Author Front Brake calliper  (Read 462 times)

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  • Offline Mark91   hu

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    Offline Mark91

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    Front Brake calliper
    on: July 27, 2023, 10:13:52 am
    July 27, 2023, 10:13:52 am
    Hi All,

    I am writing to you, because I changed my front tyre, so I had to remove the brake callipers.
     Now my question would be, what is the tightening torque of the calliper bolts?

    I found 38 Nm on the internet, but given that the bottom of the fork is made from Alu and similar screw like to oil drain plug also tightened with 28 Nm, is this 38 Nm is right or really necessary (or for example 28 would be enough?), because in long term I would not like to damage the thread in the fork also.   

    Thank for any type of answer and have a nice season  :763: :763: :763:

    BR,
    Mark  :020: :020:

  • Offline Antares   gb

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    Offline Antares

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    Re: Front Brake calliper
    Reply #1 on: July 27, 2023, 10:26:06 am
    July 27, 2023, 10:26:06 am
    *Originally Posted by Mark91 [+]
    Hi All,

    I am writing to you, because I changed my front tyre, so I had to remove the brake callipers.
     Now my question would be, what is the tightening torque of the calliper bolts?

    I found 38 Nm on the internet, but given that the bottom of the fork is made from Alu and similar screw like to oil drain plug also tightened with 28 Nm, is this 38 Nm is right or really necessary (or for example 28 would be enough?), because in long term I would not like to damage the thread in the fork also.   

    Thank for any type of answer and have a nice season  :763: :763: :763:

    BR,
    Mark  :020: :020:

    It is 38Nm, that's correct.

    Absolutely no worries about damaging the thread, once, not paying enough attention instead of 40Nm I tightened the caliper bolts to 40 ft.lbs (54Nm) and was thinking "that's a little tighter than usual"

    No damage whatsoever as expected.

    You can safely go 10-20% above torque specs without causing damage, but obviously avoid if you can.

    Don't go lower though because then you loose tension in the bolt, which is what keeps it tight.

  • Offline Col_C   gb

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    Offline Col_C

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    Re: Front Brake calliper
    Reply #2 on: July 27, 2023, 11:08:01 am
    July 27, 2023, 11:08:01 am
    Over tightened axle pinch bolts is much more likely to cause damage!

  • Offline Antares   gb

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    Offline Antares

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    Re: Front Brake calliper
    Reply #3 on: July 27, 2023, 01:01:33 pm
    July 27, 2023, 01:01:33 pm
    *Originally Posted by Col_C [+]
    Over tightened axle pinch bolts is much more likely to cause damage!

    True but the thread have at least a 1.5x factor of safety. A little (key word being little) over is always safer than a little under, as bolt may not reach required tension to stay tight, especially on nuts and bolts without any thread locking solution.

     



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