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Problem with Chorus back brake(7 posts)

Problem with Chorus back braketoronto-rider
Oct 21, 2003 7:01 AM
I have a new Chorus equiped bike and after cleaning it this weekend noticed that the left caliper/pivot (if looking at the bike from behind the back wheel)only starts to press agains the wheel once the right caliper has touched the whell. On my front brake both calipers/pivots move at the same time towards the whell. I have centred the brake calipers buy turning the samll allen key on the brake. I am no machanic but thaught I would ask here before going to my LBS.
Thanks
wheel, not whell.NMtoronto-rider
Oct 21, 2003 7:04 AM
I'm probably wrong, but...PdxMark
Oct 21, 2003 7:36 AM
I think tht's the effect of the rear brake being just a single-pivot side-pull brake rather than a dual-pivot brake like in the front. Single pivot brake in the rear acknowledges that we don't need the monster death grip in the rear that dual-pivot brakes can provide... and so can save some weight with a single pivot brake. It's a feature, not a problem.
you're right at least....divve
Oct 21, 2003 9:51 AM
...in my case:) I was sort of puzzled myself but I think it's a result of their single pivot rear design. When I apply the rear brake relatively slowly the drive-side pad also touches the rim first. Only when I apply the brakes faster do they touch in sync.
re: Problem with Chorus back brakeflakey
Oct 21, 2003 8:59 AM
Here are a few things to check:
The bolt that holds the caliper on the frame is loose, and the cable housing pushes the caliper.
the mating surface between the the caliper and the frame is too smooth, which allows the caliper to move. (add serrated washer(s))
I would put the fine adjuster screw in the middle and then either you or your shop check those two items.
Thanks, I will try it.nmtoronto-rider
Oct 21, 2003 9:35 AM
You need a cone wrench and an allen key...Spunout
Oct 21, 2003 10:06 AM
re-center the brake with the mounting bolt loose. Hold it centred with a cone wrench (behind the arms, in front of the bridge) while you tighten it.

Fiddle with the little screw again, and re-do until everything strikes at the same time.