Big Brake Kits

Wilhelm Raceworks brake kit for Toyota MR2

Not all brake kits for the MR2 are created equally! 

Many other kits on the market for utilize 323mm (12.72") rotors off of the Supra and RX8, and while these are an economical solution, at 21 lb for the front and 18 lb for the rear, the rotors are HEAVY.  The Wilhelm Raceworks kits improve braking performance, without adding extra weight! 

Built around two piece 12.19" rotors, the Wilhelm Raceworks heavy duty kit saves 7-8lb per corner  (~30lb total) compared to a kit based on Supra / RX8 rotors.  The rotors are each about 3lb lighter than stock 93+ MR2 Turbo rotors.  The calipers save ~14lb compared to stock calipers, making the complete brake system weight nearly identical to 91 MR2 Turbo brakes.  Compared to the larger and heavier 93+ Turbo brakes, the heavy duty kit saves about 25lb. 

For a more budget friendly and lighter weight option, Forged Narrow Dynalite calipers and Ultralite rotors save an additional 10lb.  Or mix and match to suite your needs.

The kit uses Wilwood Forged Superlite (FSL) or Forged Narrow Dynalite (FNDL)  four piston calipers for all four corners plus Wilwood MC4 mechanical parking brake calipers.  Removal of the stock rotor dust shields is required.

Made in the USA!

Wilhelm Raceworks Heavy Duty Front BBK Installed Wilhelm Raceworks Heavy Duty Rear BBK Installed

Brake Kit Installed with FSL Calipers

The complete Wilhelm Raceworks Brake Kit consists of the following parts:

  • Aluminum caliper brackets, front and rear
  • Hardware for attaching the brackets and calipers
  • Four custom made Wilhelm Raceworks aluminum rotor hats
  • Socket head cap screws and "jet nuts" for attaching rotors to hats
  • Steel braided PTFE brake lines front and rear
  • Aluminum bracket for parking brake calipers with attachment hardware
  • Custom parking brake cables
  • Your choice of Wilwood FSL or FNDL calipers
  • Choice of Wilwood rotors, blank, slotted, or "ultralite"
  • 2x Wilwood MC4 mechanical calipers
  • Choice of Wilwood BP10 or BP20 brake pads, or omit the pads if you have another favorite

SKU Front Brake Kit
In Stock
* Caliper Options:

* Rotor Options:

SKU Rear Brake Kit
In Stock
* Caliper Options:

* Rotor Options:

Adjustable proportioning valve kits available here.

Installation Instructions


Wilhelm Raceworks Ultralite Brake Kit

Kit with optional FNDL calipers and Ultralite Rotors

For those looking for a more budget friendly and even lighter weight option choose the Wilwood Forged Narrow Dynalite calipers and Wilwood Ultralite rotors.  The calipers and pads are slightly smaller, and the rotors are lighter weight.  Not only does this save you some money, it saves an additional 10 lb off the brake system weight.  Suitable for street, autocross, and occasional track use.  If you are building a serious track car I recommend the FSL calipers and HD or GT rotors.


  • Beginning July 2019, all brake Wilhelm Raceworks brake kits come with socket head cap screws and Mil-Spec MS21042-5 self locking "jet nuts" for attaching the rotors to the hats.  NO MORE SAFETY WIRE REQUIRED!  If you have an older kit and want to convert to the new attachment I can modify your hats for $10 each, plus $10 per rotor for the new hardware kit.

