|
|
Thread Tools | Display Modes |
#21
|
|||
|
|||
installin mah brakes
On Apr 19, 10:22 pm, Stephen Greenwood
wrote: On Apr 19, 9:21 pm, landotter wrote: Size up on the linkage cable How does sizing up the linkage (straddle) cable help eliminate squeal? I've never heard that suggested before. It changes the mechanical advantage for actuating the brake, but that's in a direction that's orthogonal to direction in which the pads move when they squeal. Changing the straddle cable is about the only thing I haven't tried on a front Avid Shorty 7 that I cannot de-squeal. I switched from stock to Kook Stop salmon pads, I've cleaned the rims, and I've tried a vast number of ever-so-slightly different toe-in adjustments. No luck. Cleaning the rims with a Brillo pad wedged between the brake pad and rim helps, but not completely, and only for a very short time. The rear brake is the same type and the rear rim is the same, but that one was fine on the initial adjustment. Because of that, and because I've been successfully adjusting other cantilever brakes since 1994, I figure there must be some intrinsic mechanical resonance in the fork/ brakes/pads/rim combination. That, and the squeal is a more pure tone compared to other squealing brakes I've heard. Anyway, I'd be interested to hear how it might help. Thanks, Stephen Greenwood Have you mic'ed the post O.D. @ a few different points to get an average and to see how much it varies, plus measure the I.D. of the brake bushing @ both ends & from different positions again to look for average & max variation. You could have an out of spec post or brake bushing. Although I don't know what the clearance tolerance Min/ Max should be. But excessive (whatever that is) can cause vibration. Many cantilever posts are replaceable w/ a simple Allen key. Perhaps Avid could tell you what the Min/ Max tolerance is, since they are reasonably easy to access, or at least they used to be. Good luck Jay |
Ads |
#22
|
|||
|
|||
installin mah brakes
On Apr 20, 10:25 am, Stephen Greenwood
wrote: On Apr 20, 10:10 am, landotter wrote: It won't do squat. But it should slightly lower the mechanical advantage and let ya at least remove the straddle cable w/o ****in' with the barrel adjusters. Right. I haven't run cantis in a few years since the low-profile stuff became popular--but they seem extraordinarily fussy to set up. In my sample size of one, they have been. Besides the shorter arms, the pads are different. They're thinner, and the mounting post is positioned asymmetrically, whereas the Ritchey/KoolStop pads I always used had the mounting post centered. Either of these could have something to do with it. With some of the Kool Stop asymmetrical pads, there is no need to set toe in. They have a sort of a curved shape relative to the flatness of the rim side. Just set them up w/ both the front & rear ends of the pad touching & the toe in is set. Their instructions on the package or maybe web site explain it better. Works for me. Jay |
#23
|
|||
|
|||
installin mah brakes
On Apr 20, 12:13*pm, wrote:
With some of the Kool Stop asymmetrical pads, there is no need to set toe in. They have a sort of a curved shape relative to the flatness of the rim side. Just set them up w/ both the front & rear ends of the pad touching & the toe in is set. Their instructions on the package or maybe web site explain it better. Works for me. Jay Yeah, the Kool Stop V-type cartidge pads come with a small nub on the leading edge for that purpose. I used it for my first attempt. It worked fine for the rear brake, but something's unusual about the combination of rim/pad/brake/fork I'm using. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Generic Brakes vs Dura-Ace 7700 brakes ? | RS | Techniques | 19 | June 10th 06 01:30 AM |
Might Dump Road Disc Brakes for Rim Brakes | mykal | Techniques | 24 | July 7th 05 05:48 PM |
'V' Brakes vs Mechanical Disc Brakes | Ian Brown | Mountain Biking | 14 | May 31st 04 08:09 PM |
change cantilever brakes to V brakes | David Wood | UK | 6 | November 24th 03 12:56 PM |
disc brakes on front, v-brakes on rear | Per Elmsäter | Mountain Biking | 24 | October 21st 03 10:42 PM |