Shimano roller brake problem
06-08-05, 06:08 AM
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Shimano roller brake problem
First of all, hi. This is my first post and - looking through the wealth of knowledge on this forum - certainly won't be my last.
I have a problem with the front roller brake on my Carrera Subway 8 town bike, which I've owned for a little under 10 months. When I apply too much pull, the brake 'gives' and suddenly becomes very loose and loses power entirely. It's happened a couple of times now, I've managed to fix it but I'm not sure how.
I have a basic understanding of how roller brakes work, and it seems to me the rollers are not pressed tightly enough against the rotating plate (with the grooves/teeth), allowing them to 'slip' to the next groove if I apply too much pull to the brake. I've pulled the brake cable further through the locking nut that holds it in place at the 'caliper arm' (you'll have to excuse my lack of technical terminology), giving the correct tension once more, but I'm not sure if I'll be able to keep doing this indefinitely.
My question is, how can I fix the root problem of the brakes 'slipping a cog'? The pressure I'm applying is certainly not excessive, and I'm rather worried that if it decides to give at an inopportune moment it could be pretty dangerous.
I have a problem with the front roller brake on my Carrera Subway 8 town bike, which I've owned for a little under 10 months. When I apply too much pull, the brake 'gives' and suddenly becomes very loose and loses power entirely. It's happened a couple of times now, I've managed to fix it but I'm not sure how.
I have a basic understanding of how roller brakes work, and it seems to me the rollers are not pressed tightly enough against the rotating plate (with the grooves/teeth), allowing them to 'slip' to the next groove if I apply too much pull to the brake. I've pulled the brake cable further through the locking nut that holds it in place at the 'caliper arm' (you'll have to excuse my lack of technical terminology), giving the correct tension once more, but I'm not sure if I'll be able to keep doing this indefinitely.
My question is, how can I fix the root problem of the brakes 'slipping a cog'? The pressure I'm applying is certainly not excessive, and I'm rather worried that if it decides to give at an inopportune moment it could be pretty dangerous.
06-08-05, 10:02 AM
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I've taken a picture of the brake and annotated it for easier explanation. Forgive the MS Paint work, I'm in the office and my tools are limited!
The moving 'carriage' component marked with the red arrow should be in the position marked by the blue line, or thereabouts (it travels around the central circular housing). AS you can see, it's now moved toward the right of the picture. Previously I've fixed this by pulling the brake cable, marked with the yellow arrow, down through the locking nut to restore the tension. I'm not sure if I can keep doing this though, it involves taking the wheel off and fiddling about to move the carriage (red arrow) back over to the left.
The moving 'carriage' component marked with the red arrow should be in the position marked by the blue line, or thereabouts (it travels around the central circular housing). AS you can see, it's now moved toward the right of the picture. Previously I've fixed this by pulling the brake cable, marked with the yellow arrow, down through the locking nut to restore the tension. I'm not sure if I can keep doing this though, it involves taking the wheel off and fiddling about to move the carriage (red arrow) back over to the left.
06-09-05, 01:32 AM
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Well, it turns out I was thinking about this way too much. After examining further I've come to the conclusion that it was a simple case of the locking nut holding the cable not being tight enough.
Hurrah for one-man threads!
Hurrah for one-man threads!
