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Post by hovis on Jul 18, 2007 12:12:59 GMT -5
Ok folks, about a week ago noticed my rear disc was quite warm after a run,thinking my rear caliper was binding i stripped in down cleaned everything,renewed seals and copper greased pins,new fluid put it all back together,quite pleased with myself went out for a run,came back,same problem  ,turns out my rear disc is warped. Now the bike only has a genuine 9000 miles on it,so how come it's warped so early  ??,i've read that the single sided shaft/arm can cause this to happen,but after only 9000 miles ?? Hovis |
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Post by everydaybiker on Jul 18, 2007 17:33:56 GMT -5
Are you sure it's warped? After that mileage I'd be surprised, although age is another independent factor.
Do you notice any uneven (pulsing) braking effect from back brake? If not, it may be fine. It's normal for discs to get warm after riding; unless it's very hot to the touch it's not usually a problem. Does the back wheel rotate relatively freely by hand before the bike is first ridden?
Having done the overhaul you mentioned, you've done worthwhile preventative maintenance to the caliper which is not wasted even if the disc is warped. If you still suspect the disc, you can do a quick visual check by holding a marker against the edge of the disc, then rotating the back wheel. See if the marker (e.g. a pencil) is displaced by the disc or a gap opens between it and the disc surface. If so, the next step is to get the disc checked with more accurate instruments to see if any warpage is within tolerances.
Let us know what you find.
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Post by hovis on Jul 19, 2007 14:07:06 GMT -5
Hello mate,
thanks for the advice,no uneven pulsing through the pedal,disc is hot to the touch after a ride,wheel rotates freely although you can hear the disc brushing against the brake pads during rotation although not constantly.
I think it must be the disc,will try the marker as you suggest tomorrow and report back
Cheers Hovis
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Post by tweaker on Jul 19, 2007 17:15:17 GMT -5
Hovis -
If I were you I'd leave it a handful of weeks after having overhauled your calipers before you do make a move on the discs front, especially as you don't get any uneven pulsing effects. In the past I've noticed the rear wheel "brushing" on rotation for a couple of weeks after servicing - frees up after that.
For this reason, I like to make sure I complete any brake maintenance about a month before I put my bikes in for the MOT.
All the best mate
- Tweaker
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Post by hovis on Jul 20, 2007 12:55:32 GMT -5
Tweaker mate,
funny you should say that,took the day off work today and went for a good run on the bike,the rear disc deffo did not feel as warm after the run,you may be right,i'll monitor it over the next few runs.
Cheers Hovis
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Post by mexicanbandit on Jul 23, 2007 3:19:56 GMT -5
It could depend on how you use the brakes. If you do alot of fast riding and are quite heavy on them the disc's will get hot, quite normal as they do work on friction after all, my bandit 1200 ones get stinking hot after a good days riding round matlock. If theres no vibration when their under load then it should be ok.
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Post by ntvnick on Jul 23, 2007 3:52:45 GMT -5
Just a thought if riding with thick boots on, make sure you are not resting your foot on the brake pedal. I know this seems obvious, but you never know.
cheers Nick
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Post by hovis on Jul 23, 2007 10:34:12 GMT -5
i felt it yesterday  (and the disc) and it seems to be cooler,maybe as tweaker said, There is no vibration so i'm hoping things are ok, and no Nick i'm not resting my foot on the brake pedal,although i know what you mean Thanks for the advice lads Hovis |
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,turns out my rear disc is warped.
??,i've read that the single sided shaft/arm can cause this to happen,but after only 9000 miles 
(and the disc) and it seems to be cooler,maybe as tweaker said,