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Thread: Can i use a Non-M3 caliper for 2ndary caliper setup on an M3 rear?

  1. #1
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    Can i use a Non-M3 caliper for 2ndary caliper setup on an M3 rear?

    as the title states. i posted this in the regular E36 section and got no helpful answers. i have a full E36 M3 rear subframe. Hubs/Brakes/Axles, EVERYTHING. I also have a spare set of Non-M calipers. Can i use the Non-M calipers for a secondary ebrake on the M3 brake/hub/trailing arm setup? while i have it out i was planning on building up the subframe and then pulling my old one and stabbing this in. im not sure on how these things work and what makes them not work as far as technical stuff, so i figured id ask here. planned on using those weld on tabs from SRS concepts.

  2. #2
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    CAN you? Yes. Will it work? Probably not well enough for it to be reliable. The factory caliper is designed to slow the car down. Not stop the wheel from spinning. You can massively under size your master to get more force into the caliper but then you'll have a mushy long throw handbrake.

    Get some wilwoods. I don't even like the M3 rear calipers for this job.

    Status: Someone put glitter in my oil. Wait. Why's all my oil outside the engine? What's that knocking?

  3. #3
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    san Antonio? you going to the event on sunday at the drag strip? i need local bmw buddies.


    IG: dimitriantoniou

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    Quote Originally Posted by e30 394 View Post
    san Antonio? you going to the event on sunday at the drag strip? i need local bmw buddies.
    i wont be there this Sunday as i made plans to help my gf's mom move into her new house. i will be at the Drift Clinic with Chelsea Denofa tomorrow night though. I havent been to many events since Octobers Lone Star Bash as i burned through all of my tires that weekend. currently taking time to get $$ right and finish up projects.

    Look up San Antonio Drift on facebook. there is also a Lost In The Sauce event on Dec 31st. If you join the SA Drift facebook page, make a wlecome post and ill see it and add you to the Local BMW Retro group. Most of the E36s in the group are drifters and we have a lot of knowledge and parts to be had.

    - - - Updated - - -

    Quote Originally Posted by protomor View Post
    CAN you? Yes. Will it work? Probably not well enough for it to be reliable. The factory caliper is designed to slow the car down. Not stop the wheel from spinning. You can massively under size your master to get more force into the caliper but then you'll have a mushy long throw handbrake.

    Get some wilwoods. I don't even like the M3 rear calipers for this job.
    i was wondering about that. and i legit just remembered i have a buddy who has an old set of wilwoods kicking around. they are an old series that i think the new dynalites repalced, but im sure they are still good and serviceable.

  5. #5
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    Non-M e36 calipers are designed for 10mm thick rotors. Good luck having them fit a 20mm thick e36 M3 rotor. ;-)
    Also, these calipers have so much play that you will very soon feel it in your inboard brake lever.
    1969 2002 racecar + 1989 e30 M3 racecar


  6. #6
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    Quote Originally Posted by Massive Lee View Post
    Non-M e36 calipers are designed for 10mm thick rotors. Good luck having them fit a 20mm thick e36 M3 rotor. ;-)
    Also, these calipers have so much play that you will very soon feel it in your inboard brake lever.
    this is the techinical answer i was looking for.


    lemme ask you a question. Since ill be building my own mounting system with a weld on bracket, is there a cheaper caliper alternative to the Wilwood 120-9703 caliper that you recommend to use with your bolt on bracket? $175ish per caliper hurts.

  7. #7
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    In regard of fitting an e36 non-M caliper on an M3 rotor, well, everything can be fitted. But bow much mods are you willing to perform? You may hav to use almost worn out pads (thinner) to make-up for the increased rotor width. You may have to grind the carrier to allow for the thicker rotor.

    As for a replacement caliper, check if the forged Dynalite has the same mounting specs from Wilwood's website. Caliper is $40 cheaper

    http://wilwood.com/Calipers/CaliperP...temno=120-6806

    $125 on eBay -https://www.ebay.com/itm/Wilwood-120-6806-Brake-Caliper-Dynalite-Aluminum-Black-4-Piston/271868194826?epid=1741142841&hash=item3f4c9b700a:g :sqkAAOSwpDdVUiRv&vxp=mtr

    Last edited by Massive Lee; 12-16-2017 at 12:45 PM.
    1969 2002 racecar + 1989 e30 M3 racecar


  8. #8
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    BTW I confirm that both calipers are fully interchangeable as they share the same offset (24,9mm) and mount height (52.6mm).
    1969 2002 racecar + 1989 e30 M3 racecar


  9. #9
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    Quote Originally Posted by Massive Lee View Post
    BTW I confirm that both calipers are fully interchangeable as they share the same offset (24,9mm) and mount height (52.6mm).
    cool thank you. i was looking at the spec sheets on wilwood site and they look like the exact same specs.

  10. #10
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    If you look at thread that was started by a member years ago and that depicted how I came into designing the hydraulic handbrake brackets, you will notice that about 6 months happened between start to finish. I tried so many options and you will see, it is not easy to find room for a second calipers. And because it physically clears, it doesn't mean it will be sturdy. Be wary of long and thin brackets that will oscillate when brakes are applied.

    https://www.bimmerforums.com/forum/s...aliper-Bracket

    That being said, any new perspective on a similar goal is always welcome. Let us know what you end up with. ;-)
    1969 2002 racecar + 1989 e30 M3 racecar


  11. #11
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    Quote Originally Posted by Massive Lee View Post
    If you look at thread that was started by a member years ago and that depicted how I came into designing the hydraulic handbrake brackets, you will notice that about 6 months happened between start to finish. I tried so many options and you will see, it is not easy to find room for a second calipers. And because it physically clears, it doesn't mean it will be sturdy. Be wary of long and thin brackets that will oscillate when brakes are applied.

    https://www.bimmerforums.com/forum/s...aliper-Bracket

    That being said, any new perspective on a similar goal is always welcome. Let us know what you end up with. ;-)
    i would buy your bracket, but unfortunately i absolutely need a handbrake for parking. i live out in the Texas Hill Country and EVERYWHERE is slanted/hilly. hell, my driveway is probably at 15 degrees uphill, and the street where i park my truck daily is around 10 degrees downhill.

  12. #12
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    Quote Originally Posted by RandomHero27 View Post
    i would buy your bracket, but unfortunately i absolutely need a handbrake for parking. i live out in the Texas Hill Country and EVERYWHERE is slanted/hilly. hell, my driveway is probably at 15 degrees uphill, and the street where i park my truck daily is around 10 degrees downhill.
    If you car is a manual, always leave it in first gear. If it is an automatic, Park locks the wheels. ;-)
    1969 2002 racecar + 1989 e30 M3 racecar


  13. #13
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    Quote Originally Posted by Massive Lee View Post
    If you car is a manual, always leave it in first gear. If it is an automatic, Park locks the wheels. ;-)
    First gear wont hold in my driveway.

  14. #14
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    Quote Originally Posted by RandomHero27 View Post
    First gear wont hold in my driveway.
    45° slope ? ;-)
    1969 2002 racecar + 1989 e30 M3 racecar


  15. #15
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    Looks like those calipers will also fit on my E46 M3 rears. Yay!

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