Snapped Bolt - Rear Caliper Mounting Bracket

[smithyithy]

Bike is a 1990 Honda CBR400RR - NC23.

My rear caliper had become a bit loose, and the only way I could see to tighten it was at the mounting bolt, you know the one you undo first before pivoting the caliper over the remove it?

So I was tightening it.. It was turning but not getting noticebly tighter, then snap! So it snapped inside. The bolt came out and I can pivot the caliper upwards, but the end of the bolt, the thread part, is snapped and stuck in the caliper mount.

So what are my options? The way I see it, I can either drill the bolt out but that would mean re-tapping a thread and getting a suitable new bolt, which might not fit through the caliper..

Or, replace the mounting bracket and bolt.

Any other ideas / suggestions?

Cheers, Chris.


Edit: managed to scan my Haynes manual at work, to kidna show the bolt, bottom right of the page, the second arrow points to where the thread is stuck in the mount.

[stickybackbob]

The only other option you have apart from those you have already mentioned is to try to weld a nut to the remains if the thread stuck in the bracket.

At an absolute push, you can try drilling the remains of the bolt with a smaller drill bit, tapping the hole, running a smaller bolt into the hole with a locknut on it. If the thread isn't seized, then you may be able to get it out but it's a long shot.

[Mark65]

Start with a small drill bit then progress til the bolt stud collapses and becomes loose then remove, I did it that way on the YBR sprocket carrier bolt that did the same.
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07 Yamaha YBR125, 07 Honda CG125 , 15 CBR300R (Chocolate Crank, Deaded), 16 CB500FA, 19 Honda Forza 300, 70 Suzuki SV650

[Islander]

How much of the bolt is sticking out on either side of the mounting bracket? If you can get something on the remaining thread to grip it you may be pleasantly surprised.

[smithyithy]

It's just below flush, so there's nout to grab onto, and unfortunately I have no access to a welder.

Drilling may be the option then, I'll have to see if I can get the remaining bolt out and save the mounting bracket..

No idea how it snapped though, I wasn't using much force on it and it just seems to be turning but not tightening

[Islander]

[lihp]

If it went in easy, an easy-out should work ok
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[gavbriggs]

If you can get some heat to it and some wd40!

Not at the same time tho eh

[lihp]

[c_dug]

Plus gas it to buggery to start with, then you have a few options, most have been mentioned already. Any chance you could make a slot in the end for a hefty flat head screwdriver? A small chisel may do the job.

Word of advice, try the least destructive methods to bolt first so you are not eliminating other options that may have worked.
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[ram33]

if you damage the thread while getting it out you can just put a helicoil in to keep the same thread

[Vincent]

With the price of decent drills, it may be cheaper and less hassle to try and find another caliper bracket. If you do have a go at removing the stud, remove the bracket anyway and get it in a vice - it'll make it a lot easier to work on. You might get lucky and find the hole with the broken stud in goes straight through, in which case, just drill it undone.
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[smithyithy]

Well my dad's got a tool to remove broken bolts and such at work so he's gonna get that and give it a try, he can get me new bolt too so as long as the bracket thread is fine then that should sort it.

If not, I've got a bracket on hold from a guy on another forum, so again, I'll just need a new bolt.

Still doesn't really explain why the caliper was loose though, that was the only bolt I could see to tighten and it didn't, it just snapped