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StopTech BBK - FRONT - 13/332mm/32mm ST-40 4-piston - BMW 330i (e46) - not for Xi

StopTech BBK - FRONT - 13/332mm/32mm ST-40 4-piston - BMW 330i (e46) - not for Xi
Part#: 83-148-4600

List Price: $2,495.00
Your Price: $2,295.00

Inventory: In Stock

BMW Platform - Chassis E and F codes BMW Paint Codes BeastPower Help
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Caliper Color:
Blue (+$200)
Gold (+$200)
Yellow (+$200)
Rotor Type:
Cross Drilled (+$100)
Gold Zinc Rotor Coating?:
Yes (+$70)

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StopTech BBK - FRONT - 13/332mm/32mm ST-40 4-piston - BMW 330i (e46) - not for Xi

StopTech Big Brake Kits (BBKs) give your BMW that Supercar look and feel, and exceed stock performance in two areas. First, larger rotors increase heat capacity. Second, stiffer calipers and stainless steel lines reduce system compliance.

The key, however, is to increase heat capacity and reduce compliance without upsetting the stock front to rear brake torque ratio. If the brake upgrade you select adds too much front torque (as many do), you reduce your BMW's ability to utilize the tractive capacity of all of the tires to the maximum practical extent (even on ABS equipped BMWs) and you therefore create performance sacrifices. In addition, too many pistons or pistons that are too large will make the brake pedal much more difficult to modulate, which limits a driver's control of brake input on the race track.

Advantages of StopTech over other brake upgrades:

  • Shorter Stopping Distances
  • Better Brake Modulation
  • Firmer Brake Pedal
  • Less Brake Fade

M3 (e46) BBK shown in above photo

Feature Benefit Summary:

  • Balanced Brake Upgrades with optimum brake bias offer the shortest stopping distance with the best pedal feel.
  • StopTech's patented AeroRotors with the best airflow available result in better cooling, less fade and longer rotor and pad life.
  • The stiffest aftermarket calipers with patented bridge result in better clamping under hard braking and less pad taper.
  • Track testing of new applications ensures optimum performance.

Caliper Descriptions:

    • Fully forged aluminum construction
    • Patented, bolt-in bridge minimizes caliper compliance for a firmer pedal
    • Stiffest 6-piston caliper currently on the market
    • Uses standard FMSI D1247 pad
    • Can be used on rotors with outer diameter of 328-380mm and thickness of 28-35mm
    • ALL finished parts are 100% leak down and pressure tested to 2500 PSI
    • Uses a popular pad shape readily available in over 15 street performance and race friction compounds
    • Over 19 different piston size combinations available to tune brake torque to the needs of each individual application
    • Differential piston sizes minimize pad taper for longer pad life and a firmer pedal
    • Dust boots are standard for reduced maintenance
    ST-40 and ST-45:
    • Fully forged aluminum construction
    • ALL finished parts are 100% leak down and pressure tested to 2500 PSI
    • ST-40 uses standard FMSI D372 pad
    • ST-45 uses standard FMSI D609 pad
    • Any combination of eight piston sizes available to match kit to your BMW's application
    • Differential piston sizes minimize pad taper
    • Dust boots are standard
    • Weight: 7.94 lb (3.6 kg) unloaded
    • Same caliper used by top Speed® World Challenge and Grand-Am Cup Teams
    • Fully forged aluminum construction
    • All finished parts are 100% tested to a pressure of 2500 PSI
    • Uses standard FMSI D961 Pad
    • 2-piston opposed design
    • Can be added to BMWs with existing front StopTech kits
    • Piston size adjusted for the application, just like StopTech's front calipers
    • Dust boots are standard
    • Weight: 4.4 lb (2 kg) unloaded

Improved cooling and heat capacity means less fade:
StopTech has incorporated several design innovations to improve rotor airflow, cooling and heat capacity. The ability to absorb and dissipate heat is essential to brake system performance.

Benefits of Improved Airflow:

  • Less fade
  • Longer rotor and pad life
  • Better performance

StopTech's patented AeroRotor® features curved vanes with innovations on leading and trailing edges. The uniquely designed vanes inside the disc optimize airflow through the rotor. This improved directional design minimizes turbulence and flows more air than any rotor tested. The result is up to 80% better airflow over original equipment rotors and 10-30% better airflow than directional vaned racing rotors currently available.

Outer rotor faces run hotter. The patent pending AeroHat has directional stand offs between the rotor and mounting bell (hat) that increase airflow to the outside faces of the rotor by 50-100%. Increased airflow reduces the temperature difference between the inside and outside faces of the rotor resulting in less distortion and better performance compared to other fully floating designs. Outer pad wear is reduced. AeroHat improves entire brake system airflow by up to 4%.

