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BMW StopTech Brakes

StopTech Brakes for your BMW


StopTech is an enthusiast-driven manufacturer of BMW Big Brake Kits and other performance braking components. Since their beginnings in 1999, StopTech has developed BMW-specific balanced brake upgrades. The company was founded on the belief that the off-the-shelf, "parts bin" approach to BMW brake upgrades rarely gave the the best performance results. A true measured and engineered design for each BMW chassis was the only way to properly advance braking technology.

StopTech engineers evaluate each BMW model's hydraulic system, brake master cylinder size, weight transfer under braking, tire contact patch, and other factors to properly proportion braking torque. Too much braking torque from a poorly-designed system, or re-purposing off-the-shelf parts, could produce sub-optimal results, such as too much distribution to the front axle (or too little). Balancing brake distribution so that all four tires are doing the stopping is hugely beneficial to stopping performance. Every StopTech Big Brake Kit employs this Balanced Brake Upgrade(R).



On this page you will find specific information on StopTech Brakes for your BMW, including wheel fitment guides.



StopTech BMW Big Brake Kit In Detail

What components make up a Big Brake Kit?


StopTech Caliper
StopTech BBK Calipers
StopTech produces 2-piston, 4-piston, and 6-piston calipers for BMW applications. Internal pistons are sized for each BMW chassis and intended use. This is the key to the Balanced Brake Upgrade(R) design. By varying piston sizes, StopTech engineers can set the proper brake distribution for maximum traction at all four tires. StopTech calipers are renowned in the industry as being the most rigid. StopTech two-piece calipers are stiffer than even some monoblock caliper designs. A stiffer caliper gives the driver more confidence by reducing flex, vibration, and noise. Less flex also means faster braking response and more even pad wear. StopTech calipers come in blue, black, silver,red, or yellow colors.

StopTech Aerorotor
StopTech BBK Rotors
StopTech rotors are so packed with innovations that they patented the design. Aerorotors flow more air and stay cooler than other Big Brake Kit rotors. The internal cooling vanes are specially shaped to to flow more efficiently. Rotors are offered as either slotted or cross-drilled and as bare cast iron or with an anti-corrosion zinc coating.

StopTech Pads
StopTech BBK Pads
StopTech Big Brake Kits come standard with a set of Sport pads. These pads are designed as an "aggressive" street compound with excellent initial bite, moderate torque, and low-moderate dust levels. Less-aggressive pads are also available for daily-driver street use. And there is also a wide range of race/track pads available for StopTech calipers.

StopTech Lines
StopTech BBK Stainless Brake Lines
Each StopTech Kit comes with two stainless brake lines (enough for one axle). Brake lines are model specific so they have the correct fittings and length for each BMW chassis. Stainless lines replace old and worn original rubber lines for better pedal feel and performance. StopTech lines feature an inner PTFE/Teflon liner that resists swelling and expansion under extreme pressures. The outside of the line has a abrasion-resistant PVC cover to keep dirt and debris from wedging itself in-between the stainless lines.

StopTech Brackets
StopTech BBK Brackets and Hardware
StopTech calipers are mounted with hardcoat anodized 6061-T6 billet aluminum brackets. Billet aluminum brackets are model-specific for proper fitment and correct spacing. Stainless steel studs are used instead of bolts to ease caliper mounting and for additional rigidity. The hardcoat is tougher than standard anodizing.




StopTech BMW BBK vs. Trophy Sport BBK vs. Trophy Race BBK

In addition to the standard Big Brake Kit, StopTech offers all of their BMW brake kits in Trophy Sport and Trophy Race spec. Trophy Kits feature lighter calipers and rotors, a dark grey hard-anodized finish, and different rotor hardware. Trophy Sport kits are intended for street use, however, Trophy Race kits are only sold for racing/track use. There is no benefit to using these racing brakes on the street - in fact, the opposite is true. The Trophy Race kits do not have caliper dust seals as an extra layer of protection for the pistons. They will also be noisier due to the elimination of anti-rattle rotor hardware. If you have any questions on which StopTech Brakes will work best for you, give us a call or e-mail.

Standard ST40 kit

Trophy ST40R kit





StopTech Rotor Coatings - Standard vs. Zinc

The rotor rings in StopTech big brake kits are offered in slotted or cross-drilled patterns and with an anti-corrosion zinc coating or as plain cast iron. The zinc plating offers excellent protection from rust, especially when used with semi-metallic brake pads. StopTech coats the entire rotor in Zinc for 100% corrosion protection, even in the vanes. The actual friction surface is coated but will wear as the pads are bedded-in. The standard cast iron rotors will show rust on parts that are not swept by the brake pad, except on the rotor hat which is anodized black aluminum. Cleaning tip: do not use brake cleaner or harsh wheel cleaners near your zinc rotors as the strength of these chemicals will ruin the zinc finish.

