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dave001 |
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 19:18 - 03 Feb 2023 Post subject: mt10 rear brake strangness |
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re my last post about rear break loss of pressure
striped and clean it and put in new brembo pads frount and back
but when i got to rear
look at these photos it was prity clean and pistions were not sezzed at all but pad pin was cruded up
this is the under side ie point down to road so i had not seen it
https://i.postimg.cc/3x9LQvXd/indx.jpg
one of the pads is bent and looks twisted see here
https://i.postimg.cc/13YpKc0c/ineedex.jpg
disk dont seem to have warped there are some very light hot spots but its not scored where you could feel it with a finger nail
https://i.postimg.cc/QCb7Kpx7/indrrex.jpg
bikes only on 5000 or so miles
i brourt at 1183 miles after it had its first service
they are the original new yamaha pads in it from factory
and no one has touched it since iv had it and thers been no need for me to untill now
any idear what the hell has happend too that pad to bend and twist it
i dont use rear much and i dont realy cook it on road epecily the rear brake
never seen a pad like it before |
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Nobby the Bastard |
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dave001 |
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 19:38 - 03 Feb 2023 Post subject: |
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thers a better pic of disk here in better light
https://i.postimg.cc/pXXDwXZd/index.jpg
bear in mind ther was no sign of this the last but one time out on bike |
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Nobby the Bastard |
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Zen Dog |
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 22:06 - 03 Feb 2023 Post subject: |
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dave001 wrote: | iv just had a thourt |
Are you sure?
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. ____________________ Current - '94 VFR750FR, '00 VFR800FI Previous - '10 Street Triple R, '92 MZ ETZ301, '05 TTR250, NSR125R, KMX125, "Honda" Win (chinese copy of an old Honda design with a C90 engine)
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 22:37 - 03 Feb 2023 Post subject: |
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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. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 22:44 - 03 Feb 2023 Post subject: |
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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?
https://i.imgur.com/nlrY8El.png ____________________ Current - '94 VFR750FR, '00 VFR800FI Previous - '10 Street Triple R, '92 MZ ETZ301, '05 TTR250, NSR125R, KMX125, "Honda" Win (chinese copy of an old Honda design with a C90 engine)
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![Post Post](templates/standard/images/icon_minipost.gif) Posted: 23:01 - 03 Feb 2023 Post subject: |
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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. ____________________ Current - '94 VFR750FR, '00 VFR800FI Previous - '10 Street Triple R, '92 MZ ETZ301, '05 TTR250, NSR125R, KMX125, "Honda" Win (chinese copy of an old Honda design with a C90 engine)
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