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Post by joriff on Jun 29, 2008 12:45:30 GMT
This might be normal, but the brakes drag a tiny bit when i spin the wheels, is it an easy fix? I'm thinking of overhauling the brakes soon anyway.
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Post by joriff on Jun 29, 2008 12:51:28 GMT
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Post by HRHpenfold on Jun 29, 2008 13:33:12 GMT
This might be normal, but the brakes drag a tiny bit when i spin the wheels, is it an easy fix? I'm thinking of overhauling the brakes soon anyway. its completely normal  |
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Post by amorti on Jun 29, 2008 13:48:29 GMT
This might be normal, but the brakes drag a tiny bit when i spin the wheels, is it an easy fix? I'm thinking of overhauling the brakes soon anyway. its completely normal Err, no it's not. Brakes are meant to let go when you release them. The dust seals on both my calipers can be seen from the outside, although the brake caliper body and pistons are very good. So I'd go with the review you've read. If it bothers you, replace the seals. If it's only light, not to worry. But it will get worse, and you will end up ultimately with a bound caliper which invariably leads to a warped disc. So that's the worst case. |
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Post by HRHpenfold on Jun 29, 2008 15:17:23 GMT
its completely normal Err, no it's not. Brakes are meant to let go when you release them. The dust seals on both my calipers can be seen from the outside, although the brake caliper body and pistons are very good. So I'd go with the review you've read. If it bothers you, replace the seals. If it's only light, not to worry. But it will get worse, and you will end up ultimately with a bound caliper which invariably leads to a warped disc. So that's the worst case. Err yes it is, the pistons are only retracted by the spring of the seals so at best will still touch the disk on the high spots, if you spin the wheel and it catches the disk but is still pretty much free, then this is normal and a caliper rebuild will do nothing, a binding caliper is a completly different kettle of fish, but a slight drag when spinning the wheel is normal, not being able to spin the wheel is not normal, maybe you need to read the question properly before commenting |
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Post by joriff on Jun 29, 2008 17:51:15 GMT
Yep it is so light that it doesnt stop the wheel at all, just a light skimming is how i'd describe it, thanks for your input both of you, i wont worry about it then unless it gets worse. The bike hasn't had a good run in a few weeks while i've been working on it.
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Post by CD on Jun 30, 2008 9:54:18 GMT
Pads lightly skimming the disc are perfectly normal. Why are you thinking of rebuilding/overhauling the brakes?
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Post by bobh on Jul 1, 2008 19:33:12 GMT
In my experience, the time to rebuild the calipers with new seals is if the pistons won't retract with thumb pressure, or at worst light leverage, when the time comes to fit new pads.
Alternatively, if you've decided to change the fluid because it's 3 + years old (and is looking a dark brown colour), it may be worth doing then because the water in the fluid may have started some corrosion in the seal grooves. Certainly raking out the seal grooves on a badly corroded caliper is the worst part of the job, so if you can catch it before it gets that bad, so much the better.
It also depends on how much winter riding you've done, as corrosion induced by salt can get into the outer (dust seal) groove and squeeze the seal, leading eventually to a seized piston. Regular cleaning of the pistons and re-coating with red grease can help to forestall this.
Bob
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Post by joriff on Jul 3, 2008 20:26:31 GMT
Looking through the history it looks like the fluid has never been changed. The manual also suggests replacing the brake hoses every four years so i thought it would be a good idea to bleed the brakes through at the same time and change the pads/seals etc. I did notice however that the screws on the master cylinder top are mashed, or at least they seem to be. Some wd40 might reveal their condition better.
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Post by amorti on Jul 3, 2008 22:40:59 GMT
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Post by darren on Jul 10, 2008 13:41:45 GMT
Err, no it's not. Brakes are meant to let go when you release them. The dust seals on both my calipers can be seen from the outside, although the brake caliper body and pistons are very good. So I'd go with the review you've read. If it bothers you, replace the seals. If it's only light, not to worry. But it will get worse, and you will end up ultimately with a bound caliper which invariably leads to a warped disc. So that's the worst case. Err yes it is, the pistons are only retracted by the spring of the seals so at best will still touch the disk on the high spots, if you spin the wheel and it catches the disk but is still pretty much free, then this is normal and a caliper rebuild will do nothing, a binding caliper is a completly different kettle of fish, but a slight drag when spinning the wheel is normal, not being able to spin the wheel is not normal, maybe you need to read the question properly before commenting what he said edit:(the Err yes it is bit) ;D off a car, but same principle auto.howstuffworks.com/disc-brake2.htm |
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Post by CD on Jul 24, 2008 17:45:38 GMT
I recently did my back brtake because it was getting a bit stiff to push the pads back. Flippin good job I did... One piston was a pig to get out, all of the seal grooves were clogging and there was all sorts of crud in the cylinders. It would have never lasted another winter. I had the caliper and all its brackets powder coated. Very nice.  But... Do get the caliper joint faces coated avoiding the sealing O ring slots (I didn't and some visible metal bits got missed. DONT get the wheel spindle hole coated in the brake carrier. The coating will stop the spindle from going in. Otherwise, £15 for a super posh looking rear caliper is pretty cool. |
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