2013 Prius, Bolt pinning parking brake broke? Help

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by N H, May 27, 2024.

  1. N H

    N H Junior Member

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    I was repairing the rear brakes on my 2013 Prius but the 14mm bolt that locks down the parking brake (like holds it still) snapped right off.
    Does anyone know the part number to get the replacement? Is there any good way to get the pin out of there? Like half of the bolt is stuck in there.
     
    #1 N H, May 27, 2024
  2. bisco

    bisco cookie crumbler

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    #2 bisco, May 27, 2024
  3. Georgina Rudkus

    Georgina Rudkus Senior Member

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    A photo? If it's a 14mm hex, the bolt is an M10x1.25 J.I.S. flange pattern.
     
    #3 Georgina Rudkus, May 27, 2024
  4. N H

    N H Junior Member

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    It's this bolt. I would drill it out but it has a bolt at the other end of it and I am not sure what to do.
     

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    #4 N H, May 29, 2024
  5. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Just as I thought, it's an M10x1.25 J.I.S. flange bolt.

    All you need to do is to extract the broken piece by drilling it out, use penetrating oil and extract it.

    Them you need to chase the threads out in the hole with an M10.1.25 tap.

    Both pieces of the bolt will tell you how long the replacement will need to be.
     
    #5 Georgina Rudkus, May 29, 2024
  6. N H

    N H Junior Member

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    okay, thanks a bunch
     
    #6 N H, May 30, 2024
  7. Mendel Leisk

    Mendel Leisk Senior Member

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    In the States McMaster Carr is a good source. Local hardware stores also stock metric bolts, which may or may not be physically compatible, things like thread pitch for example. Grade may be off, so depends how critical the application.
     
    #7 Mendel Leisk, May 30, 2024
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  8. Georgina Rudkus

    Georgina Rudkus Senior Member

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    You want ISO 10.9 grade J.I.S. flange bolts.
     
    #8 Georgina Rudkus, May 30, 2024
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  9. N H

    N H Junior Member

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    Oh okay, yea I went to autozone and they just have so many but at least most of them at 10.9 grade which seems to be the equivalent of metric 8 grading.

    I think the specific flange bolt is M6 though for this because it measures out to be 5.3mm
     
    #9 N H, May 30, 2024
  10. Georgina Rudkus

    Georgina Rudkus Senior Member

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    8.8 is mild carbon utility grade used in chassis sheet metal fasteners.

    10.9 is internal engine parts grade and a lot stronger.

    a search on Amazon for, "10.9 JIS flange bolt." They are readily available.
     
    #10 Georgina Rudkus, May 30, 2024
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  11. N H

    N H Junior Member

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    There was a bolt from the brake caliper that is metric grade 8 (not 8.8). That is equivalent to 10.9 no?
     
    #11 N H, May 30, 2024
  12. Georgina Rudkus

    Georgina Rudkus Senior Member

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    8 or 9 is a common OEM designation for ISO 8.8 grade.

    10 or 11 is a common OEM designation for ISO 10.9 grade.

    Even if OEM uses a bolt number 8, a 10.9 bolt is a stronger replacement that might not have snapped.
     
    #12 Georgina Rudkus, May 30, 2024
    Last edited: May 31, 2024
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  13. N H

    N H Junior Member

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    Ahh okay, thanks for the clarification
     
    #13 N H, May 31, 2024
  14. Mendel Leisk

    Mendel Leisk Senior Member

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    Food for thought:

    Regardless of the original bolt grade, it’s a hold-down bolt for a cable stay. It’s a “relatively” important cable stay, but just for the parking brake.
     
    #14 Mendel Leisk, May 31, 2024
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