Second post in as many days. 2008 Lemond poprad disc, ridden less than a week. Has from the start what I think is severe front disc brake shudder, even with less than maximum braking. Have tightened headset preload, cleaned rotors with isopropyl alcohol, tightened bolts, and checked for trueness. LBS says this is normal for new discs, but I'm incredulous. What do you gurus think?