Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 01-27-09, 12:00 AM   #1
mesasone
Senior Member
Thread Starter
 
Join Date: Apr 2008
Location: Iowa City, IA
Bikes: 2008 Surly LHT, 2008 Trek 7.2fx
Posts: 433
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rear Cantilever calipers stuck!

So, as I was on my way into work today, I came to a stop light and pulled on my brake levers and found that my right brake had NO resistance in it. Yikes. As the light was red, I turned around to take a look and found that my brake cable had come unhooked. I tried connecting it again, but was difficult given my gloves and the limited time I had before the light turns green. Anyway, I just rode it to work and back home like this.

Now that I'm home, I've been able to take a closer look at my brakes, and it appears my rear calipers are stuck and won't spring back open. I can manually pull them into the open position, although it is somewhat difficult. Any suggestions on what to do? The brakes are the Tekro Onyx that come on the LHT complete.

I am going to take them apart and try to clean and lube them tomorrow morning, and see if that helps. I'm thinking that perhaps it's just all the grit from the winter riding conditions, but not really sure. Any words of wisdom before I start?
mesasone is offline   Reply With Quote
Old 01-27-09, 01:10 AM   #2
Mondoman
Senior Member
 
Join Date: Apr 2008
Location: A Latvian in Seattle
Bikes:
Posts: 1,020
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Perhaps some water got into the pivot mechanism and froze there? In any case, take apart only one side at a time, so you have an assembled side still in place for reference when you forget how it all goes back together. In particular, pay attention to which small hole the anchor end of the spring goes into. It wouldn't hurt to take a lot of digital photos at each step of the disassembly and assembly. Put plenty of grease on the outside of the braze-on post that the brake pivots around, and very lightly grease the mounting bolt to simplify removal next time.
Mondoman is offline   Reply With Quote
Old 01-27-09, 03:42 AM   #3
dabac
Senior Member
 
Join Date: Mar 2008
Bikes:
Posts: 5,421
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Quote:
Originally Posted by Mondoman View Post
Put plenty of grease on the outside of the braze-on post that the brake pivots around, and very lightly grease the mounting bolt to simplify removal next time.
Brake arms don't slide against the posts. There's a bushing(assembly) pressed into the brake arm, and it's around this that the movement occurs. The bushing gets pinched into place by the mounting bolt and doesn't move in relation to the post.
A dab of grease will protect against corrosion and make removal easier though.
dabac is online now   Reply With Quote
Old 01-27-09, 03:51 AM   #4
Sixty Fiver
Bicycle Repair Man !!!
 
Sixty Fiver's Avatar
 
Join Date: Sep 2007
Location: YEG
Bikes: See my sig...
Posts: 27,262
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
It sounds like a lubrication issue... I see a lot of this here in the winteras the road crud and moisture can really bugger up one's brakes.

Disassebly and lubrication will usually cure this and while you are at it it would hurt to clean and lube your cable housings which may also be contaminated with water / dirt.
Sixty Fiver is offline   Reply With Quote
Old 01-27-09, 01:50 PM   #5
Mr. Underbridge
Senior Member
 
Join Date: Mar 2007
Location: Reston, VA
Bikes: 2003 Giant OCR2
Posts: 2,369
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You haven't worn a lip on the bottom of your brake pad, have you? Sometimes those can latch onto the rim pretty good.
Mr. Underbridge is offline   Reply With Quote
Old 01-27-09, 03:14 PM   #6
Mondoman
Senior Member
 
Join Date: Apr 2008
Location: A Latvian in Seattle
Bikes:
Posts: 1,020
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
dab, sorry, I should have been more precise in my wording -- thanks!
Mondoman is offline   Reply With Quote
Old 01-27-09, 03:15 PM   #7
mesasone
Senior Member
Thread Starter
 
Join Date: Apr 2008
Location: Iowa City, IA
Bikes: 2008 Surly LHT, 2008 Trek 7.2fx
Posts: 433
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
They became "unstuck" as soon as I loosened the bolt a bit. Anyway, I pulled the calipers off, clean them up a bit and lubed them, they are opening/closing great now. Didn't get a chance to do anything with the cables due to time constraints, but I appreciate the suggestion... I might take a look at it this week end.

Thanks for the input guys.
mesasone is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 11:22 PM.