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Hydraulic disk brakes – seized screw/pad axle

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  • January 28, 2019 at 11:32 am #29323
    DoctorFish

    Hello,

    I thought it was time I checked the pads on my disk brakes (they are Shimano BR785).  The front one is fine, but I cannot undo the retaining screw on the back one.  there is a small clip, and then a slot head screw, which I believe is called the pad axle.  It is completely seized and I am in danger (if not already done so) of damaging the head.

    Any ideas on how to get it out?

    It is like this, only with a slot head:

    https://www.wiggle.co.uk/shimano-br-m785-pad-axle-snap-ring

     

     

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  • January 28, 2019 at 1:58 pm #934925
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    PRSboy

    Use proper penetrating oil…

    Use proper penetrating oil… like plusgas, not normal WD40 (though they do a very good penetrating oil)

    Cut a new slot in the head and try again.  Maybe apply a bit of heat beforehand.

    Another option… have you enough space at the other end to grip with the molegrips without damaging the caliper?

    Otherwise, it will need drilling out.

    January 28, 2019 at 1:37 pm #934923
    0
    DoctorFish

    I tried with the mole grips,

    I tried with the mole grips, but they just smashed the head of the screw off!

    January 28, 2019 at 11:47 am #934921
    0
    StraelGuy

    All you can really do is soak

    All you can really do is soak the pin with penetrating fluid and try a set of mole grips on the head. Careful with the penetrating fluid or you’ll sacrifice the pads.

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