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  1. 01-31-2009 04:20 PM #1
    SLC_S4
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    Front caliper bolts

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    What size are the bolts? The only write up that I can find says 7mm hex, but that doesn't work. Anyone know for sure?
    -Seth

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  2. 01-31-2009 04:53 PM #2
    mholme
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    Re: Front caliper bolts

    Quote Originally Posted by SLC_S4 View Post
    What size are the bolts? The only write up that I can find says 7mm hex, but that doesn't work. Anyone know for sure?
    7mm? Did you mean 17mm? I've seen 18mm on some and 22mm on others.
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  3. 01-31-2009 07:07 PM #3
    SLC_S4
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    Re: Front caliper bolts

    Yeah, sorry, I meant 17mm, but that wasn't the right size. I found that mine are 21mm
    -Seth

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    APR Stage 3 - APR Stealth exhaust - APR downpipes - APR Bipipe - APR snub mount - AWE side mount intercoolers - AWE LWFW - RS4 clutch - ITG panel filter - JHM Shifter - Startup Racing Vogtland GT coilovers - Stern adjustable control arms - Fiber Images vented carbon fiber hood - Fiber Images carbon fiber fenders - Recaro Style Topline seats - A bunch of other stuff I can't remember
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  4. 01-31-2009 11:23 PM #4
    GQ//S4
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    Re: Front caliper bolts

    yeah they're 21mm's on the front, and then the small bolt holding on the brake lines is 13mm I think. The rear calipers require a 13 and 15 mm wrench, and a 7mm allen wrench (male end), if you want to take off the caliper bracket as well at least.

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  5. 02-01-2009 05:03 AM #5
    mholme
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    Re: Front caliper bolts

    So apparently the Audi parts bin was low stock on bolts during certain production runs..
    Mine are 18mm and I knew some were 22mm, and apparently 21mm..
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  6. 02-01-2009 03:44 PM #6
    Rapter
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    Re: Front caliper bolts

    Quote Originally Posted by mholme View Post
    So apparently the Audi parts bin was low stock on bolts during certain production runs..
    Mine are 18mm and I knew some were 22mm, and apparently 21mm..
    Maybe it goes by the build year because mine is a 2000 and it has 18mm also.
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  7. 02-01-2009 04:32 PM #7
    mholme
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    Re: Front caliper bolts

    Quote Originally Posted by Rapter View Post
    Maybe it goes by the build year because mine is a 2000 and it has 18mm also.
    Maybe, but knowing audi, there's probably no ryhme or reason to it..
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  8. 06-12-2013 06:21 AM #8
    sjmelling
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    So, I'm bringing this thread back from the dead. I had a caliper bolt back out last night at some point. Is the pitch of the threads all the same between the different bolt sizes. If so, what is it?
    Stephen J Melling
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  9. 06-12-2013 09:15 AM #9
    sjmelling
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    Anybody? I've got the 18mm bolt. Just trying to save some effort. Don't want to remove the caliper and take the bolt somewhere to match it up
    Stephen J Melling
    2001.5 Audi S4
    ~~Laser Red Stage 3, Rods, F21's, other stuff and things
    2000 Audi S4
    ~~Hibiscus Red, Silver Interior, 01E, stock AF
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  10. 06-12-2013 10:06 AM #10
    usmc.S4
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    Look em up on ECS. That's where I got mine.
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  12. 06-12-2013 10:10 AM #11
    Timtheguru
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    2001.5 And was an 18mm head, I think they are M14 bolts though...
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  13. 06-12-2013 11:18 AM #12
    usmc.S4
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    14x1.5x38 part number N90876802
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  14. 06-12-2013 11:24 AM #13
    sjmelling
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    Thanks man. I did end up looking on ECS and ordered 1. Was going to post back up if it fit correctly.
    Stephen J Melling
    2001.5 Audi S4
    ~~Laser Red Stage 3, Rods, F21's, other stuff and things
    2000 Audi S4
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  15. 06-15-2013 07:21 PM #14
    fshowcars
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    i also have a post on how to break them if frozen with sizes, i believe... i had a nightmare breaking the fronts free.
    Latest mod - JHM rebuild kit :swoll:
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  16. 06-15-2013 07:39 PM #15
    6speeds
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    Quote Originally Posted by fshowcars View Post
    i also have a post on how to break them if frozen with sizes, i believe... i had a nightmare breaking the fronts free.
    Liquid wrench, leverage, and a torch if needed.
    B5 S4 - Stage 2+ - Slow & Loud
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  17. 06-16-2013 08:36 AM #16
    usmc.S4
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    Soak in PB blaster and work on something else for an hour
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