| Author | Message | ||
     Jc000 |
On my M2, whenever I move my bike when it's off I can hear what sounds like the front brake rotor scraping against the pads. Now I work on mountain bikes and I know that that kind of drag would not be acceptable. We would remove and straighten the rotor in that case. However, not sure if that's the case with a motorcycle. Is brake drag acceptable on a motorcycle? I've mentioned this multiple times to two different dealers and they seem to think it's fine. | ||
| Firemanjim |
A bit of drag is normal as long as you can easily push bike around. | ||
| Jc000 |
Thanks Jim, yes there is no problem pushing the bike. I thought that may be the case. My Cyclone's engine is a lot stronger than my mountain bike's! | ||
| Al_lighton |
Friction force=normal force * friction Coefficient. If no normal force, there is no friction force. Which is not to say there is NO normal force in what you've described. There might be a tiny bit. But probably not enough to worry about. When you release the brakes, there isn't any big spring pulling the pads back off the rotor. The pads essentially remain in light contact with the rotor in many cases, with only the springiness of the seals and the slight amount of disc runout to push the pistons back into their bores. If the seals are in decent shape, and there isn't a lot of gunk preventing their marginal retraction upon release of lever pressure, then there won't be a lot of friction from them. Al |