Rotor hardware


  • The Wilwood BP20 pads will handle quite a lot of track abuse in my experience, but they can be a little noisy when cold.  The BP10 is more street friendly.  Other pads are also available.  Please contact me if you wish to discuss substituting alternate pads.
  • For those looking for extra front wheel clearance, I can also substitute the thinner rear rotors and hats for the normal fronts, along with a narrower front caliper.  This will save you ~0.44in (11mm) of caliper to spoke clearance.  Please leave me a note in the checkout if you would like this option (cost is the same as a normal front kit)
  • The standard calipers included in the complete kit provide a moderately conservative brake bias with the NA proportioning valve, and a more aggressive bias with the Turbo valve.  If you have an adjustable proportioning valve, larger rear calipers will provide better overall bias. Feel free to contact me if you wish to discuss brake bias in more detail.
  • Red or black powder coated calipers are special order items and will take an extra 3-4 weeks to deliver.
  • The calipers, rotors, and pads ship directly from a distributor and will arrive separately from the rest of the parts.
  • The calipers available for this kit do not include dust seals.  This can be a problem for passing inspections in some locations.
  • The HD or GT rotors are generally recommended for heavy track use.  The Ultralite rotors will work, but may need to be replaced more frequently.
  • The Forged Narrow Dynalite caliper is unique among Wilwood calipers in that it has a raised logo, and when ordered with powder coating the logo is not laser engraved.  If you would prefer the silver logo like other Wilwood calipers chose the machined logo option.  Otherwise the raised logo will be the same color as the rest of the caliper.  Gray anodized calipers will come with the machined silver logo as shown in the pictures.

StopTech Big Brake Kit

Stoptech ST42 calipers

The ultimate MR2 brake kit!  Replaces the Wilwood calipers with Stoptech's ST-43 Race caliper for industry leading caliper stiffness, plus staggered pistons to combat pad taper wear.  Additionally, the piston sizes are specifically chosen to optimize brake bias for the MKII MR2.  You won't find these calipers anywhere else!

Wilhelm Raceworks Stoptech Front BBK Installed Wilhelm Raceworks Stoptech Rear BBK Installed

The complete Wilhelm Raceworks StopTech Brake Kit consists of the following parts:

  • Wilhelm Raceworks aluminum caliper brackets, front and rear
  • Hardware for attaching the brackets and calipers
  • Four Wilhelm Raceworks aluminum rotor hats
  • Socket head cap screws and "jet nuts" for attaching rotors to hats
  • Techna-Fit Steel braided brake lines front and rear
  • Aluminum bracket for parking brake calipers with attachment hardware
  • Custom parking brake cables
  • 2x StopTech ST43 Race front calipers
    • 30mm/34mm staggered pistons for stock NA or adjustable proportioning valve
    • 34mm/38mm staggered pistons for stock Turbo proportioning valve
  • 2x StopTech ST43 Race rear calipers 
    • 26mm/28mm staggered pistons
  • 2x Wilwood MC4 mechanical calipers
  • Choice of Wilwood rotors, blank, slotted, or "ultralite"
  • StopTech Sport brake pads, suitable for street and moderate track use (other pads available on request)


SKU StopTech Big Brake Kit
* Add Parking Brake?:

* Rotor Options:

* Caliper Color:

* Caliper Piston Sizing:

Adjustable proportioning valve kit available here.

Installation Instructions 


  • The StopTech calipers in this kit are made to order.  Lead time has been longer than normal recently, as much as 6 months in some cases.
  • The calipers included in this kit do not include dust seals.  This can be a problem for passing inspections in some locations.
  • If you have a favorite brand of brake pads you wish to use, the pads can be eliminated from the kit, or an alternate pad can be substituted.  Please contact me to submit a custom order if you would like pads other than the standard StopTech Sport pad.

Basic Big Brake Kit

Wilhelm Raceworks BBK brackets and hardware

If you prefer to purchase the rotors, calipers, and pads yourself, the basic kit contains all of the custom parts of the kit.

