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  1. #1
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    Help! My front hydraulic disc brake lever throw is greatly reduced on brand new bike.

    I have a brand new bike outfitted with Shimano SLX M666 brakes. I took the front wheel off in order to take the bike and do some light riding with a friend. Now when I attempt to actuate the front brake, the throw on the brake handle is significantly reduced. It is to the point that there is only minor progression in brake application (basically its either brakes on/ or off with very little in between).

    What I think happened is that the front brake inadvertently got applied while the front wheel was off. Could this have caused the problem?

    Will the brakes need to be bleed again to resolve this problem or can it be solved by taking out the wheel, pads and using a any special tool to reset the calipers in the correct position? I'm really upset as I would like to avoid at all costs bleeding the brakes as they were pre-bled from the factory.

    Any comments would be appreciated!

  2. #2
    coprolite fietsbob's Avatar
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    did you put the 'keeper' in when you removed the wheel?

    the auto pad wear adjust kicks in with the wheel out and nothing but air between the pads
    and you touch the lever.

    the Bike shop will help bail you out.,
    though reading the brake's owners manual does no harm.

    in the future, always put the keeper in whenever you remove the wheel.
    Last edited by fietsbob; 11-20-11 at 12:40 PM.

  3. #3
    Senior Member
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    push pistons back in the caliper. use a tire lever and pry or end of a cone wrench. the newer pistons are ceramic so they can crack. i like to go behind the backing of the opposite pad to push in the piston

  4. #4
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    thanks guys

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