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mt10 rear brake strangness

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Nobby the Bastard
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PostPosted: 19:24 - 03 Feb 2023    Post subject: Reply with quote

Now, I would expect the pad material to be exceedingly flat and not looking like the surface of the moon.
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Nobby the Bastard
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PostPosted: 19:39 - 03 Feb 2023    Post subject: Reply with quote

When you say 'brake pressure' do you mean pressing the brake and it goingg straight to the bottom with next to no resistance as if there were no fluid in it or do you mean the pedal was firm but the brake didn't work?
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Zen Dog
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PostPosted: 22:06 - 03 Feb 2023    Post subject: Reply with quote

dave001 wrote:
iv just had a thourt


Are you sure? Razz

Personally I think you got a stone or something jammed in it, and it bent the pad and pushed the pistons in on entry (which is why it felt like no pressure, because your first few pushes of the lever are just pushing the pistons back out). Then it got trapped in the caliper housing, rolling around, hammering the edge of the pad until it disintegrated into grit and fell out.

You'll probably never know for sure. But I'd be carefully checking for damage, especially the inside of the caliper (where something might have been trapped), the pad pins for bending etc. And I'd have the wheel and disc off and carefully check the disc too.
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Nobby the Bastard
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PostPosted: 22:17 - 03 Feb 2023    Post subject: Reply with quote

Sorry, but stones don't get jammed between pad/disc/piston unless there is a gap for a stone to get jammed in, which you wouldn't have unles the pad was already well away from one of them.

I've never even heard of it happening.
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Robby
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PostPosted: 22:22 - 03 Feb 2023    Post subject: Reply with quote

The brake fade was from boiling brake fluid, from the bent pad being in contact with the caliper. That heat may also be why the pads look melted.

New pads, new pins, new fluid.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 22:37 - 03 Feb 2023    Post subject: Reply with quote

Looks cooked. I think Robbys explanation is most likely. I've also seen that happen with pads rusted to the disc (which can happen overnight given enough heat and salty water).

Check the rotor isn't warped because you can also loose brake pressure due to a warped rotor pushing the pistons back in. You do this using a dial guage indicator, not by looking at it because maximum rounout on discs is in the region of 0.3mm and you can't see that by eye.
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Zen Dog
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PostPosted: 22:44 - 03 Feb 2023    Post subject: Reply with quote

It's obviously incredibly rare, whatever it is. I've never seen it. So maybe the cause is something I haven't heard of either.

I'm assuming that the force is acting on the pad backing plate initially, bending it and pushing the pad away from the disc. And there is a gap to get to the backing pad, even when the pad surface is against the disk. Imagine a small stone gets flicked up and caught by one of the ventilation holes on the disc just as it enters the caliper or something.

I mean it's incredibly improbable. But it's a guess based on minimal evidence and idle speculation, what do you expect? Razz

https://i.imgur.com/nlrY8El.png
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Nobby the Bastard
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PostPosted: 22:47 - 03 Feb 2023    Post subject: Reply with quote

Robby's explanation seems the most likely on the basis that I think it could possibly happen and can't think of any other way it could.
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Nobby the Bastard
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PostPosted: 22:49 - 03 Feb 2023    Post subject: Reply with quote

Zen Dog wrote:
It's obviously incredibly rare, whatever it is. I've never seen it. So maybe the cause is something I haven't heard of either.

I'm assuming that the force is acting on the pad backing plate initially, bending it and pushing the pad away from the disc. And there is a gap to get to the backing pad, even when the pad surface is against the disk. Imagine a small stone gets flicked up and caught by one of the ventilation holes on the disc just as it enters the caliper or something.

I mean it's incredibly improbable. But it's a guess based on minimal evidence and idle speculation, what do you expect? Razz

https://i.imgur.com/nlrY8El.png


Ifa stone were to get into the hole and then manage to stay there after it got to the pad I'd expect the back wheel to lock up and/or horrific damage to the calliper.
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Zen Dog
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PostPosted: 23:01 - 03 Feb 2023    Post subject: Reply with quote

Nobby the Bastard wrote:
Ifa stone were to get into the hole and then manage to stay there after it got to the pad I'd expect the back wheel to lock up and/or horrific damage to the calliper.


Me too in all honesty. I imagined it in my head bending the pad away from the disc, but looking back at OP's pics, the pad is actually bent IN, towards the disc. So I really have no idea how that would happen, outside of someone bending the pad before installation.
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Easy-X
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PostPosted: 11:12 - 04 Feb 2023    Post subject: Reply with quote

The important takeaways here: new pads, new fluid and a clean up will fix this. Will it happen again? Probably not.
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