SKU Basic Brake Kit
In Stock
* Kit Type:

To complete your brake setup you will also need to purchase or already have:

  • 2x Wilwood FSL or FNDL calipers for front
  • 2x Wilwood FSL of FNDL calipers for rear
  • 2x Wilwood MC4 mechanical calipers
  • 2x 12.19" x 1.25" rotors with 8x7.00" bolt pattern
  • 2x 12.19" x .81" rotors with 8x7.00" bolt pattern
  • 2x Brake pad set for your choice of calipers

Installation Instructions

Technical Info


This kit can use virtually any 12.19" rotor with an 8x7.00" bolt pattern, 1.25" thickness for the front and .81" thickness for the rear.  There are numerous options from various manufacturers including Wilwood, Afco, Colman Racing, and many others.  They are available with straight or curved vanes, and slotted, cross drilled, or both.  The Wilwood options are shown in the chart below.  There are many others on the market as well.  Be sure to purchase one right and one left if buying curved vane rotors!

Front Rotors (12.19"x1.25")
Model LH Part # RH Part # Vane Style Price Weight
Wilwood GT48 (slotted) 160-11840 160-11839 Curved $153 12.7lb
Wilwood HD48 160-11836 160-11835 Curved $137 12.7lb
Wilwood Ultralight 160-2895 160-2894 Curved $82 10.5lb
Rear Rotors (12.19"x.81")
Wilwood GT36 (slotted) 160-12292 160-12291 Curved $137 9.5lb
Wilwood HD36 160-12290 160-12289 Curved $114 9.5lb
Wilwood Ultralight 160-0277 Straight $43 8.9lb



Caliper choice is important to optimize brake bias for maximum braking potential, while minimizing the chance of locking the rear brakes before the fronts.

For MR2s equipped with the non-turbo brake proportioning valve, the standard 1.38" / 1.12" calipers provide a slightly conservative bias.

For those with the turbo proportioning valve the 1.38" / 1.12" caliper combination will provide optimal bias at about 1g deceleration.  High grip race tires and high friction pads may require an adjustable proportioning valve, or a swap to the non-turbo proportioning valve.

When an adjustable proportioning valve is used, increasing the rear piston size to 1.25" will produce better bias over a wider range of deceleration rates.

More details on brake bias and the effects of various caliper / pad / proportioning valve combinations can be found on my Brake Bias page.  Please contact me if you have questions about choosing calipers for your setup.  Note: FSL = Forged Superlite, FNDL = Forged Narrow Dynalite

Recommended Wilwood Calipers
Part # Piston
Position Notes
FSL 120-11130 1.38" 1.25" Front Standard piston sizes supplied with kits.
FNDL 120-11576
FSL 120-11126 1.25" .81" Rear Adjustable proportioning valve recommended.
FSL 120-11125 1.12" .81" Rear Standard piston size supplied with kits. 
Optimal with NA proportioning valve. 
Slightly aggressive bias with turbo proportioning valve.
FNDL 120-11578


Another caliper option is to use the 1.62" calipers in the front, paired with either the 1.38" or the 1.25" in the rear.  The 1.25" piston setup is a bit more conservative than the setup above, but should provide good performance.  It will also reduce overall brake system pressure.  An adjustable proportioning valve is recommended for the 1.38" rear option.  This may also be an option for those who already have a set of calipers they want to use.  Part numbers for this option are listed below.

Alternate Wilwood Calipers
Part # Piston
Position Notes
FSL 120-11133 1.62" 1.25" Front  
FNDL 120-14333
FSL 120-11128 1.38" .81" Rear Adjustable proportioning valve strongly recommended.
FNDL 120-11575
FSL 120-11126 1.25" .81" Rear  


The parking caliper used with the kit is the Wilwood MC4.   One of each LH/RH is required.

   Wilwood MC4 Parking Calipers
LH Part #  120-12070-BK
RH Part #  120-12069-BK

The part numbers above are the black powdercoated version.  Red and silver are also available.

Brake Pads

Many companies make pads in many different compounds for the Wilwood FSL caliper, including but not limited to: Wilwood, Stoptech, Porterfield, Performance Friction, Hawk, Raybestos, etc.  The Wilwood pad shape for the FSL calipers or the Stoptech ST43 is #7420, and for the FNDL is #7816.


