MR2Heaven Heavy Duty 13" Wilwood REAR BIG Brake Kit - Optional Rear Dual Parking Brake Caliper - SW20
Notes - 11/3/2021 - For component stock availability, please read the news on our front page of the website
We, MR2Heaven present the ultimate Heavy Duty 13" REAR BIG Brake Kit for the of the 1991-1998 MR2 utilizing many of the best and highest quality components available on the market while also being budget friendly.
Also available with Wilwood Parking brake Dual Caliper Option Add On - Yes you heard that right - Keep your OEM handbrake!
This page is for Rear brakes only. If you need Front brakes, visit here
Tired of brake fade, unreliable, unpredictable, vibrations, non confidence inspiring braking performance or simply outgrown your stock brake setup? We've been there before. Whether you're aiming for going hard on a racing circuit all day to set a new track record, or simply upgrading the performance of your MR2, going for the cool exotics sports car appearance or trying to fill the gaps in between your wheels with the biggest and coolest brake system out there, we've got you covered with our headache free kits. (We wont judge your priorities) The highest quality and best performing kits on the market and we even have the Rear Parking Brake setup figured out for the rears using a dual Wilwood caliper setup
13" - Heavy Duty - Largest and thickest Rotor available
We designed this kit to utilize the largest and thickest possible rotor (Coming in at a whopping 13") matching front and rear brake rotor diameter for a proper and menacing side appearance. Front and Rear Rotors are of different thickness as expected to help aid in temperature distribution between front and rear brake pads for proper friction coefficient and proper brake bias.
- By utilizing the largest rotor we could fit while being compliant on 17" wheels, this kit outperforms while costing significantly less, offers more brake pad/rotor selection flexibility, better brake rotor cooling and heat management, longer lifespan and reliability than the more expensive smaller and thinner 12" 2 piece rotor kits on the market. Replacement rotors are also significantly cheaper and lasts much longer when factoring track use. They also don't suffer from rotor mounting tabs breaking off or loose fasteners and the increased noise, whether clicking, clunking or humming associated with a 2 piece brake rotor setup. This setup also avoids the use of safety wire and self locking jet nuts that only withstands ~450F connected directly to a hot 1000-1300F iron brake rotor, no thanks.. Not only are the rotors larger in diameter, they are also thicker in thickness.
Size Matters - Better Heat Management/Reliability - Lower consumption rates
Simply put, It is all about heat management and size definitely matters. MORE MASS equals more thermal abuse the system can take while stopping the same amount of kinetic generated energy by a car and lower temperatures of your brake system overall. That is physics and why bigger cars like SUVs or sports cars like Porsche have bigger and heavier rotors. Its the same reason you're upgrading to a "big brake" kit, because of the bigger, heavier and better designed (internal fin/vane structure of the rotor is very important) rotor to combat the increased heat generated/increased braking needs. Lower temperatures leads to a bonus of longer lifespan and lower consumption rate of brake pads and rotors as well as more reliable and consistent braking.. That means you'll be replacing your rotors/pads less often!
- When your brake system generates too much heat and cannot dissipate it quick enough, you will experience brake fade, where increased brake pedal effort is needed once the pads grip/friction coefficient drops after exceeding a certain temperature range. If you notice brake fade while braking at slower speeds, consider yourself lucky! If not, if you brake at 80-100mph+, you may instantly exceed the temperature range of your brake pads and overshoot the car into a corner onto oncoming traffic or into street intersections no matter how much pressure you put on your brake pedal. The car would simply not slow down quick enough or at all despite mashing the brake pedal with all your might.
Better Thermal Cooling
Secondly, by utilizing a larger rotor and especially one with internal directional fin/vane design, the brake rotor can cool itself more efficiently while rotating by channeling more air through its larger surface area whether on the outer rotor surface or within its internal channeled and fin/vane structure. The more internal fins/vanes, the better! Simply increasing the # of vanes and orientation will increase cooling by 7 to 15% or more. Real world tests have shown that simply increasing the # of vanes and applying an orientation to the vanes will lower rotor temperatures on track use by 7 to 15% or more. That can be a difference of 150F at 850F vs 1000F degrees simply by having vane/fin orientation versus not having an orientation on vanes/fins inside a rotor.
More Brake Pad Options
Thirdly, by utilizing a larger brake rotor which will run cooler, you have more options such as running a street pad/semi track pad instead of a full race pad which does come with drawbacks such as poor cold friction performance and high pitched hard squealing that may come with some race only orientated pads.
- OEM pads on many cars usually taper off sharply in friction coefficient (the bite feeling) around 600F. Which is why your brakes will or did not do anything despite the pedal being all the way to the floor because once the pads exceeds 600F for example, the friction coefficient drops significantly to almost nothing, this is known as brake fade. There is simply no more friction left to bite or grab onto anything, this is known as brake fade.
Highest Quality Components
- Proven Wilwood Forged Superlite Calipers - 4 pistons each, lightweight, lab and track tested, proven and wallet friendly. Can also be powder coated by Wilwood themselves either Black or Red. Made in USA.
