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Weak Braking - Shimano 105
Since I exfoliated the more padded area of my anatomy on a stretch of
wet tarmac, my rear brake has been acting up. I have a full and unrestricted range of moment in the lever (Shimano 105) but seem unable to apply sufficient pressure to the brake. The brake mechanism (and pads) are fine. However, the shifter took a knock when I fell and scraped a bit along the road. Whilst it's scratched up a bit, there's no visible mechanical damage to the lever and I have no problems changing gear with it. Pulling the brake cable away from the top-tube puts a good amount of pressure on the brakes. However, using just the lever I just can't get enough pressure on the brakes to stop the bike. The problem must therefore lie somewhere in the lever, or in the cable around the lever. I'd be very grateful for any insight. I presume I must have damaged the gear lever, but it feels normal to use (apart from not stopping me properly!) |
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Weak Braking - Shimano 105
You have either stretched that cable, or it has slipped through the nut
at the actual brake. That's what I thought at first, but even with the cable very (i.e. too) tight, I can't get the brake to work properly. I should have said that in my post. The sensation is much like having an oily brake pad (I don't) - I'm gripping hard and getting a firm response from the lever, but it just doesn't stop the wheel from turning. Fortunately, I got away with little more than scratches, a slightly bent wheel and the dodgy brake. That's jolly lucky - my GPS was doing 40 when it hit the road and turned off! |
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Weak Braking - Shimano 105
wrote in message oups.com... You have either stretched that cable, or it has slipped through the nut at the actual brake. That's what I thought at first, but even with the cable very (i.e. too) tight, I can't get the brake to work properly. I should have said that in my post. The sensation is much like having an oily brake pad (I don't) - I'm gripping hard and getting a firm response from the lever, but it just doesn't stop the wheel from turning. Mine feel like that - I assumed my brake blocks are crap though and/or oily. Have you got crud in the outer tubes on the cable which is making it hard for the cable to slide? Or - perhaps due to a bump - has the outer tubing got a kink/sharp bend in it which the cable is struggling to pull around? -- peter Cheap train tickets database http://www.petereverett.co.uk/tickets/ Email sent to this address is generally deleted upon arrival Visit website if you want to contact me |
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Weak Braking - Shimano 105
Pete Biggs wrote:
wrote: Since I exfoliated the more padded area of my anatomy on a stretch of wet tarmac, my rear brake has been acting up. I have a full and unrestricted range of moment in the lever (Shimano 105) but seem unable to apply sufficient pressure to the brake. What happens when you pull the lever as hard as you can when not riding the bike? If you are not able to make the lever touch the handlebar, then there is nothing wrong its ability to transmit force from you to the brake. Not really a kink in the cable or something trapping it preventing full movement, maybe a broken strand. I'm no expert, but I'd take all the inner/outers off and check them. Then the toe of the brake to make sure it didn't get smacked and is out of line, lastly I'd take the lever apart. But I'm no expert. I might get someone else to have a go as well, just to verify. |
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Weak Braking - Shimano 105
Thanks for the all responses - they're very helpful.
I've already taken the bar tape off to inspect the exterior of the cables (no visible damage or kinks) but haven't had the insides out yet. I'll take a look tonight. Re. pulling the brake cable at the top tube, what that shows me is that the brake + pads are working okay. The lack of tension from the levers is dramatic - I can put all my weight on the left lever and still push the bike forward relatively easily, wheras pulling the cable by hand is much more effective. The lever itself appears to be working correctly - if I take all the pressure off the cable it has a full range of movement, and with the cable set correctly I can't pull the lever all the way back. However, it is very slightly spongier than I remember it being before. I'm beginning to think there must be an obstruction between the inner and outer cables at their front ends. That would make sense and be a lot cheaper to fix than a broken lever! Thanks again! |
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Weak Braking - Shimano 105
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