Half of rear disc rubbing

[Bassmatt]

I have my rear wheel raised at the moment and have noticed when I spin it that for approximately half a turn I can hear the brake disc rubbing on the pads, the other half the wheel spins freely.
I cant think of any way the disc could have been bent (not ruling it out tho) , the wheel alignment is good.
Ideas?

[onearmedbandit]

Surely if anything other than the disc being bent was at fault it would rub the entire time?

[Akzle]

a) jiggle shit.
b) what does the DTI read?

[Blackbird]

I have my rear wheel raised at the moment and have noticed when I spin it that for approximately half a turn I can hear the brake disc rubbing on the pads, the other half the wheel spins freely.
I cant think of any way the disc could have been bent (not ruling it out tho) , the wheel alignment is good.
Ideas?

Same bike and mine does it too. Only does it when I've parked it up then left it for a while and everything is cold . I'm assuming that the pads move back when the wheel turns a bit faster because of the semi-floating rear caliper. If you come in from a run and lift the back wheel to lube the chain, there's no sign of it. Don't believe that it's an issue.

Cheers,

Geoff

[Bassmatt]

Surely if anything other than the disc being bent was at fault it would rub the entire time?

Was thinking the same, hoping for something else.


a) jiggle shit.
b) what does the DTI read?

a) that's the wifes area
b)9.1 so ok.


Same bike and mine does it too. Only does it when I've parked it up then left it for a while and everything is cold . I'm assuming that the pads move back when the wheel turns a bit faster because of the semi-floating rear caliper. If you come in from a run and lift the back wheel to lube the chain, there's no sign of it. Don't believe that it's an issue.

Cheers,

Geoff
Interesting, might go for a blast and see if it stops doing it.

Cheers.

[Blackbird]

Was thinking the same, hoping for something else.



a) that's the wifes area
b)9.1 so ok.


Interesting, might go for a blast and see if it stops doing it.

Cheers.

It's not as enjoyable as going for a run but stick your bike in gear on your stand and run it up for a minute then try it! Actually had mine on the stand this morning to give it a wash ready for a run tomorrow and it did exactly what you describe. Does it every time when cold. there's no uneven wear pattern on the disc or blueing so assume what I described about the floating caliper is a likely reason.

[Akzle]

Was thinking the same, hoping for something else.



a) that's the wifes area
b)9.1 so ok.


Interesting, might go for a blast and see if it stops doing it.

Cheers.

9.1??? or .91?

what the actual fuck

[Bassmatt]

9.1??? or .91?

what the actual fuck

:laugh:
I never know when you're serious mate, what's DTI?

[FJRider]

I cant think of any way the disc could have been bent (not ruling it out tho) , the wheel alignment is good.
Ideas?

If the disc was warm and got splashed by a puddle, it may warp. Even just a little.

There are ways to check the amount or warp ... and to see/check if it's uneven wear on the disc. Do nothing and you will have contact/wear on the disc pad on every rotation of the wheel. Check caliper alignment as well. And check rear wheel bearings.

The idea of ignoring the issue in the hope it will go away ... could be costly later. But it your bike and your neck on the line (possibly) ... but if you're sure nothing could possibly go wrong ... :sunny:

[Akzle]

:laugh:
I never know when you're serious mate, what's DTI?

fucked if i know i just make shit up. GOTCHA!! (http://lmgtfy.com/?q=using+DTI+to+measure+brake+discs)

[mossy1200]

Could be a rivet stuck if its a full floater.

[Drew]

No matter the brand or cost, brake disks aren't completely 'true'. Brake pads run on or fucken close to the disk all the time.

So when ya spin a wheel it is not uncommon to hear an uneven rub.

If you cant feel it pulse when applying the brakes, pay it never mind.

[Blackbird]

No matter the brand or cost, brake disks aren't completely 'true'. Brake pads run on or fucken close to the disk all the time.

So when ya spin a wheel it is not uncommon to hear an uneven rub.

If you cant feel it pulse when applying the brakes, pay it never mind.

Absolutely! Floating calipers take care of slight warping or misalignment.

[AllanB]

No matter the brand or cost, brake disks aren't completely 'true'. Brake pads run on or fucken close to the disk all the time.

So when ya spin a wheel it is not uncommon to hear an uneven rub.

If you cant feel it pulse when applying the brakes, pay it never mind.

What he said - sould like a fairly normal bit of pad rub. If it was a damaged disk you'd notice it when braking.