The below chart shows that StopTech (top red line) has the highest induced airflow of any rotor tested. Leading aftermarket and original equipment rotors were tested for airflow from 30mph to 150mph. AeroRotor® dramatically outperformed all other rotors, with improvements from an impressive 11% to a staggering 80% increase in airflow (corrected to 20°C and sea level.)

Using finite element analysis (FEA) modeling software, StopTech have designed a bolt-in bridge strong enough to stop distortion without sacrificing cooling through the top of the caliper. Distortion is virtually eliminated. The fully forged StopTech ST-40 caliper has the least flex of any tested aftermarket and OE caliper. The air channel in the bridge is designed to help air flow through the retainer, resulting in better cooling.

Benefits of Stiffer Calipers:

  • Better performance with less vibration, noise and pad taper
  • Better pedal feel under extreme braking conditions
  • No radial pad taper

Caliper Deflection:
The chart below shows the results of testing 25 leading caliper models by the major caliper companies. Each caliper was subjected to the same pressures and deflection was measured with a dial caliper. StopTech's is the stiffest caliper of the major brands tested.

What’s included?:

  • Calipers
  • 2-piece floating directional AeroRotors with hats (pre-assembled
  • Stainless steel brake lines
  • Caliper mounting brackets
  • Street performance pads

Caliper Color Options:
Calipers are available in the following colors:

Blue, gold and yellow calipers have a 30-45 day lead time and are $200 extra per axle.Silver calipers are available at no extra charge, but do have a 30-45 day lead time.

Rotors are available slotted, drilled or plain. Drilled rotors are $100 extra per axle.

StopTech now offers an anti-corrosion gold zinc coating for all AeroRotors. The coating benefits customers who live in cold climates where snow and road salt are commonly encountered, and customers who would prefer to not have visible surface rust on the vanes and outer circumference of their rotors. Zinc coating does not have a negative environmental impact like other coatings. Gold zinc coating costs $70 per axle extra.

Standard Pads:
The performance pads included with kits are suitable for both street and light track use such as Autocross (1 lap at a time). For more aggressive track use or race use, it is very important to select pads appropriate to the type of driving. The manufacturers below all make pads to fit StopTech calipers. Please contact us, or review the compound descriptions in the brake pad section of the BeastPower website, to help you select appropriate street, track day or race pads.

StopTech = Quality:
StopTech is a serious company that puts great emphasis on quality materials and suppliers. The high standard of StopTech's parts and manufacturing processes are part of what makes StopTech brakes the best value in the market today.

StopTech's ST-40 and ST-60 calipers are fully forged for optimal strength and light weight. All caliper finish machining (such as piston bores sized correctly for the application) and assembly/testing is done in StopTech's Southern California facility. StopTech tests every single finished caliper to 2800 psi using brake fluid on a special test bench designed by StopTech engineers.

AeroRotors are made using StopTech's patented vane design and StopTech's proprietary cast iron formula, which was specified with durability in mind. StopTech has had several sets of rotors run entire 24 hour races on winning cars. StopTech did extensive testing before settling on StopTech's final top-secret formula. To test rotor durability, StopTech rented the California Speedway and ran a heavily weighted down car with StopTech rotors on one side and a competitor's rotors on the other. In this test, StopTech rotors were approximately twice as durable as the competitive rotor.

Hats and Brackets:
StopTech's hats and brackets are made with a special type of billet aluminum that was designed for the AeroSpace industry in the United States. The German TÜV were so impressed with the durability of these parts during testing that they replicated the bracket and repeated the test with a steel imitation of StopTech's part. The steel version failed early.

Hats and brackets are machined to ISO standards at StopTech's manufacturing facility in Torrance, California, using the latest CNC machines that feature active tooling.

Stainless Steel Brake Lines:
StopTech makes StopTech's own stainless steel brake lines in Southern California. StopTech is a DOT (U.S. Department of Transportation) registered supplier of Stainless Steel Brake Lines. Line material and fittings are all made from the highest quality parts available. Lines feature a clear abrasion-resistant cover for maximum protection against chaffing. Necessary quality control procedures are in place to ensure lines are the correct length, etc. Every fully assembled StopTech Stainless Steel Brake Line is tested to a pressure of 4,500 PSI.

