Caliper Mounting Bolt- worn down

[GSinDC]

Started on a front master cylinder/caliper rebuild today, but one of my mounting bolts wouldn't come off (14 mm right?). The shoulder got all worn down, and now it is basically junked. Obviously it was either overtightened or has never been taken off since it rolled off the factory line.

So- any recommendations on how to get this out? The head is still on it but no sockets or wrenches will bite with enough torque to loose this stubborn guy.

[7981GS]

After soaking the threads over-night with your favorite penetrating oil...
You are using a 6-point impact socket and an air gun to get it off, right?

Daniel

[GSinDC]

That would be a no on both counts... Used a regular old socket, and apparently have learned my lesson! Would an impact socket work at this point? With the shoulder so destroyed?

[7981GS]

Yes, with a six-point impact socket.

Daniel

[SVSooke]

You are using 12 point sockets????Go invest in some real tools,all your projects will thank you!

[GSinDC]

Bolt rescued! Turns out one of my friends has a Dewalt impact driver and some nice sockets. With a little PB Blaster to loosen it, a few bangs with a hammer to break it free, and 1 second with the impact driver it came right out.

Of course, at that moment I wasn't ready to do the teardown, so we put it back together with a little anti-seize.

Thanks for all the suggestions and help.