- Proven Brake Pads from HAWK or Wilwood - Engineered, lab and track tested, proven. Not your typical untested eBay/cheap pads. BP10 tested to 900F+, BP20 to 1100F+. Wilwood Temperature/friction charts available see here (Wilwood pads), here (HAWK pads). Other brand pads such as Carbotech, EBC, PAGID, StopTech also work, but to simplify our offering, we only carry HAWK and Wilwood. General rule of thumb is OEM brake pads for sport cars are good for up to 600F on small rotors before dropping off on friction (brake fade - where you step on the brakes and it doesn't stop). The higher temperature resistant a pad is, typically the louder the noises it will generate.
- HAWK High Performance Street **VERY POPULAR - Good up to 750F-800F - Great for high performance street use with extremely low wear, noise (as loud as oem pads if any noise) and dust. Higher bite feeling than wilwood pads. Great for beginner/intermediate/advanced level drivers on ultra high summer performance street tires (Michelin Pilot Sport 4S etc) looking to have lots of fun driving near the limits. If you have brake ducting/cooling set up, these pads will suffice for light duty track use under an beginner/intermediate/advanced level driver with most common bolt on power upgrades under 330whp while using ultra high performance street tires (For example, Michelin Pilot Super Sport 4S). Expect 2-7 hard laps with a cool down lap in between.
- HAWK High Performance Street Plus - Good up to 850-900F - Great for high performance street use with low wear, noise and dust. Higher bite feeling than wilwood pads. Great for beginner/intermediate/advanced level drivers on ultra high summer performance tires who like to push limits on the streets. Can hold up to light/intermediate level track use on ultra high performance street tires and for MR2s with a bit more mods. Pads that are built for this temperature range are a bit noisy for people who are not used to using high performance pads, i.e, they may squeal lightly at every stop when cold. Goes away when warm.
- BP-10 High Performance Street/Track use - Good for up to 950-1100F. Perfect for street and moderate/heavy duty track use. Suited for beginner/intermediate/advanced drivers making around 300-350whp on ultra high performance/semi slick tires with some aerodynamic downforce mods. As expected with all high performance street/track pads, these will squeal a tiny bit when cold, can probably be heard up to 1-3 cars away when standing outside. Fortunately any braking noise does goes away completely after 1-2 hard stops like (60-20mph).
- BP-20 Streetable/Heavy duty track pad **POPULAR - Good for up to 1200-1250F - Easy to modulate braking and very consistent. Good reliable bite when cold. Will take huge amounts of abuse on track consistently lap after lap while you search for the best track times with your heavily modified MR2. Geared towards intermediate/advanced/professional drivers. If its a very high performance street or dedicated track car with many hardcore race orientated mods, these pads are great and it happens to be dual purpose. If you're looking past this point, make sure you have some kind of brake ducting in place as it helps significantly with cooling and you may not need to upgrade past this point after all. These pads should work very well with 99.9% of MR2 drivers in our opinion.
- As expected with this high of a level temperature performance street/track pad, these will sound like a train stopping/squealing when cold just FYI. Louder than BP-10s and can be heard from a person standing up to 3-6+ cars away when cold. Some owners think the sound is cool and race car like and some may be very peculiar/sensitive and may find it annoying for city use. But if you're driving a MR2 to a level which requires these pads, your MR2 probably isn't anywhere close to being comfortable anyways. Fortunately any braking noise does goes away completely when warm, such as after 1-2 hard stops like (60-20mph).
- BP-30 High temperature racing pad - RACE ONLY (We mean it - Like actually racing other cars or endurance racing where you're expected to do 10-15 or more laps non stop) - Good for 1200-1450F. Not for street use. Great for advanced/pro level road circuit competition and time attack. Expect these to squeal loudly when cold.
- BP-40 - Xtreme High Temp Racing Pad - Good luck, try and fade these :)
- High Quality Brake Caliper mounting brackets are made out of 1 piece CNC Billet 7075-T6 Aerospace grade Aluminum (stronger and 1/3 the weight of most mild steels). Hard anodized for extreme environmental protection. Some mr2 sellers uses outdated multi piece steel brackets that are either bolted or welded together and then painted over with black paint. Yes they're cheaper to make that way. 3x the weight as ours. They might be welded together unevenly. Chip those and they'll rust. Curious?
- High Quality Brake Rotors - Sourced from Stoptech (Centric) directly. They are one of the biggest brake component manufactures in the world. With state of the art manufacturing facilities, they're able to produce brake rotors with the best material, through the correct processes to ensure they're properly balanced and flat to ensure maximum lifespan, strength, performance, correct hardness, microstructure, reduced warping, reduce cracking, reduced wear rates, reduced vibration and noise during operation. Even impurities in the material or how it is treated/cooling rate in the casting mold in the factory matters, cooled too quickly will produce noisy rotors. Too soft of a rotor will create pedal pulsation problems. Too hard will increase noise and run a higher risk of cracking. Iron that is impure will cause hot spots and pedal pulsing. - Yes some mr2 vendors uses ebay/alibaba rotors from china with literally crappy gray or black paint over them as a result of cost cutting. The grade of the metal and treatments used? Wear/life span? Warp resistance? Evenly balanced? Who knows. You have been warned. Curious how theirs look like?