Standard uncoated rotor

Zinc coated rotor





StopTech Replacement Rotors

One of the key advantages of a true big brake upgrade for BMW is that the rotor friction surface can be replaced. When the rotors wear out and are below their minimum thickness you can order a new ring. You won't have to buy a new ring, hat, and hardware like on some other kits. This helps keep consumable costs down. You can even change to a new rotor style as long as the rotor size stays the same. StopTech rotor rings come with new hardware and instructions. Unbolt the hat from your old ring and transfer it to the new disc with the new hardware. The new assembled rotor is ready to be installed. Follow the pad manufacturer's instructions for bedding in the pads. Click here for replacement rotors for StopTech Big Brake Kits





BMW StopTech Fitment Info

Every StopTech BBK has been engineered for the specific model and chassis. Installation and clearance to the suspension and chassis is guaranteed for the models listed. However, BBK do not fit all wheel designs and sizes. To ensure proper clearance between the new brakes and your wheel, StopTech produces these fitment guides.

As a general rule, StopTech Big Brake Kits fit within these wheel diameters -
  • 328mm rotor (12.9") = requires 17" wheel minimum
  • 332mm rotor (13.1") = requires 17" wheel minimum
  • 355mm rotor (14.0") = requires 18" wheel minimum
  • 380mm rotor (15.0") = requires 19" wheel minimum
  • However, wheel diameter is only one factor in BBK fitment. Wheel spoke design, wheel offset, and inner barrel dimensions are just as important.

    The guides below have the outline of the vehicle-specific caliper and rotor combination. To use these guides:
    1. Print out the guide on card stock or thicker paper,
    2. Cut the outline of the brakes,
    3. Place the guide on the inside of your wheel.
    Any interference with the wheel spoke will require wheel spacers. If the fitment outline touches the inside barrel of the wheel, a larger diameter wheel may be required.



