Broken Brake Bleeder valve

Is it tight now? If so, you may want to run it as is & fix it the next time you are working on those brakes. To repair this, you almost always have to remove the cylinder from the backing plate to get enough room to remove the broken bleeder valve.

How far into the cylinder is the brake? They usually break off flush with the edge of the cylinder. As you have probably guessed, some kind of easy-out will most likely be involved. Unless the break left enough of the bleeder valve sticking out that you could get a pair of Vice-Grips on it, it is easy-out time.

If you can not remove it with an easy-out, then it is off to the machine shop for you. Before you go though, check to find out if it is just cheaper to buy a new cylinder.

There is a tapered seat at the bottom so be careful when trying to drill it out so that you don't ruin the seat surface. I rarely endorse the use of an easy out because they often break off in the hole and make for a really expensive extraction at the machine shop. In this case however, the cylinder doesn't have a lot of value making machine shop extraction not really a cost effective option. So try an easy out and if it breaks off, just buy a new cylinder. Another option is to weld a nut to the end, but the residual brake fluid will most likely be a problem.

Buy a new cylinder.