stuck brake bleed screw

[evanphi]

My 10mm brake bleed screw is stuck on my 1975 CB750. There is a fair amount of rust. I need to bleed the system, possibly do a caliper rebuild. I've sprayed the screw liberally with WD40 and let it sit overnight.

Any tips?

 

[Rich Ard]

In to hear answers from others. At this point I drill them and retap as I've broken a couple, and then trashed the caliper trying to get the rest out :

 

[Great Saturn Z]

I've had better luck using PB Blaster over WD40. Little heat might also prove useful.

 

[Adamantium]

Don't just spray it, take it off and let it soak in it. I lost a caliper after my bolt broke right off in it.

 

[johngofast]

Soak it overnight in PB Blaster or a 50/50 mix of acetone and ATF.

 

[SONICJK]

Heat it real hot, then cool it fast, then heat then cool. then try again

 

[Tugboat]

If it does break, or you can't otherwise get it out... Mine had broken off flush with the caliper on my CB750F, so I sent it to Speed Bleeder (in GA?) and for $15 - including return shipping - they drilled out the old one and installed a Speed Bleeder. Good luck!!

 

[o1marc]

Sonic has the easiest answer. It may not take multiple heatings. Take a propane torch and heat it hot, the aluminum caliper will expand faster than the steel bleeder and break free. Soaking in WD40 or PB blaster will definitely help.

 

[SONICJK]

If it does break, or you can't otherwise get it out... Mine had broken off flush with the caliper on my CB750F, so I sent it to Speed Bleeder (in GA?) and for $15 - including return shipping - they drilled out the old one and installed a Speed Bleeder. Good luck!!

Hey,
thats pretty cool!
Good tip

 

[evanphi]

PB Blaster did it! I soaked it about 5 times last night over the span of 6 hours. I went outside this morning and gave a little twist with the 10mm wrench. Bam! It moves!

Thanks folks. This can of smelly stuff will be in my toolbox forever.

 

[cbcafejunkie]

PB is Great stuff! Marvel mystery oil works great also!

 

[hc243102]

I had this same problem. Now the caliper sets in my garage with a sheared off easy out stuck in it. It turns out they're not as their name suggests.

 

[hillsy]

I had this same problem. Now the caliper sets in my garage with a sheared off easy out stuck in it. It turns out they're not as their name suggests.

Yep - EZ outs are anything but in my experience.


You could try putting a nut over the bolt and weld it. Go from the inside of the nut. The heat will help loosen the bolt and the nut will give you something to turn.

 

[Scruffy]

Heat the metal around it, while still warm, drip on some candle wax, reheat and watch the wax get sucked into the threads. It will come out, used that trick to remove damaged percussion cap nipples on a late 1860s double barrel 12g muzzle loading shotgun. Patience and heat will usually do the trick.