rgipp1

21mm bolt that attaches caliber bracket was frozen or seized.

Did all the normal stuff to break it free like blaster spray, oil, pounding, heat, impact wrench.

I finally got a 42" breaker bar with 3/4 socket drive on it and it snapped.

How do I proceed to get the bolt out?

Is it threaded in to both the caliper holder and the knuckle?

kaneelschep

Are you talking about the brake caliper? Front or rear? The rear bolts are only stuck in the caliper bracket.
Front i didnt see yet. Only own my audi for a week ;-)