Warped disc
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It might be helpful to include more information such as the YEAR of the bike. Were you feeling any pulsing in the front through the levers? Did it feel strange braking from the front? Also, I've never heard of a rear rotor warping, not to say it can't. How do they (MOT) determine if a rotor is warped? So was the rear warped or just worn out (never heard of that either). How many miles on it?
Agreed, we need more info in order to help
An introduction in the relevant section would be the recognised route for a new member too
There is a wealth of knowledge and help on here :smiley:
Is it you who has asked this same question on facebook ?
Quote from: virginiajim on June 12, 2016, 02:42:21 PM
It might be helpful to include more information such as the YEAR of the bike. Were you feeling any pulsing in the front through the levers? Did it feel strange braking from the front? Also, I've never heard of a rear rotor warping, not to say it can't. How do they (MOT) determine if a rotor is warped? So was the rear warped or just worn out (never heard of that either). How many miles on it?
Hi the bike is 2008 with only 11000 miles on the clock can't feel no vibration through the brake lever been told to try a new garage for a second opinion
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A warped disc will not (on its own) be an MOT failure. If the warped disc causes inadequate braking performance then that would be the reason for the failure.
Cheers
Paul B.
So how do they tell? Do they ride the bike and test it and if so, that's pretty subjective.
Nah, it's tested on a rolling road.
What ya need to do is clean the bobbins on the front brake disks.
The rear is a fixed disk.
Yes, it is common, sometimes the bobbins jam and the disk wears oddly.
Clean out the bobbins with brake cleaner until they can rotate freely and then see how it is.
Quote from: cashst on June 12, 2016, 03:08:41 PM
Hi the bike is 2008 with only 11000 miles on the clock can't feel no vibration through the brake lever been told to try a new garage for a second opinion
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thats low mileagr for a 2008 bike.
Boomer is right on the money with his suggestion.
Quote from: Boomer on June 12, 2016, 05:28:04 PM
Nah, it's tested on a rolling road.
What ya need to do is clean the bobbins on the front brake disks.
The rear is a fixed disk.
Yes, it is common, sometimes the bobbins jam and the disk wears oddly.
Clean out the bobbins with brake cleaner until they can rotate freely and then see how it is.
Thanks for the info will clean the bobbins out as I haven't done this thanks
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Quote from: cashst on June 12, 2016, 05:50:26 PM
Thanks for the info will clean the bobbins out as I haven't done this thanks
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I have a nut and bolt I tighten up and rotate while spraying with break cleaner, some people use an Allen key and put that is and rotate it it I prefer the nut and bolt method.
Alan
Quote from: cashst on June 12, 2016, 03:08:41 PM
Hi the bike is 2008 with only 11000 miles on the clock can't feel no vibration through the brake lever been told to try a new garage for a second opinion
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Hi and welcome.
Was this advisories or actual failures on the MOT?
Is it just the rear disc that failed or is there issues with front and rear?
Had the bike been parked for long periods? is there any disc corrosion or history of calliper seizures?
Was the MOT done at Sheldon Motorcycles?
If it's on the road and you can get to the Asda at SmallHeath, I work next door, on nights (1900 till 0700) Monday & Tuesday night if you want a second opinion?
Quote from: BigAlan on June 12, 2016, 06:30:28 PM
I have a nut and bolt I tighten up and rotate while spraying with break cleaner, some people use an Allen key and put that is and rotate it it I prefer the nut and bolt method.
Alan
Will try that Alan any idea on nut and bolt size thanks
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M10 Flange Bolt with a 20mm thread, and M10 Flange Nut... You will also need a 15mm spanner for removing the nut when you have done a bobbin.. :yes:
https://www.youtube.com/watch?v=1qoPqN2GBdw
This will work on 'stock' rotors, but certainly won't on EBCs....
What Debs says, makes life so much easier
Alan
Quote from: virginiajim on June 13, 2016, 01:10:44 PM
This will work on 'stock' rotors, but certainly won't on EBCs....
Why not? They all have bobbins. That the whole Idea isn't it?
Ah Grasshopper, the EBCs (at least on mine) don't have round bobbins. They have two flats I think, but definitely not moveable in the sense of like the Kwacker rotor or possibly other OEMs.
http://ebcbrakes.com/product/floating-mc-rotors/
Ok.. So I've watched this video about them..
https://www.youtube.com/watch?v=9ZxNSI4VVOY#t=17
The question I have is, How the hell do you clean them when they get gunged up with brake dust and other crap? Maybe I'm missing something here?
What is this clean you speak of? Never touched em personally. If someone knows of a way......? You could still spray stuff in but I'm not going to bugger them up by trying to turn them... Won't work, not prudent. You could ask EBC if you have them and want to clean them out.
Quote from: Debs on June 13, 2016, 10:56:28 AM
M10 Flange Bolt with a 20mm thread, and M10 Flange Nut... You will also need a 15mm spanner for removing the nut when you have done a bobbin.. :yes:
https://www.youtube.com/watch?v=1qoPqN2GBdw
Thanks Deb will do them the weekend
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