Rear brake not stable -- why?
10-25-19, 11:35 AM
#1
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Rear brake not stable -- why?
Mounted a new (to me) Chorus brake and for some reason there's some play allowing it to swing side to side. Can't understand why. Any ideas?
10-25-19, 11:49 AM
#2
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Looks like a single-pivot brake. That movement is normal.
The spring centers the brake pads. If you need to adjust the brake pad centering, you need to loosen the mounting nut and rotate the spring.
In the olden daysr days, when single-pivot side-pull brakes were very common, I would lightly tighten the mounting nut, then tap on the spring near its mounting point with a punch until the brake pads were centered, then I'd tighten up the mounting nut.
The spring centers the brake pads. If you need to adjust the brake pad centering, you need to loosen the mounting nut and rotate the spring.
In the olden daysr days, when single-pivot side-pull brakes were very common, I would lightly tighten the mounting nut, then tap on the spring near its mounting point with a punch until the brake pads were centered, then I'd tighten up the mounting nut.
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10-25-19, 11:49 AM
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Mounted a new (to me) Chorus brake and for some reason there's some play allowing it to swing side to side. Can't understand why. Any ideas?
https://youtu.be/rTvD5TYl0fk
https://youtu.be/rTvD5TYl0fk
10-25-19, 12:00 PM
#4
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But the front brake is completely anchored with no movement at all. I may be mistaken, but that would suggest to me that the rear brake should be the same. Shouldn't it?
Ah, the nut does seem to be a bit long, at least going by this photo.
Thing is, I thought the nut was the same length as on the previous Chorus brakeset. They're practically the same model and year brakeset, as far as I know. Will have to investigate further.
Thing is, I thought the nut was the same length as on the previous Chorus brakeset. They're practically the same model and year brakeset, as far as I know. Will have to investigate further.
10-25-19, 12:11 PM
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But check to see if the spring mount itself is rotating. It shouldn't do that. If that's the case, the mounting nut is not holding the brake tightly against the frame. You'll need to tighten that nut.
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10-25-19, 01:49 PM
#7
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Well, I put the shorter nut on the brake and no change: it still swings back and forth. The bolt itself isn't moving, just the two arms of the brake. I rode the bike last night and I guess I can live with it, but I'm curious if there's something wrong here.
10-25-19, 05:40 PM
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Did you forget to put on the serrated washer between the caliper and the frame? It would explain the movement and the extra long retaining nut.
It should not swing side to side like that.
John
It should not swing side to side like that.
John
