1985 300D - Caliper Troubles

[Ya Mar]

Hello All!

I was removing my calipers today and one of the caliper bolts came out in 2 pieces! It had snapped off. This was very sad.

I drilled out the broken off bolt but have now lost all the threads. I was hoping to drive in a bolt and let it make it's own thread but the metal seems too hard.

Does anyone have any ideas?

Is it at all safe to drive with just 1 caliper bolt?

Also, I need to bleed the front brakes but I can't figure out how I'm supposed to do that. Does anyone know?

Thanks!!