|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Why do my cantilever brakes do this?
Hi all:
My Surly Long Haul Trucker is the first bike I've owned with cantilever brakes so maybe I'm missing something here. Just about every time I release the brake straddle wire to move the brakes out of the way for wheel removal the two pads don't come back into position on either side of the wheel when I put the straddle wire back into place. Most of the time I have to tweak the spring force on one or the other cantilevers to get the two pads to come back into a balanced position "at rest." They've acted this way since day one after I put the bike together a little over a year ago and this funky action continues to this day. When I put the bike together I greased the posts the cantilevers ride on properly - I think - and it seems like if lubrication was an issue here that the brakes wouldn't come back centered at rest in normal operation, but they do, after I do my tweaks. I don't know why undoing the straddle wire and then reattaching it changes things, but it sure does. Any thoughts on what's causing this behavior? Brakes are TekTro 992A canti's attached to TekTro 100A levers. TIA. Tom Young |
Ads |
#2
|
|||
|
|||
Why do my cantilever brakes do this?
On May 2, 10:50 am, TomYoung wrote:
Hi all: My Surly Long Haul Trucker is the first bike I've owned with cantilever brakes so maybe I'm missing something here. Just about every time I release the brake straddle wire to move the brakes out of the way for wheel removal the two pads don't come back into position on either side of the wheel when I put the straddle wire back into place. Most of the time I have to tweak the spring force on one or the other cantilevers to get the two pads to come back into a balanced position "at rest." Obvious check: see that you're seating the wheel in the fork the same way each time with the QR on the same side. If you haven't done the rear brake straddle wire try releasing and attaching it and see if the same phenomena happens. Make sure to squeeze the lever after reattaching so the springs do their job centering. It's also worth cleaning the posts well and regreasing. I've had some nasty factory residue on canti studs. |
#3
|
|||
|
|||
Why do my cantilever brakes do this?
On Fri, 2 May 2008 08:50:00 -0700 (PDT), TomYoung wrote:
Hi all: My Surly Long Haul Trucker is the first bike I've owned with cantilever brakes so maybe I'm missing something here. Just about every time I release the brake straddle wire to move the brakes out of the way for wheel removal the two pads don't come back into position on either side of the wheel when I put the straddle wire back into place. Most of the time I have to tweak the spring force on one or the other cantilevers to get the two pads to come back into a balanced position "at rest." They've acted this way since day one after I put the bike together a little over a year ago and this funky action continues to this day. When I put the bike together I greased the posts the cantilevers ride on properly - I think - and it seems like if lubrication was an issue here that the brakes wouldn't come back centered at rest in normal operation, but they do, after I do my tweaks. I don't know why undoing the straddle wire and then reattaching it changes things, but it sure does. Any thoughts on what's causing this behavior? Brakes are TekTro 992A canti's attached to TekTro 100A levers. TIA. Tom Young Perhaps you are placing the wire off-centre in the hook. What happens if you leave them uncentred after re-attaching the wire, then squeeze the brakes, then release them? |
#4
|
|||
|
|||
Why do my cantilever brakes do this?
On May 2, 11:14 am, _
wrote: Perhaps you are placing the wire off-centre in the hook. Oryx brakes use a link wire, not a traditional hook: http://www.lickbike.com/productpage.aspx?PART_NUM_SUB='1255-00' |
#5
|
|||
|
|||
Why do my cantilever brakes do this?
On May 2, 9:05 am, landotter wrote:
On May 2, 10:50 am, TomYoung wrote: Hi all: My Surly Long Haul Trucker is the first bike I've owned with cantilever brakes so maybe I'm missing something here. Just about every time I release the brake straddle wire to move the brakes out of the way for wheel removal the two pads don't come back into position on either side of the wheel when I put the straddle wire back into place. Most of the time I have to tweak the spring force on one or the other cantilevers to get the two pads to come back into a balanced position "at rest." Obvious check: see that you're seating the wheel in the fork the same way each time with the QR on the same side. If you haven't done the rear brake straddle wire try releasing and attaching it and see if the same phenomena happens. Make sure to squeeze the lever after reattaching so the springs do their job centering. It's also worth cleaning the posts well and regreasing. I've had some nasty factory residue on canti studs. Yep, always put the front wheel in the same way and the problem exists front and back. I do "the squeeze" after putting things back together and that's what reveals the unbalanced situation. I probably will pull things apart for a relube. Thanks. |
#6
|
|||
|
|||
Why do my cantilever brakes do this?
