OK, so I had the tools left over from replacing the brakes on my R53 several years ago & offered to replace the front pads & rotors on my wife's '06 Cabrio S when the sensor light came on a week or so ago.

I only wish I'da put anti-seize compound on her rotor Torx bolts when she took delivery. 6 years later those bolts were seriously frozen on the back side of the hubs when I went to pull 'em today. They'd move maybe 2º back & forth under my T50 extension but nothing would get 'em to unscrew... not tapping, not penetrating oil, not heat... so I broke 'em off.

They LOOK like they're supposed to break off just between the heads & where the threads begin.

It ought to be fairly simple to get the remaining stubs screwed through the hub; drilling 'em out I risk damaging the threads though I have a proper tap to re-thread if need be.

Any suggestions for getting the stubs out so I can put new bolts in - this time with anti-seize

 

heat and wd40 is how i've done it on jeep rotors. i'm about to replace the rotors on my 03 cooper (original brake rotors with 110K) so i guess i'll see if it works again

 

an option - those bolts actually do nothing but hold the rotor in place during assembly until the wheel goes on. Once the wheel is on, that's what holds the rotor to the hub. You could just leave what you have, or cut 'em off flush.

 

We heat them up to get them off, just a small torch will work.