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RB 4 Pot BBK (380x32) for BMW 335i (E9X), 135i Front
Big Brake Kit - BMW 335i (E90-E93) Front 380x32mm
This product photo is for reference only.
MSRP: $3,200.00
Sale Price: $2,880.00
You save $320.00!

Price with Selected Options: $2,880.00
Note: 2229-K
Size: 380x32mm (OE is 348x30)
Rotor Wt (lbs.): 22.8

Product Code: 2229K

10% off RB brake pads:

XR70 (PD1149-XR70) [Add $197.10]

Learn why RB Aluminum caliper kits are different from others.

This kit includes:

  • 2 Two-piece center-mount rotors
  • 2 4-Piston calipers
  • 2 Aluminum adapters
  • 1 Set of front stainless steel braided brake lines
  • 1 Set of RB ET brake pads

Due to the large variety of available wheels we recommend checking your wheel clearance with our kit prior to installation. Click here to download the wheel fitment template for this kit.

Replacement Components:
Rotor Ring: D501-01-381
Pad: D1149
Two-piece rotor:
  • True floating two-piece rotors with patent pending center-mount design.
  • Direct bolt on, easy to install.
  • