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Thread: 2015-2017 mustang front brakes?

  1. #1
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    2015-2017 mustang front brakes?

    So I'm collecting drivetrain parts for a future Type 65 build, have 2015 Mustang IRS rear center section, hubs, 14" rotors and calipers. It seemed that I should also be looking for a way to use the dual piston PBR calipers and the 14" stock Mustang rotors for the front. My understanding is that the forged spindle for roadster and coupe would use the 11" rotors with the PBR dual piston calipers, has anyone made up caliper bracket adapters to get 14's on their front end? And I guess the 14mm wheel stud hubs too? My motivation is to stay with manual brakes, but I'd sure like to have 14's up front!

  2. #2
    Senior Member John Dol's Avatar
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    https://thefactoryfiveforum.com/show...s-please/page2

    Check out post 43.
    15" brakes!!

    John
    Finished the "My Coupe, my way" project.

    http://s956.photobucket.com/albums/ae46/jdcoupe1969/
    Coupe #386,17" Team III 245 FR 315 RR, 3-link, T5, 4 wheel disk, power brakes/steering. Sniper EFI
    First start Sept. 18 2013 First go kart Sept 19 2013

  3. #3
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    Well, I ordered the FTR adapters 6 months ago, haven't heard squat back from them and no response to emails. I assumed I had wasted $175!

  4. #4

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    I think it took about 4 months to get my kit from FTR. The product was ultimately good, but the lack of communication about the backorder was offensive, and for a while I also thought I was swindled.

  5. #5
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    These things look like 2-D plates with spacers- easy to CAD and order online from flat plate.

    Anyone care to share the dimensions or a trace?

    Dave

  6. #6
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    check out what i did here post 52

    used the 2015 mustang gt brakes 4 piston i think 15"
    ended up using 18" wheels in front.

    https://thefactoryfiveforum.com/show...pe-Build/page2

  7. #7
    FFR Maven Logan's Avatar
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    Bumping the thread back to see if there has been any more development on S550 front brakes in the past 6 months or so. I’m interested not just in the base-GT’s 14” rotors with 4-piston fixed calipers as pictured in @forcefed1’s build, but the 15” rotors and 6-piston fixed Brembo calipers which come on all S550 GT’s equipped with the “Performance Package”.

    I’m also curious, has anyone kept the M14x1.5 wheel-studs of the S550, either front or rear? Everything S197 and earlier used 1/2” studs but for 2015+ they’re now the larger M14 size.
    Logan's Gen 3 Coupe-R Build
    Ordered 4/23/19 | Delivered 6/29/19 | First Start 8/1/20 | First Drive 9/20/20

  8. #8
    Senior Member edwardb's Avatar
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    Quote Originally Posted by Logan View Post
    I’m also curious, has anyone kept the M14x1.5 wheel-studs of the S550, either front or rear? Everything S197 and earlier used 1/2” studs but for 2015+ they’re now the larger M14 size.
    The front hubs Factory Five uses, and which their spindles are designed for, are the older Mustang versions that use only SAE 1/2-20 studs. They supply replacement 1/2-20 studs for the 2015+ IRS hubs so that all four corners are the same. They also supply 1/2-20 lug nuts with their wheels. You could leave the metric studs in the IRS hubs if you want. Just would have different size lug nuts in the front vs. rear. I have no idea about the feasibility of changing the front hubs to metric. Haven't tried or looked into it. Even though the M14 stud is slightly larger diameter than the 1/2-inch SAE studs, I don't believe there's any concern about strength with the 1/2-inch studs.
    Build 1: Mk3 Roadster #5125. Sold 11/08/2014. Build 2: Mk4 Roadster #7750. Sold 04/10/2017. Build Thread
    Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020. Build Thread and Video. Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020. Build Thread and Video
    Build 5: 35 Hot Rod Truck #138. LS3 and 4L65E auto. Rcvd 01/05/2021. Legal 04/20/2023. Build Thread. Sold 11/9/2023.