Quality Assurance of Parts:
All parts are bench tested prior to shipment. Each caliper is 100% pressure tested to 2,500 PSI. Every brake line is 100% pressure tested to 4,500 PSI. Every assembled two-piece rotor is tested for runout. Hats and brackets are made by StopTech to exacting standards on StopTech's own CNC machines. Since StopTech has complete control over their entire design and manufacturing process, they are able to deliver completely integrated kits with a very high standard of quality.

StopTech was the first aftermarket brake upgrade company to offer Balanced Brake Upgrades and is the only company offering optimized kits for over 277 applications. To StopTech's knowledge, no other brake upgrade manufacturer takes these design and test steps.

Wheel Fitment:
Most cars require upgraded wheels to fit over a big brake kit, but some kits do fit in stock wheels. General guidelines for wheel fitment are below, but more important than the diameter of the wheel is the space between the face of the caliper and the inside of the wheel spokes. Wheel width and offset have nothing to do with this clearance area. Clearance is strictly a function of the spoke design. Even if the diameter of your wheel is sufficient, StopTech still recommend that you check fitment.

Easy-to-use templates and instructions on how to use them are available from BeastPower upon request. These templates will allow you to accurately test fit any wheel. Be sure you check wheel fitment before committing to a wheel set.

    Kits usually require these minimum wheel diameters:
    • 328mm rotor (12.9 inches) - 17 inch wheel
    • 332mm rotor (13 inches) - 17 inch wheel
    • 355mm rotor (14 inches) - 18 inch wheel
    • 380mm rotor (15 inches) - 19 inch wheel

Checking wheel fitment is the responsibility of the customer.

About StopTech:
StopTech was founded in March of 1999 with a singular mission: Become the leading manufacturer and supplier of high-performance brake components and systems. United by their passion for racing and high-performance vehicles, the founding staff sought to challenge the status quo in brake technology and set new paradigms for brake upgrades. In service of this mission, and as a direct result of the company's ongoing brake research, StopTech has received three patents in brake technology and has one patent pending.

StopTech is the first brake upgrade manufacturer to build its business around the concept of Balanced Brake Upgrades® for stock and production racecars running a single master cylinder, and was the first to use track testing as an integral part of its application development process. Prior to the inception of StopTech, brake upgrade manufacturers used what they had in their parts bins to build brake upgrades. These early brake upgrades were often too front-biased, causing "upgraded" vehicles to perform worse than their stock counterparts in stopping distance tests. StopTech was the first aftermarket brake upgrade company to design and manufacture balanced front brake upgrades to improve all aspects of performance, while maintaining compatibility with the original equipment (OE) rear brakes. StopTech prides itself in maintaining compatibility with all onboard vehicle dynamic control systems, such as ABS, stability control, traction control, and dynamic rear proportioning systems. The same principles of balance and compatibility are applied to the company's four-wheel brake upgrade kits. StopTech achieves the technically ideal balance by engineering brake systems with proper front-to-rear brake bias on a per-platform basis. Other StopTech performance paradigms include caliper stiffness, rotor cooling and durability, and OE-like serviceability.

With approximately 450 big brake kit applications and dealers in 27 countries, StopTech is now the worldwide leader in Balanced Brake Upgrades for production cars. Illustrating this point, StopTech-equipped cars consistently win braking contests performed by independent publications, such as Car and Driver and Sport Compact Car. The StopTech-equipped Turner Motorsport BMW driven by Bill Auberlen won the 2004 SPEED World Challenge® Touring Car series championship. This was followed up in 2005 with StopTech's racing partners claiming six poles, four wins and 11 podium finishes in Touring Car. In Grand-Am® Cup Grand Sport class in 2005, StopTech-equipped cars won six of eleven races. StopTech supported professional race victories have been achieved with the same products sold to the public.

StopTech's ST-40 and ST-60 calipers are manufactured using a squeeze-forging process, and StopTech ST-22 calipers are forged in Southern California. StopTech's AeroRotors are manufactured from cast iron that has been shown to meet the highest standards for crack resistance. Side-by-side testing has shown StopTech AeroRotors to be approximately twice as crack-resistant as a leading competitor's rotor. All finish machining of calipers, as well as machining of hats and brackets from billet, is carried out at StopTech's headquarters in Southern California, using the latest CNC equipment.

StopTech products meet all applicable standards for quality and performance worldwide. StopTech has received the prestigious TÜV approval in Germany for a number of its products. StopTech has also been selected as a brake system supplier by major OE aftermarket divisions and tuners operating as vehicle constructors, meeting U.S. FMVSS and DOT standards.

StopTech BBK - FRONT - 13/332mm/32mm ST-40 4-piston - BMW 330i (e46) - not for Xi

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