You may want to check your brake fluid levels, maybe bleed the system for shits and giggles, taking the tires off may have thrown them out of balance, check to be sure the rotors aren't lose(?). These are just ideas, I could be way off. I hope to be changing my brakes soon, and I'm going to couple that with a system bleed and rotate and balance of the tires. Now if I could just find the money ....
<span style='color:green'>Nobody likes you.</span><img src='http://www.bmw-forums.com/forum/html/emoticons/ph34r.gif' border='0' alt='user posted image' />
<span style='color:green'>Are you experienced, little girl? I want to know what goes on in your little girl world.</span>
<span style='color:green'>I'm the man! I'm bad, I'm so bad I should be in detention. I'm the man!!!</span>