mt10 rear brake strangness

[dave001]

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

[Nobby the Bastard]

Now, I would expect the pad material to be exceedingly flat and not looking like the surface of the moon.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[dave001]

[dave001]

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

[Nobby the Bastard]

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?
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[dave001]

[dave001]

iv just had a thourt

if killed the orignal brimstone s22 rear since i had it and had two new road 5`s put on it

put on it the start of this year i wonder if they fucked it up when they had the wheel off and bent the pad some how

but nothing has show up to this week and last ride out

[Zen Dog]

[Nobby the Bastard]

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.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[dave001]

[Robby]

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.

[dave001]

[dave001]

[dave001]

[stinkwheel]

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.

[Zen Dog]

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
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My bike trip around S.E. Asia 2010/2011

[Nobby the Bastard]

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.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[Nobby the Bastard]

[Zen Dog]

[dave001]

[Easy-X]

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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Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[dave001]