PB Blaster or AeroKroil (I prefer Kroil). Let it soak for a day or two. Drill 
out bleeder hole (not too deep, you don't want to go through to the caliper). 
Use a Craftsman square screw extractor (smallest size I think), and hope for 
the best. Time is your friend when using penetrating solvents. I have tried the 
acetone/ATF combo, but I have not had that much success. AeroKroil works better 
IMHO. It is priced accordingly, though. 

Rick
Sent from my iPhone

On Jul 16, 2011, at 5:29 PM, [email protected] wrote:

> Began working on my recently acquired '83 300D. The brakes are weak so I 
> started with that project. The brake fluid was coffee colored so I decided to 
> flush the system. Bled the passenger rear but the driver rear was tight. It 
> rounded a bit so I switched to vise grips. The screw snapped right off. It 
> was the only 8 millimeter size on the car, all others are 9.
> It looks too small for my Craftsman easy-out set to work. Looks like I will 
> have to drill it out. It will be a pain to remove the caliper and drain the 
> system. Any easy methods to remove it?
> 
> 
> Alan Duff
> Knoxvlle TN
> 
> 
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