[DEIFAN]

I've just replaced both rear wheel cylinders, and in observing the cylinders the bleed screw is recessed in the cylinder housing I guess this is done so the screw nipple does not get knocked off
however it looks like there may be a special tool to loosen it to bleed the brakes, I cannot get a socket at it because the housing surrounds to close to where you would normally put a socket or
bleeder wrench at it. I went to the Auto parts stores in my area
and they told me a lot of people have been asking the same thing and nobody knows what to put on this valve, and I need to
bleed my brakes!!.[

 

[Zane M]

I've been able to get a socket on these replacements(1/4 drive). I don't remember the size off hand.

I also have a small wrench that I can get the box end over-this allows me to shut the bleeder without removing the hose.

 

[Dr.Fiero]

And don't use 'cheap' sockets, or 12 point ones. The 12 points will round off the bleeder, and the cheap ones are usually too thick walled to get in.