Custom Parts

The Wilhelm Raceworks hats and main caliper brackets in this kit are machined from 6061-T6 aluminum, and black anodized.  All are designed around the brake torque required for 1.4g deceleration, and with a factor of safety of 2x on the 500 million cycle fatigue strength of 6061-T6 aluminum.

The parking brake system in these kits is capable of achieving deceleration rates of ~.3g.  More than enough to pass the emergency brake function tests that I am aware of.  However, it is ultimately designed and intended to be a parking brake, or for that once-in-a-lifetime emergency situation.  If you are drifting or doing hand-brake turns, you may find it to be insufficient.

Assuming adequate spoke to caliper clearance, most 16" wheels should fit over the front brakes without issue.  The parking caliper in the rear might cause an issue with some 16" wheels.  Use the template below to check fit on your wheels before ordering.

Caliper Clearance Template for HD Brake Kit

Caliper Clearance Template for Ultralite Brake Kit

Caliper Clearance Template for Stoptech Brake Kit


  1. Thursday, 04 November 2021 14:12
    I have purchased a big brake kit from MR2 Heaven, I 100% would've bought your kit if I've known about you guys before I made that decision. Anyways, they didn't send me the right rotors and the brake pads sit 2mm off the rotors. I was wondering if you could give me a quote for front and rear rotors with the hats. I know you put the part numbers in there but I'm having trouble finding the hats and am a little afraid of messing things up and I don't want to end up with the wrong rotors AGAIN.
    1. Thursday, 04 November 2021 14:26
      Hey Logan.The big question is if that mis-match is due to the rotors, or due to a problem with their brackets.  It might be possible to build rotors using my hats and Wilwood rotors that would match the diameter, thickness, and offset of the Supra / RX8 rotors, but the rotors in those diameters are pretty expensive (a lot more than the 12.19" rotors that I use in my kit), plus I'm not sure if the offset would match.  And you can't just use the rotors that I use in my kit with their brackets, as they are a little smaller (12.19" vs 12.72").The thing to check is if the rotors they sent match the size they should be (check Rock Auto for specs on the Supra TT / RX8 Sport front rotors).  If yours match, then the problem is likely with the MR2 Heaven brackets, not with the rotors.
    2. Thursday, 04 November 2021 14:51
      Okay, Thank you so much alex.
  2. Friday, 10 December 2021 14:35
    Hello Alex,
    Would either the Heavy Duty or Ultralite Wilwood Big Brake kit fit inside a 16" wheel or would I need to go to a 17"?
    1. Friday, 10 December 2021 14:42
      Diameter wise they should fit in most 16" wheels.  Biggest thing to check is clearance to the parking brake caliper, that's the largest diameter part (use the template for this).  The bigger issue is usually spoke clearance, especially if the wheels are high offset or have particularly flat faces.
  3. Thursday, 10 March 2022 15:05
    Is it possible to order just the parking brake cable and parking brake backet? Or do they need to be bought with the kit? 
    1. Saturday, 19 March 2022 10:16
      Hi Anthony,I can sell you those parts separately, but they will only fit if you already have my rear brake kit.  Every other kit on the market uses a different rotor size, so the brackets would be wrong.
  4. Tuesday, 31 May 2022 08:13
    I received the link to your page from friends in the AW11 Facebook group. I'm searching for a front brake kit for an AW11. I only will use it for track racing. The wheel size(diameter) is limited to max. 15". Can you recommend / offer something?
    Kind regards
    1. Tuesday, 31 May 2022 14:45
      Sorry Martin, I don't have any brake parts for the AW11.
  5. Sunday, 05 June 2022 11:56
    I have a set of rotors for a 1991 toyota mr2 turbo that are 12 and 11/16" or 322.2625mm with an adapter kit that was said to have come from you any ideas by chance like maybe the front rotors on an RX-8.  It has like a 1 inch adapter plate to the brake calipers 
    1. Sunday, 12 June 2022 09:55
      I have never produced an adapter to use that size rotor, but I did make a one-off adapter years ago to run stock 93+ Turbo calipers on the back of the car with RX8 Sport front rotors.  Email me a picture of the adapter and I can confirm if it's the one I made or not.
  6. Saturday, 02 July 2022 11:27
    Hey Alex,
    For your rear knuckles, is there a way to attach the e-brake caliper? I’m prepping to install the kit and it looks like if I change the geometry of the rear I lose the E-brake mounting points. 
    best regards, 
    Abimael  Mercado 
    1. Saturday, 02 July 2022 12:27
      The rear knuckles have mounting points for the parking caliper bracket built in.
    2. Saturday, 02 July 2022 20:21
      I realized that after I made this comment, I apologize. I’ll take a lap!
  7. Thursday, 06 October 2022 23:42

