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Recently (within the last 1500 miles) I have noticed my rear brake disc may be warped.
When riding at low speed (Below 10 mph), you can hear the disc/ calliper 'squeak', at the same point in each rotation of the wheel. (When the tyre valve is at the bottom of the rotation), and when riding VERY slowly, as in MOD 2, (Slipping the clutch, and constantly using rear brake), you can feel the bike almost 'lurching' forwards, every time the wheel rotates.
I would imagine it has been like that for some time, as the bike has gone through a set of rear pads in less than 4000 miles. You can also see a build-up of brake dust on a bit of the disc (the bit that should be in contact with the pads), which would suggest that this area does not get used, as it is 'bent'.
Also, when the bike is on my ABBA stand, I can place my finger so that half of my 'fingerprint area' is on the back of the pad, and the other half on the calliper mounting bracket. As I rotate the wheel, you can feel the pad moving in and out.
Firstly, I was wondering if this would affect the M.O.T, as the wheels need to rotate freely. The wheel still rotates fairly freely, but not as freely as when I compress the piston so that the pads are out the way of the disc.
Secondly, would this be covered under warranty from Yamaha? I am like the third or fourth owner of the bike, and it is a late 2009 model, with just over 5300 miles, but it must have been wrong for a long time, as like I say, it went through a set of pads in under 4000 miles, and I don't really use the rear brake that much/ heavily. I might phone up Yamaha and see what they say.
Finally, could it even be as bad as a bent wheel or something? (if it is, I will just put up with it! lol)
Benji, I'm sure you will be able to help me out here!
When riding at low speed (Below 10 mph), you can hear the disc/ calliper 'squeak', at the same point in each rotation of the wheel. (When the tyre valve is at the bottom of the rotation), and when riding VERY slowly, as in MOD 2, (Slipping the clutch, and constantly using rear brake), you can feel the bike almost 'lurching' forwards, every time the wheel rotates.
I would imagine it has been like that for some time, as the bike has gone through a set of rear pads in less than 4000 miles. You can also see a build-up of brake dust on a bit of the disc (the bit that should be in contact with the pads), which would suggest that this area does not get used, as it is 'bent'.
Also, when the bike is on my ABBA stand, I can place my finger so that half of my 'fingerprint area' is on the back of the pad, and the other half on the calliper mounting bracket. As I rotate the wheel, you can feel the pad moving in and out.
Firstly, I was wondering if this would affect the M.O.T, as the wheels need to rotate freely. The wheel still rotates fairly freely, but not as freely as when I compress the piston so that the pads are out the way of the disc.
Secondly, would this be covered under warranty from Yamaha? I am like the third or fourth owner of the bike, and it is a late 2009 model, with just over 5300 miles, but it must have been wrong for a long time, as like I say, it went through a set of pads in under 4000 miles, and I don't really use the rear brake that much/ heavily. I might phone up Yamaha and see what they say.
Finally, could it even be as bad as a bent wheel or something? (if it is, I will just put up with it! lol)
Benji, I'm sure you will be able to help me out here!
does sound like its warped though, think mine was too before i got my wavey rear disc 
