Maui
Well-known member
I have sheared bleeder screws off before, and it has almost always been followed by prolonged episodes of profuse swearing. I HATE IT when that happens!
No need to be "terrified". The most-common broken bleeder screws are on drum brake wheel cylinders not disc brake calipers. And of those, old Fords seem to have the smallest, weakest bleeder screws.
WHEN you break one--and you will, someday, if you work on enough brake systems--you merely replace the wheel cylinder or caliper. It might be possible to extract the broken bleeder screw and then replace it with a new one...but it's hardly worth the trouble.
Bleeder screws break. The female threads and the seat are rarely damaged. But the wheel cylinder/caliper may be damaged from the old, contaminated fluid.
IF you break something, go to any parts store in America and get a "rebuilt" or new wheel cylinder/caliper. Don't keep this sort of "emergency part" in stock.

Agree used a regular combination wrench was tricky on a 18 year old truck in the rust belt.Trucks with drum brakes you definitely need one. The bleeder is in narrow space between the backing plate and the leaf springs. A regular box end with an angle you can't get on the bleeder square. An open end would work if the stuff is new but any rust and age good luck.
Think it's still better than a flare nut wrench or an open end wrench. Unless it's really rusty and rounded, the 12 point performs just the same as a 6 point.Am I the only guy here brave enough to use a 12-point wrench on a bleeder screw?![]()