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Thread: Parking Brake - Wilwood MC4 - FFR818

  1. #1
    Junior Member
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    Parking Brake - Wilwood MC4 - FFR818

    I'm really quite pleased with myself and wanted to share here. So I found myself with no solution for an e-brake/parking brake and came up with this.

    Basically, I went with a foolishly high horsepower motor (497 rwhp based on last dyno run) and needed heavy custom axles and therefore needed to use an STI knuckle. The STI knuckle I used was from a 2004 STI since I wanted 5x100 to match my wheels (which I'm going to replace anyway, so turns out that was dumb). Anyways, the STI knuckle works with the WRX-intended big brake kit from Wilwood so long as you don't try to use the e-brake setup. (The Wilwood big brake kit, I purchased from Factory Five but its intended for a 2007 WRX, not an STI).

    So, that's a long story to say that I now had a car with 6 pot fronts, 4 pot rears on a 12.88"x1.1" rotor and no parking brake.

    Then I thought hey, Wilwood makes an MC4 mechanically operated parking brake caliper. I'll use that. I order them and it turns out it only fits a 12.88x0.8" rotor. <sigh>

    So I extended the caliper bridge to fit the 1.1" rotor and made a custom mount and I'm very happy with the result and look!

    Anyways, here is the car and the parking brake setup works mint!
    Attached Images Attached Images

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  3. #2
    Senior Member AZPete's Avatar
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    Very nice solution! A big part of the fun building is finding innovative ways to solve a problem. Congrats.
    818S/C : Chassis #25 with 06 WRX 2.5 turbo, ABS, cruise, PS, A/C, Apple CarPlay, rear camera, power windows & locks, leather & other complexities. Sold 10/19 with 5,800 miles.
    Mk3 Roadster #6228 4.6L, T45, IRS, PS, PB, ABS, Cruise, Koni's, 17" Halibrands, red w/ silver - 9K miles then sold @ Barrett-Jackson Jan 2011 (got back cash spent).

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  5. #3

    Yes, I love Technology
    aquillen's Avatar
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    Really well done - thanks for sharing.

  6. #4
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    Look good!

  7. #5
    Senior Member DodgyTim's Avatar
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    Wilwood also do a 4 pot caliper with a integral handbrake assembly, not listed in most of their catalogs
    Wilwood Powerlite calipers 120-13517
    I used them on a buggy, not my 818
    wilwood.jpg
    They wouldn't have fitted your configuration, but may be of interest to others
    120-13517
    Piston Size / Count: 1.00" / 4
    Rotor Diameter / Width : 9.5"-11.25" / 0.81"
    Mount Type / Location: Radial / Universal
    Finish: Black Anodize
    Last edited by DodgyTim; 09-01-2019 at 06:51 PM.

  8. #6
    Senior Member metros's Avatar
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    Nicely done

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