I read all the post on breaking your reservoir to the rear breaks, and even tried the 16 mm and 14 mm wrench idea. But this bolt was stuck.
This is what I did and it worked slick!!! After exhausting all the ideas I saw here I fired up the air compressor and pulled out my 3/8 drive impact and at LOW air pressure I held the resv. with the 16mm wrench and gave it a quick burst with the impact and spun it right off.
Caution: I think I took a chance but from experience I thought it would work and it did. But I have used this technique with other projects, just not pot metal which breaks easy. So if you try this use Low pressure and a wrench to back up the resv.
Second thing, HOW in the world do you all get the pucks out of the break housing??