    BMW E36 Non-M StopTech Brakes Info


    Front E36 StopTech Touring BBK
    Fitment Diagram

    Front E36 StopTech 332mm BBK
    Fitment Diagram

    Rear E36 StopTech 328mm BBK
    Fitment Diagram





    BMW E36 M3 StopTech Brakes Info


    Front E36 M3 StopTech 332mm BBK
    Fitment Diagram

    Front E36 M3 StopTech 355mm BBK
    Fitment Diagram

    Rear E36 M3 StopTech 332mm BBK
    Fitment Diagram





    E39 540i StopTech Brakes Info


    Front E39 540i StopTech 355mm ST40 BBK
    Fitment Diagram

    Front E39 540i StopTech 355mm ST40 BBK
    Fitment Diagram

    Rear E39 540i StopTech 345mm ST22 BBK
    Fitment Diagram

    Rear E39 540i StopTech 355mm ST40 BBK
    Fitment Diagram




    E39 M5 StopTech Brakes Info


    Front E39 M5 StopTech 355mm ST40 BBK
    Fitment Diagram

    Front E39 M5 StopTech 355mm ST60 BBK
    Fitment Diagram

    Rear E39 M5 StopTech 345mm ST22 BBK
    Fitment Diagram

    Rear E39 M5 StopTech 355mm ST40 BBK
    Fitment Diagram




    E46 323i/325i/328i StopTech Brakes Info


    Front E46 StopTech 325mm Touring BBK
    Fitment Diagram

    Front E46 StopTech 332mm BBK
    Fitment Diagram

    Rear E46 StopTech 328mm BBK
    Fitment Diagram


    E46 330i StopTech Brakes Info


    Front E46 330i StopTech 332mm BBK
    Fitment Diagram




    E46 M3 (non-ZCP) StopTech Brakes Info


    Front E46 M3 StopTech 332mm BBK
    Fitment Diagram

    Front E46 M3 StopTech 355mm ST40 BBK
    Fitment Diagram

    Front E46 M3 StopTech 355mm ST60 BBK
    Fitment Diagram

    Front E46 M3 380mm BBK
    Fitment Diagram

    Rear E46 M3 StopTech 345mm BBK
    Fitment Diagram

    Rear E46 M3 StopTech 355mm BBK
    Fitment Diagram




    E46 M3 ZCP Competition Package StopTech Brakes Info


    Front E46 M3 ZCP StopTech 355mm ST40 BBK
    Fitment Diagram

    Front E46 M3 ZCP StopTech 355mm ST60 BBK
    Fitment Diagram

    Front E46 M3 ZCP StopTech 380mm BBK
    Fitment Diagram

    Rear E46 M3 ZCP StopTech 355mm BBK
    Fitment Diagram




    E53 X5 (all) StopTech Brakes Info


    Front E53 X5 3.0 StopTech 355x32mm BBK
    Fitment Diagram

    Front E53 X5 3.0 StopTech 355x35mm BBK
    Fitment Diagram




    E60 525i/528i/530i StopTech Brakes Info


    Front E60 StopTech 380mm BBK
    Fitment Diagram

    Rear E60 StopTech 355mm BBK
    Fitment Diagram




    E60 535i/545i/550i StopTech Brakes Info


    Front E60 535i/545i/550i StopTech 380mm BBK
    Fitment Diagram

    Rear E60 535i/545i/550i StopTech 355mm BBK
    Fitment Diagram




    E63 645ci/650i StopTech Brakes Info


    Front E63 645ci/650i StopTech 380mm BBK
    Fitment Diagram

    Rear E63 645ci/650i StopTech 355mm BBK
    Fitment Diagram




    E70 X5 3.0si/35Xi StopTech Brakes Info


    Front E70 X5 3.0si/35Xi Stoptech 380mm BBK
    Fitment Diagram

    Rear E70 X5 3.0si/35Xi StopTech 380mm BBK
    Fitment Diagram




    E71 X6 35i StopTech Brakes Info


    Front E71 X6 35i Stoptech 380mm BBK
    Fitment Diagram

    Rear E71 X6 35i StopTech 380mm BBK
    Fitment Diagram




    E85/E86 Z4 Non-M StopTech Brakes Info


    Front E85 Z4 StopTech 325mm Touring BBK
    Fitment Diagram

    Front E85 Z4 StopTech 328mm BBK
    Fitment Diagram

    Front E85 Z4 StopTech 332mm BBK
    Fitment Diagram




    E85/E86 Z4M StopTech Brakes Info


    Front E85/E86 Z4M StopTech 355mm Touring BBK
    Fitment Diagram

    Front E85/E86 Z4M StopTech 355mm ST40 BBK
    Fitment Diagram

    Front E85/E86 Z4M StopTech 355mm ST60 BBK
    Fitment Diagram

    Front E85/E86 Z4M StopTech 380mm BBK
    Fitment Diagram

    Rear E85/E86 Z4M StopTech 355mm BBK
    Fitment Diagram




    E9X 325i/328i 06-07 StopTech Brakes Info


    Front E9X 325i/328i StopTech 355mm BBK
    Fitment Diagram

    Rear E9X 325i/328i StopTech 345mm BBK
    Fitment Diagram




    E9X 328i 08-13 StopTech Brakes Info


    Front E9X 328i StopTech 355mm BBK
    Fitment Diagram

    Rear E9X 328i StopTech 345mm BBK
    Fitment Diagram




    E9X 328xi 08-13 StopTech Brakes Info


    Front E9X 328xi StopTech 355mm BBK
    Fitment Diagram

    Rear E9X 328i StopTech 345mm BBK
    Fitment Diagram




    E90 330i StopTech Brakes Info


    Front E90 330i StopTech 355mm BBK
    Fitment Diagram




    E9X 335i StopTech Brakes Info


    Front E9X 335i StopTech 355mm BBK
    Fitment Diagram

    Rear E9X 335i StopTech 345mm BBK
    Fitment Diagram




    E9X M3 StopTech Brakes Info


    Front E9X M3 StopTech 355mm BBK
    Fitment Diagram

    Front E9X M3 StopTech 380mm BBK
    Fitment Diagram

    Rear E9X M3 StopTech 355mm BBK
    Fitment Diagram




    F10 535i/550i StopTech Brakes Info


    Front F10 535i/550i StopTech 380mm BBK
    Fitment Diagram




    F12/F13 640i/650i StopTech Brakes Info


    Front F12/F13 640i/650i StopTech 380mm BBK
    Fitment Diagram




    F22 228i, F3X 328i/428i StopTech Brakes Info


    Front F22 228i, F3X 328i/428i StopTech 355mm BBK
    Fitment Diagram

    Rear F22 228i, F3X 328i/428i StopTech 345mm BBK
    Fitment Diagram

    Front F22 228i M Sport, F3X 328i/428i M Sport
    StopTech 355mm BBK
    Fitment Diagram

    Front F22 228i M Sport, F3X 328i/428i M Sport
    StopTech 380mm BBK
    Fitment Diagram

    Rear F22 228i M Sport, F3X 328i/428i M Sport
    StopTech 345mm BBK
    Fitment Diagram




    F22 M235i, F3X 335i/435i StopTech Brakes Info


    Front M235i/335i/435i StopTech 355mm BBK
    Fitment Diagram

    Front M235i/335i/435i StopTech 380mm BBK
    Fitment Diagram

    Rear M235i/335i/435i StopTech 355mm BBK
    Fitment Diagram




    F3X 335i/435i M Sport S2NHA StopTech Brakes Info


    Front F3X 335i/435i M Sport S2NHA StopTech 380mm BBK
    Fitment Diagram (same as E9X 335).

    Rear F3X 335i/435i M Sport S2NHA StopTech 355mm BBK
    Fitment Diagram.




    F8X M3/M4 StopTech Brakes Info


    Front F8X M3/M4 StopTech 380mm BBK
    Fitment Diagram

    Rear F8X M3/M4 StopTech 355mm BBK
    Fitment Diagram




    Related Brake Upgrades and Accessories:


    Brake Fluid

    BBK Brake Pads

    Brake Bleeding Tool

     

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