  9. #9
    FFR Maven Logan's Avatar
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    Quote Originally Posted by edwardb View Post
    I have no idea about the feasibility of changing the front hubs to metric. Haven't tried or looked into it. Even though the M14 stud is slightly larger diameter than the 1/2-inch SAE studs, I don't believe there's any concern about strength with the 1/2-inch studs.
    I agree that there isn't too large of concern regarding outright strength of the 1/2-20 studs. Plus, if more strength is desired, upgrading to ARP heat-treated 8740 chrome moly studs (tensile strength of 190,000 psi or more) is always an option. I use ARP M14-1.5 studs in my 2017 Mustang which I abuse pretty hard...and change wheels out a LOT more often than the average driver. I swap between several different sets of wheels at least 4 times a month on-&-off. That leads me to my second point on stud size... my S550 wheels could fit the FFR, with the right combination of spacer(s). They have M14 stud holes and the typical 60° lug-nut cone seat. I am wondering if it's possible to use the S550 front hub on FFR's front spindle, or if I'm pushing into uncharted territory.

    It would be nice to have the full selection of S550 front brakes to choose from, since the rear end of the IRS-equipped FFR's are now S550 spec. There are three tiers of front brakes for the S550 (four if you include the GT350/R). My personal daily driver/track car, which is a GT Performance Package, has 6-piston fixed Brembo calipers with 15" rotors, and they fit inside *most* aftermarket 18" wheels and basically all 19" wheels. They're easy to find and relatively affordable (especially compared to the FFR-specific Wilwoods).

    A larger rotor size and more powerful caliper setup up front could have similar results to the smaller 10-13" front brakes with the extremely aggressive pad compounds that some find necessary to get their manual-brake cars to stop satisfactorily. If it takes a racing pad compound to get good brakes on the street, how well will that same setup perform on track?
    Last edited by Logan; 03-04-2019 at 01:12 PM.
    Logan's Gen 3 Coupe-R Build
    Ordered 4/23/19 | Delivered 6/29/19 | First Start 8/1/20 | First Drive 9/20/20

  10. #10
    Senior Member edwardb's Avatar
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    Quote Originally Posted by Logan View Post
    I agree that there isn't too large of concern regarding outright strength of the 1/2-20 studs. Plus, if more strength is desired, upgrading to ARP heat-treated 8740 chrome moly studs (tensile strength of 190,000 psi or more) is always an option. I use ARP M14-1.5 studs in my 2017 Mustang which I abuse pretty hard...and change wheels out a LOT more often than the average driver. I swap between several different sets of wheels at least 4 times a month on-&-off. That leads me to my second point on stud size... my S550 wheels could fit the FFR, with the right combination of spacer(s). They have M14 stud holes and the typical 60° lug-nut cone seat. I am wondering if it's possible to use the S550 front hub on FFR's front spindle, or if I'm pushing into uncharted territory.

    It would be nice to have the full selection of S550 front brakes to choose from, since the rear end of the IRS-equipped FFR's are now S550 spec. There are three tiers of front brakes for the S550 (four if you include the GT350/R). My personal daily driver/track car, which is a GT Performance Package, has 6-piston fixed Brembo calipers with 15" rotors, and they fit inside *most* aftermarket 18" wheels and basically all 19" wheels. They're easy to find and relatively affordable (especially compared to the FFR-specific Wilwoods).

    A larger rotor size and more powerful caliper setup up front could have similar results to the smaller 10-13" front brakes with the extremely aggressive pad compounds that some find necessary to get their manual-brake cars to stop satisfactorily. If it takes a racing pad compound to get good brakes on the street, how well will that same setup perform on track?
    My last two kits Factory Five has supplied PartsMaster PM513115 front wheel hubs to go along with their 2-piece spindles. Those cross to the SN-95 Mustang 1994 - 2004. I have no idea if S197 or the newest S550 hubs (Ford part number FR3Z-1104-A) will fit the Factory Five spindles. I suspect they wouldn't. When Ford makes changes, typically they aren't interchangeable.
    Build 1: Mk3 Roadster #5125. Sold 11/08/2014. Build 2: Mk4 Roadster #7750. Sold 04/10/2017. Build Thread
    Build 3: Mk4 Roadster 20th Anniversary #8674. Sold 09/07/2020. Build Thread and Video. Build 4: Gen 3 Type 65 Coupe #59. Gen 3 Coyote. Legal 03/04/2020. Build Thread and Video
    Build 5: 35 Hot Rod Truck #138. LS3 and 4L65E auto. Rcvd 01/05/2021. Legal 04/20/2023. Build Thread. Sold 11/9/2023.

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