On May 2, 11:51 am, TomYoung wrote:
On May 2, 9:05 am, landotter wrote: On May 2, 10:50 am, TomYoung wrote: Hi all: My Surly Long Haul Trucker is the first bike I've owned with cantilever brakes so maybe I'm missing something here. Just about every time I release the brake straddle wire to move the brakes out of the way for wheel removal the two pads don't come back into position on either side of the wheel when I put the straddle wire back into place. Most of the time I have to tweak the spring force on one or the other cantilevers to get the two pads to come back into a balanced position "at rest." Obvious check: see that you're seating the wheel in the fork the same way each time with the QR on the same side. If you haven't done the rear brake straddle wire try releasing and attaching it and see if the same phenomena happens. Make sure to squeeze the lever after reattaching so the springs do their job centering. It's also worth cleaning the posts well and regreasing. I've had some nasty factory residue on canti studs. Yep, always put the front wheel in the same way and the problem exists front and back. I do "the squeeze" after putting things back together and that's what reveals the unbalanced situation. I probably will pull things apart for a relube. Yup, do that--then set your springs both at max tension, and center them this time by releasing tension on one side or the other--this will also give you a nice feel at the lever. |
#7
|
|||
|
|||
Why do my cantilever brakes do this?
On May 2, 9:21 am, landotter wrote:
On May 2, 11:14 am, _ wrote: Perhaps you are placing the wire off-centre in the hook. Oryx brakes use a link wire, not a traditional hook: http://www.lickbike.com/productpage.aspx?PART_NUM_SUB='1255-00' Ah, maybe this *is* the source of the problem! The TekTro's do use a link wire, but the button on the link wire has two slots for the main brake cable to ride ride in: one slot allows the cable to move freely through the button and the other slot locks the cable in place. Perhaps when I release the free end of the link wire I'm inadvertently moving the main cable over to the "free movement" slot, where it moves from its original position, but the act of re-attaching the link wire is putting the main cable over in the "locked" slot, where it's off- center! I don't think I've ever focused on this possibility when I've removed and then re-attached the link wire; I think that I've always just assumed - without looking - that the main cable stays in the "locked" position. I'll test this hypothesis this evening. I have a feeling the two of you have solved the problem! Thanks. |
#8
|
|||
|
|||
Why do my cantilever brakes do this?
On May 2, 12:02 pm, TomYoung wrote:
On May 2, 9:21 am, landotter wrote: On May 2, 11:14 am, _ wrote: Perhaps you are placing the wire off-centre in the hook. Oryx brakes use a link wire, not a traditional hook: http://www.lickbike.com/productpage.aspx?PART_NUM_SUB='1255-00' Ah, maybe this *is* the source of the problem! The TekTro's do use a link wire, but the button on the link wire has two slots for the main brake cable to ride ride in: one slot allows the cable to move freely through the button and the other slot locks the cable in place. Perhaps when I release the free end of the link wire I'm inadvertently moving the main cable over to the "free movement" slot, where it moves from its original position, but the act of re-attaching the link wire is putting the main cable over in the "locked" slot, where it's off- center! I don't think I've ever focused on this possibility when I've removed and then re-attached the link wire; I think that I've always just assumed - without looking - that the main cable stays in the "locked" position. I'll test this hypothesis this evening. I have a feeling the two of you have solved the problem! Woohoo, a buncha monkeys just typed Othello! I do recommend the spring tension thing anyway--I really like the feel of a snappy lever. |
#9
|
|||
|
|||
Why do my cantilever brakes do this?
Does the straddle anchor hav a pully, or just a guideway?
if it's the latter, you're probably not replacing it at exactly the same spot on the straddle cable each time. Not unusual, but it can be irritating. Try this, next time you rehitch it, if it isn't centered, try moving the anchor slightly to wards the side that is furthest from the rim until it does, then give the brake lever a squeee and see if it stays centered. - - Compliments of: "Your Friendly Neighborhood Wheelman" If you want to E-mail me use: ChrisZCorner "at" webtv "dot" net My website: http://geocities.com/czcorner |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
WTB: Cantilever brakes. | Greg Achtem | Marketplace | 2 | May 21st 06 03:09 AM |
WTB: XTR Cantilever Brakes | Chad G | Marketplace | 0 | December 15th 04 02:29 PM |
wtb: Cantilever brakes or Cenerpull brakes | Jeremy | Marketplace | 1 | November 16th 04 06:07 AM |
STI and Cantilever Brakes | LDB | Techniques | 7 | August 8th 04 12:19 AM |
change cantilever brakes to V brakes | David Wood | UK | 6 | November 24th 03 12:56 PM |