my parts to a local brake shop and had them do it. I drove home from the shop (about 15 miles) with no problems until I was about to turn into my driveway when I heard a thumping sound. I tapped the brakes and it went away. Later while lightly braking I noticed that my brake pedal sort of shook or pulsated and the thumping noise returned occationally. Are these normal observations for new rotors and pads? Is it because the new stuff needs to break-in?