| Title: | Bicycling |
| Notice: | Bicycling for Fun |
| Moderator: | JAMIN::WASSER |
| Created: | Mon Apr 14 1986 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 3214 |
| Total number of notes: | 31946 |
I have a Trek 830 mountain bike and.... I need help on adjusting/setup of the rear u-brake. I believe that I finally got all the pieces back inside the u brake ei spring and both metal parts that the spring sits between. I guess my question is just how you go about getting the spring tension set up so the brake wants to stay away from the rim. Please don't say take it to a shop. The last time, 2 years ago, they refused to show me how to do it. Supposely not enough work area for me to get back in. Any help will be appreciated. I can't seem to find any information in the library books.. thanks in advance. mike
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1793.1 | It's simple... | NANOOK::BRALEY | Ed Braley DTN 263-6085 | Wed Dec 05 1990 08:53 | 27 |
The U-Brake adjustment is really quite simple. There are no
spring anchors in the mounting bosses. Instead, the brake spring
tension is set by tightening the anchor bolts (10mm) with the caliper
arm angled away from the rim. Then, when the cable pulls the brake
into the wheel the caliper spring comes under load. So, the at-rest
position for the caliper arm is where-ever you have it when you
tighten that bolt.
Don't forget to adjust the brake pads so that the trailing edge
contacts the rim first. If you don't, the pads will have poor contact
with the rim when the u-brake and frame bosses flex under the braking
force load. (And a bottom mounted U-Brake flexes a lot!)
Rough diagram with exaggerated angles:
direction of wheel travel
|
V
| |
pad \\ | | // pad
\\| |//
| |
|rim|
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| 1793.2 | reply .1 "too simple" | PNO::STARKEY | Thu Dec 06 1990 13:15 | 3 | |
Thanks Ed, that was my problem. I was tightening the anchor bolts with
the pads next to the rim. Boy that was simple. Works ok now. Happy
riding again.
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