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Grabbing brakes

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  • 11-09-2016 9:00pm
    #1
    aimnburn
    Registered Users Posts: 66 ✭✭


    Ultegra 6800 rear callipers with stock pads have started to grab. Not great on a fast descent when you have to stop quickly! Any advice for how to handle it or should I just change the pads? They've done a little over 2k but only look to be half worn.


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    #2
    endacl
    Registered Users Posts: 22,310 ✭✭✭✭endacl


    For around a tenner why not just change them? If that solves your problem then you've solved your problem for about a tenner. If it doesn't, put the old ones back on and try something else. And you'll have your next replacement set of pads lined up.


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    #3
    smacl
    Moderators, Society & Culture Moderators Posts: 15,754 Mod ✭✭✭✭smacl


    More likely the cables than the pads. Bit of crap between the inners and outers could mean the brake springs are a bit hindered when taking the pads off the rims hence the grab. Check your cables and clean or replace as necessary.


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    #4
    snottybridge
    Registered Users Posts: 106 ✭✭snottybridge


    Had the same problem myself recently,cable replacement was the solution for me.


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    #5
    aimnburn
    Registered Users Posts: 66 ✭✭aimnburn


    snottybridge wrote: »
    Had the same problem myself recently,cable replacement was the solution for me.

    Bugger. Wouldn't have expected to do that after only 2k. Internal cables are a right pain to change. Off to my LBS it is!

    Thanks for the advice.


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    #6
    ted1
    Registered Users Posts: 23,538 ✭✭✭✭ted1


    aimnburn wrote: »
    Bugger. Wouldn't have expected to do that after only 2k. Internal cables are a right pain to change. Off to my LBS it is!

    Thanks for the advice.

    What type bike is it? On cubes they are very easy to change


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    #7
    seamus
    Registered Users Posts: 68,317 ✭✭✭✭seamus


    Depends on the conditions too. I've had a recurring problem with my rear calipers where the gunge in the actual caliper stops it from springing back effectively. Every 5,000km or so I have to strip the whole thing down, clean it and grease it up to get the spring back in it.


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    #8
    07Lapierre
    Registered Users Posts: 8,248 ✭✭✭07Lapierre


    Which brake is grabbing? Front, rear or both?

    If its the front wheel, the problem could be the headset.


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    #9
    aimnburn
    Registered Users Posts: 66 ✭✭aimnburn


    Thanks lads.

    Its the rear brakes only. Bike is a Cannondale Synapse carbon with Mavic Aksium wheels. I had a look at the cables and calipers yesterday and they look fine and clean. I also clean the bike regularly, a good wash after every 2 or three rides and I rarely cycle in very wet weather. I also give the brake pivots a spray of wd40 around a wash.

    I'll try giving the rims a more thorough clean and a light sanding of the pads.


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    #10
    clog
    Registered Users Posts: 1,100 ✭✭✭clog


    It could be a rim or pad contamination issue, maybe some oil or other liquid is making them slide/grab.
    Have you also checked that the rim is true as the brake may be always 'grabbing' on the buckled spot.


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