There is a lot of basic brake info up on this site and on the internet that will help you determine the shuttering problem. If new pads were installed on old rotors with out "truing" the rotors first that alone could be your issue. A best practice is to replace rotors and pads at the same time as the costs are cheap. Quite a few owners have lots of success running two to three sets of pads per one pair of rotors. The rule of thumb is to measure the rotor thickness, replace as necessary and break in the pads correctly. If you try re -bedding the pads, your shuttering may go away as the pad material has not transferred to the rotor evenly.
An out of spec rotor is one that is not parallel on both sides or too thin. The thickness is stamped or cast into the face. As mentioned above a simple test using a dial indicator while the rotors are on the vehicle with the wheels removed. Takes 30 mins to confirm the status. Old saying in car repair world, Test, don't guess.
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2005 X5 4.8IS
The
Blue ones are always FASTER....
Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green