Author [NL] [FR] [ES] [DE] [SE] [IT] Topic: Rear Brake Pedal Pivot Bolt snapped, drilled out, now Heli-Coil?  (Read 7461 times)

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  • Offline jim515

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    Offline jim515

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    Rear Brake Pedal Pivot Bolt snapped, drilled out, now Heli-Coil?
    on: May 09, 2020, 11.12 pm
    May 09, 2020, 11.12 pm
    Recently I screwed up and did a no speed drop onto the riders right in my driveway. Outside of a couple scratches and bruised pride, the rear brake pivot bolt snapped. It was flush to the frame.

    I started with the left hand drill bit for the tap hole, and hoping it would back out the old bolt. No joy. Easy Out didn't get it out. After a bunch of time and getting no where I bit the bullet and drilled it out.

    Reading the thread about the pivot bolts for gear change lever and brake pedal and found the very nice specs and diagram for the bolt, (Thanks Coconut). The bolt length is not supposed to go through the plate, There is enough space behind it, if I had a long enough bolt, to connect it back there.

    Since that isn't the case, my question is has anyone put a heli-coil into that, or something similar to in the brake area?
    I have never had to use one before, so any shared experience is welcome.

    Drastic step is replace the frame section, which I don't want to do.
    DoD #3.2616
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  • Offline Coconut   gb

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    Re: Rear Brake Pedal Pivot Bolt snapped, drilled out, now Heli-Coil?
    Reply #1 on: May 09, 2020, 11.52 pm
    May 09, 2020, 11.52 pm
    You'd have to double check, but I believe the hole for the Brake Pedal
    is tapped all the way through the Frame, i.e. it is not a "Blind" Hole,
    and if so then theoretically you could fit a lock nut on a longer bolt
    that protruded through the frame.

    Another Member ( "Traxx") found that "Heli-Coils" were inferior
    to the "Time Sert"  type of thread repair insert.

    Here's a video explaining how to use Time-Serts:



    Cheers  :821:







  • Offline Traxx

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    Re: Rear Brake Pedal Pivot Bolt snapped, drilled out, now Heli-Coil?
    Reply #2 on: May 10, 2020, 08.31 am
    May 10, 2020, 08.31 am
    I found the time sert to be a much better solution.
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  • Offline digital   es

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    Re: Rear Brake Pedal Pivot Bolt snapped, drilled out, now Heli-Coil?
    Reply #3 on: May 10, 2020, 10.17 am
    May 10, 2020, 10.17 am
    The helical coil is best to put the original screw or screw of the same diameter. With a suitable coil, the screw fits perfectly.
    Only motorcyclists know why dogs stick their head out the car window.


  • Offline 1675   gb

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    Offline 1675

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    Re: Rear Brake Pedal Pivot Bolt snapped, drilled out, now Heli-Coil?
    Reply #4 on: May 10, 2020, 12.08 pm
    May 10, 2020, 12.08 pm
    The brake pedal hole is a "through" hole and the gear lever is a "blind" hole. If the original remains of the bolt are still in, have you tried gentle heat on it (a hot air gun should suffice). This should soften the Loctite and you may be able to get the threaded part out with an easi out, but careful not to break it, because then you are in deep trouble. Hot enough so you can just touch the area, but make sure you have shielded or moved anything such as cables etc to avoid damage. Time serts are best, but Helicoils are good too. There is no section of frame to replace, it IS the frame. Make sure you get the hole to accept the repair tapped square into the frame or the pedal will bind on assembly if you do take this route.

  • Offline jim515

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    Offline jim515

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    Re: Rear Brake Pedal Pivot Bolt snapped, drilled out, now Heli-Coil?
    Reply #5 on: May 10, 2020, 03.00 pm
    May 10, 2020, 03.00 pm
    A bit late for the heat idea. I cleared things out with a drill bit. 
    I was thinking that bit was a section of frame that could be replaced. Like I said, that is the drastic case. Long before I got there I would try some other methods. A more reasonable course of action, if it comes to that is, having the specs Coconut put up from the other thread, I could get a machine shop to make the part with a longer threaded shaft and just bolt it on if needed.

    I didn't know about Timesert, as having never ended up in this spot previously (surprising myself). I am going to give them a try.
    DoD #3.2616
    '13 Triumph Trophy
    When in doubt gas it, at least it ends the suspense.
    “If everything seems under control, you're not going fast enough.” Mario Andretti

  • Offline Peds8045

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    Re: Rear Brake Pedal Pivot Bolt snapped, drilled out, now Heli-Coil?
    Reply #6 on: May 11, 2020, 09.37 am
    May 11, 2020, 09.37 am
    Just looked at the price of Timeserts, not cheap due to special tools required.
    As an engineer in the UK defence industry, on most military vehicle tasks that required tapping into aluminium structures we relied on Keenserts. Normal drill bits and taps are used to prepare the hole before screwing in the Keensert and then driving the pins into the material. See link below. They are widely available in the UK, not sure about North America.   

    https://www.kvt-fastening.at/en/products/brands/keenserts/

  • Offline 1675   gb

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    Offline 1675

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    Re: Rear Brake Pedal Pivot Bolt snapped, drilled out, now Heli-Coil?
    Reply #7 on: May 11, 2020, 11.56 am
    May 11, 2020, 11.56 am
    M8 x 1.25 Keenserts are available on ebay for £12.99 for a pack of ten. You would also need and M12 x 1.25 tap and the correct drill to suit the tap. Listed on item No. 202981620687
    I have no connection with this company