Warped brake disc

[Beer Belly]

I've noticed some vibration from the front brakes when braking from higher speeds. I suspect one the front discs has warped slightly. The bike is just over 2 years old, low mileage circa 6000, never thrashed or abused. Head bearings properly adjusted, no wheel balance issues, never used in the winter sludge. Has anyone out there had any joy with a warranty claim for this problem? I've never encountered it on any my previous bikes.

[krisz75]

https://www.crosstourer.com/index.php/topic,1137.0.html

I had the same issue. No Warranty. Buy new discs!

[Beer Belly]

Do you get a 3 year warranty in Hungary as we do in the UK?

[krisz75]

Yes.

[Beer Belly]

I guess its worth a try at the dealers but it's annoying with such little usage.

[SunAndSea]

Highly unlikely the discs will be warped. Probable cause is:

a) Some pad material left on discs from holding brakes on when discs are hot. This will be hard to see but can be sanded off or removed by doing 2 or 3 very hard stops from speed

b) These are floating/semi floating discs. The mounts or 'bobbins' that the discs float on can easily get fouled by brake dust stopping the discs floating. These ca be cleaned with brake cleaner.

I very much doubt your discs are warped at all. It's a common problem on all bikes with floating discs (see point b above)

[Beer Belly]

Originally Posted by SunAndSea

Highly unlikely the discs will be warped. Probable cause is:

a) Some pad material left on discs from holding brakes on when discs are hot. This will be hard to see but can be sanded off or removed by doing 2 or 3 very hard stops from speed

b) These are floating/semi floating discs. The mounts or 'bobbins' that the discs float on can easily get fouled by brake dust stopping the discs floating. These ca be cleaned with brake cleaner.

I very much doubt your discs are warped at all. It's a common problem on all bikes with floating discs (see point b above)

Good idea, I'll double check the bobbins, very much doubt they will be seized but you never know, I'll also check the runout with my dial test guage when I get chance.

[SunAndSea]

You need to clean the bobbins with brake cleaner very thoroughly. I had this issue on my old ZZR1400 after only 9000kms. Dealer wanted to change the discs. I cleaned the bobbins and all was good. Same on my old CT.