Brake is safety issue, I would not play with it.
Park the car until you get replacement parts.
- If the bolt threads are stripped, then the solution is easy: new bolts from dealer (use realoem.com to find PN):
- The the caliper threads are stripped, then get a new bracket at local junk yard or ebay.
https://www.realoem.com/bmw/enUS/sho...diagId=34_1051