Help!!! Rotor or Caliper or Something Else!

[dandruff]

2001 X5 3.0i Step / 107K

Friday, the front end starts to rattle / shake / shudder / vibrate real hard .. steering wheel shudders real hard .. didnt feel as much (or at all) in the pedal tho) ... it had done that last week, and we took it in for balancing and everything was fine till it did it again, took it for balancing yet again and everything checked out ok - made them rebalance just to be sure, but this time the shudder wont go away.

Reached home all shook up, there was a slight burning smell on the passenger side front pads and rotors were hotter than the driver side.

Took the wheel off, used c-clamp on pads, nothing seemed amiss, took the caliper off and cleaned it, took it for test drive and everything was fine.

This morning while driving to work, everything seems normal except the passenger side is way hot (burnt finger to prove it ; and has the burning smell. Also very slight shimmy / shake in the steering wheel while braking.

So whats causing it? Warped Rotor or Stuck / Frozen Caliper or front suspension?

Warped Rotor : wouldnt that do it all the time tho? how do you check for a warped rotor?

Stuck Caliper: anything i can do?

Alignment : ?????

Suspension : with 107K i think its time for atleast sway bar end links but everything looked normal .. didnt see much play but I really dont know how to check most suspension for play either ...

Changed Rotors 5K miles ago with OE Brembos. Dont think they are fakes but who knows.

TIA!