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Tire Swap, Now Brake Grabs?


hammer

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There's a simple fix here somewhere... take it all apart and wheel off and reassemble taking your time. Pay close attention to spacers, caliper movement, disc alignment. Piston/pad movement. Grease where necessary. Check if it all goes tits up when axle bolt tightened.  Don't rush the job. 

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5 hours ago, Dodgy Knees said:

There's a simple fix here somewhere...

Exactly!  If it worked before the wheel was removed and then doesn't work anymore when reassembled, the answer is somewhere in the assembly.

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***2015 Candy Red FJ-09***

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17 minutes ago, hammer said:

IMG_20200526_100308.jpg

 

 

@hammer - One more thing to check...  When you had the wheel off to change tires, did you remove the sprocket carrier /cush drive from the wheel?  The sprocket carrier separates from the wheel and has the rubber dampers inside, separate it from the wheel and re-seat it, make sure it is fully inserted in the hub.

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***2015 Candy Red FJ-09***

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28 minutes ago, betoney said:

@hammer - One more thing to check...  When you had the wheel off to change tires, did you remove the sprocket carrier /cush drive from the wheel?  The sprocket carrier separates from the wheel and has the rubber dampers inside, separate it from the wheel and re-seat it, make sure it is fully inserted in the hub.

Nope, didn't touch anything past the sprocket. 

So everything is back in place. Chain is adjusted etc etc. 

No brake grabbing, rubbing or grinding but I haven't hit the pedal yet...

10, 9, 8, 7, 6.....

IMG_20200526_105606.jpg

And failure! Back piston won't release. 

Bike for sale! Lol

Edited by hammer
Cheers!
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30 minutes ago, hammer said:

Nope, didn't touch anything past the sprocket. 

So everything is back in place. Chain is adjusted etc etc. 

No brake grabbing, rubbing or grinding but I haven't hit the pedal yet...

10, 9, 8, 7, 6.....

IMG_20200526_105606.jpg

And failure! Back piston won't release. 

Bike for sale! Lol

Finally, a voice of reason, sell that crap. I don’t know but it’s possible that you have a bad caliper, I mean that never ever happens right? No way they could make a bad one or it just happen to go bad when you changed the tire......nope, completely impossible. 

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49 minutes ago, hammer said:

Nope, didn't touch anything past the sprocket. 

So everything is back in place. Chain is adjusted etc etc. 

No brake grabbing, rubbing or grinding but I haven't hit the pedal yet...

10, 9, 8, 7, 6.....

IMG_20200526_105606.jpg

And failure! Back piston won't release. 

Bike for sale! Lol

is this with the caliper bolts installed? it still looks like your brake pad is not sitting parallel to the rotor. something is wrong somewhere here..... are your caliper pins bent? the caliper shouldnt just lock up like that with a tire change.

EDIT: if you rotate the wheel with the caliper off, can you see any waves in the rotor side to side?

Edited by trevinator
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25 minutes ago, hammer said:

Ordered a piston kit and new pads.

Is it possible that the first assembly was off kilter and damaged the piston/caliper on first hard use? That first set of photos showed the caliper not sitting quite right. Could be worthwhile taking the caliper apart to inspect for damage. Anyway... curious to know what you find, and good luck with the repair.

Edited by piotrek
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20 hours ago, piotrek said:

Is it possible that the first assembly was off kilter and damaged the piston/caliper on first hard use? 

My thoughts exactly.  When you noticed that the bike feels harder to push around the garage after reinstalling the wheel, that would have been the time to stop, investigate, disassemble etc.  At that point things might have been reversible.  Taking the bike for a spin and stepping on the brake lever may have been what caused the real damage.

Any time you perform work on the bike and something seems slightly amiss after it would be best to not ride until all things are put back to normal.

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Sounds like the rear master cylinder valving might have gone sideways...

Most likely due to installation error (spacers on the wrong side, or maybe you didn't seat the sprocket carrier well enough) when you put it back together....and if the caliper was binding and you rode it anyways, it got real hot and boiled the fluid...thus damaging the piston seals as well. 

 

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