    Hi Mr Wilhelm,

    I have heard much about you from my friends who have SW20s (x2 Rev5s) and a SW21. Any who, I have a mighty 5S with an auto trans and I want to do a 2GR swap and make the ULTIMATE track MONSTER. I'm curious whether you think I should purchase this brake kit first or do the 2GR + e153 first, I'll be grabbing both regardless for my final form. My non 2er friends say they'll beat me with an Aliexpress built Fiero, I can't let that happen and with the help of you and Frankenstein, it won't happen. God bless you.

    1. Tuesday, 18 October 2022 16:35

      It probably makes the most sense to get the engine swap done first, although there is no reason not to do it the other way around.

  8. Tuesday, 25 October 2022 16:05

    Hey Alex, I purchased your Wilwood heavy duty brake kit and my builder is telling me it looks like my TRD rear sway bar may interfere with the e-brake caliper.  Are you able to tell me if this should work together or not by chance?   Thanks for everything!

    1. Tuesday, 25 October 2022 23:12

      It should clear, but it may be close.  It could also depend on the exact sway bar, some could be a bit wider at the tip than others.  It cleared with the Whiteline that I test fit with, but I have not tried every sway bar option.  Shorter end links can also help to pull the bar up a little higher if it's not clearing.

  9. Tuesday, 22 November 2022 17:35

    Will you have a Black Friday deal this ear?

    1. Wednesday, 23 November 2022 09:44

      No, not this year.

  10. Sunday, 08 January 2023 09:23

    Would 120-11133 up front and 11125 in the rear work? 

    1. Sunday, 08 January 2023 10:08

      Not very well.  That's a very big front caliper and a very small rear, which is going to give you way too much forward bias and overall braking performance will suffer.  See this article for more detail

  11. Wednesday, 22 February 2023 11:21

    will either kit fit 16 inch wheels? if so what wheels and specs have you tested?

    1. Wednesday, 22 February 2023 11:57

      They should fit most 16" wheels.  I don't have a complete list of those that fit and those that don't, but it's easy to check with the templates.

  12. Thursday, 30 March 2023 11:24

    Good day, would these break kits have the squeal that big break kits seem to be proned to? 

    Personally I'm looking at the budget street package you offer 

    1. Thursday, 30 March 2023 11:31

      That is mostly a pad issue in my experience.  The BP20's will squeal when cold, in my experience the BP10's are quiet.  And there are of course lots of other street friendly pads out there that you could use in place of the Wilwood pads that I offer.

  13. Saturday, 15 April 2023 18:54

     What's the difference between the fsl and fndl Wilwood calipers?

    1. Saturday, 15 April 2023 19:14

      The Superlites take a larger and thicker pad, so for heavy track use you have a bit more heat capacity and longer pad life.  They are also available with a larger rear piston which when combined with an adjustable proportioning valve gives you a bit better overall brake bias (not recommended with a stock proportioning valve).  The Forged Narrow Dynalite on the other hand is smaller giving more wheel clearance, and lighter.

  14. Friday, 12 May 2023 15:41

    Question please....

    I need replacement Wilwood front rotors for my MR2 - do you offer the rotors only without the entire BBK? 

    Thank you,


    1. Friday, 12 May 2023 19:07

      Of course.  Just send me an email or message somewhere.

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