The rear brake (calliper) on my road bike sticks. When I pull the brake it pulls down but only half springs back and there's then slack in the leavers. This is causing rubbing on the rim.

It's a fairly new bike (last year) so I wouldn't think it's just normal wear and tear. I've tried adjusting the tension using the adjuster and rebalancing but it doesn't seem to fix it.

Any idea what the problem is and how it can be fixed?

  • 1
    "half springs back" -- half as far as it used to, or only one side springs back? – darkcanuck Feb 7 '11 at 23:10
  • @darkcanuck - Should have been a bit more explicit, it was half springs back to it's original position. Not one sided – James Hay Feb 8 '11 at 14:42
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    Did you make sure to lube the brake cables? The LBS can help you with the appropriate lube -- not WD40! – RoboKaren Jun 20 '14 at 2:37

A few things off the top of my head:

  1. Not enough brake cable tension. This is very likely if it's fairly new and hasn't been tuned up -- brake cables stretch over time, especially when new. The amount of stretch can be more than the barrel adjuster can compensate for, so you would need to actually pull more cable through the cable clamp on the caliper.

  2. Broken (or worn out) caliper spring. Less likely, but you should be able to see if it's broken, depending on the model of brake. Your LBS might also be able to replace the spring rather than buying a whole new caliper.

  3. Frayed cable or housing causes cable to "catch" and not spring back. Might be harder to find, you'll need to inspect the cables and housing for damage (may need to pull the cable out completely). The good news is that these are relatively cheap & easy to replace.

  • Thanks. With a bit more fiddling I seemed to have fixed it with out having to do anything too drastic. Like I said wear and tear isn't an issue. To me it seems like the spring doesn't put enough pressure on the calliper for it to return to it's normal position. If it happens again it might need a trip down the lbs. Thanks again – James Hay Feb 8 '11 at 14:39

Lubricate everything, all moving parts of the calliper, inside the housing etc. Wipe excess off. Use a thin penetrating lubricant (tri-flo or similar, not WD40) Be very careful not to contaminate pads, rims or disc rotors though.

I once had a sticky cable disc brake calliper (BB7) which I thought had a weak spring. I was putting of the maintenance because I didn't want to get into the spring issue. Anyway I rode with a dragging brake for a long time. Then one day doing other maintenance I quickly oiled the calliper and it completely fixed the problem. An easy solution that I had put off for too long!

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