- Brake rotors are available plain, slotted only, or drilled and slotted. Personally, for very high level track use, slotted is best. Plain is decent for track too and at a very low cost to replace. Drilled/Slotted looks good and performs well on track but is more prone to cracking. These rotors are vanned/have inner air passage channels and are designated either Left or Right side so please make sure you install the correct side or the rotor would not cool properly.
- Higher performance rotors generally equates to lower rotor operating temperatures due to better cooling from improved internal vane structures as well as increased vane/fin count. Other improvements are reduced noise/vibration, chances of cracking/pulsation/hot spots/failure and increased lifespan from use of better material and improved curing/handling/processing/treatment of the metal being used.
- High Quality Made in USA D.O.T. Approved One Piece Brake Lines - US Department of transportation approved Technafit Branded custom Wilwood stainless steel lines. Made from the finest PTFE core, crimped on Zinc plated steel fittings, stainless wire braided cover and finished/wrapped in a clear PVC outer cover to protect against harsh chemicals, elements and debris. Designed to prevent swelling and expansion which happens on stock lines and to prevent any exposure to harsh chemicals causing stock OE rubber deterioration. Some mr2 sellers use cheaply made unbranded lines with multi piece fittings (Sounds like a possible leak coming!) made in China. I wouldn't be surprised if some of their fittings easily gets deformed too, fall apart or lines leak due to incorrect machine clamping pressure or machining all in the name of cost cutting and profit. Oh well. You have been warned. Curious?
- High Quality Hardware kit - Heavy duty Grade 12.9 Black Oxide Bolts/screws, Stainless steel and Zinc Coated washers and lock washers ready to weather through abusive environments - All Pieced together and sourced from trusted source McMaster Carr.
- Hardware and basically everything to replace your existing OEM brakes
- Pair of (one solid piece/billet) LIGHTWEIGHT 7075-T6 Aerospace grade aluminum mounting brackets to mount Forged Superlite Wilwood quad piston brake calipers
- Pair of heavy duty US D.O.T. Approved Technafit stainless steel brake lines
- Pair of Forged Superlite Wilwood Calipers
- Pair of authentic StopTech/Centric high quality heavy duty brake rotors (Available as plain, slotted or drilled/slotted) or one may source rotors themselves
- A pair of brake pads of your choice or source your own
Wilwood MC-4 Parking Brake Caliper Kit Add on
- Custom Parking Brake Cables
- A pair of MC-4 Calipers - Color matched with your main caliper
- Parking brake caliper mounting bracket is made from 6mm thick carbon steel and finished with a matte black protective coating
- Additional mounting hardware, brake pads, brackets
- All 1991-1998 Toyota MR2
- This product page is for the REAR Brakes Only - It includes everything to replace your existing working front OEM Brakes.
- Visit our matching Front big brake kit with parking brake page here.
- Our front and rear kit when paired together meets or exceeds OE brake bias dynamics
- If you're on an OEM Non Turbo Brake proportioning valve, our F&R kit does extremely well with BP10 & BP20 pads and significantly improves on the OEM 1993+ Turbo Brake Bias curves by a significant amount. From 0.5 to 0.7G, 60-63% front biased and from 0.7 all the way up to 1.4G results in ideal 63%-68% front bias respectively to help prevent the rear wheels from locking up as more weight is shifted towards the front of the car during harder braking. For comparison, 93 OE turbo brake system manages 60-65% front bias throughout 0.8-1.4Gs respectively. Most sticky street legal track racing tires on track cars can commonly pull around 1.0-1.3G before exceeding available tire grip.
- If you are on an OEM Turbo Brake proportioning valve, our F&R kit does decently with BP10 & BP20 pads. Throughout 0.5 to 1.4gs of deceleration, the front and rear kit maintains stable 62-64% front bias and around 36% rear bias, very similar to OEM 93T brake bias.
- 17" Wheels required
- You can piece your own kit with our mounting brackets as well! Click here
- For budget builds - This kit will also pair nicely with our budget 93+ OEM BBK kit utilizing a matching diameter 13" rotor here
- The supplied optional parking brake kit is not intended for drifting or sliding of the car.
- Please note that higher temperature racing pads usually have poor friction characteristics when brakes are cold. That means you may notice your car may not stop or bite as hard when your brakes are cold. This can be dangerous and may surprise most people if they are not aware or used to racing brakes. That is the tradeoff for most extreme high temperature brake pads orientated for racing use. General rule of thumb is the higher the temperatures ranges of the pad, the worse it is for cold brake performance.
- These brake parts are intended for off road use only, they are not intended to be used on the streets/highways. Whatever you do with your car is up to you and your responsibility.
- While we strive for the highest quality brake components accessible to us, we are not responsible for any damages, injuries, accidents or death to you or others due to the use and installation of these supplied parts. All responsibility is on is on you. Ordering from us or using our supplied brake parts constitutes your agreement to these disclaimers.
- This kit fits most aftermarket wheel setup for the MR2. If you are unsure or want to be certain, our wheel to caliper fitment/clearance template for the kit can be used. (Rear)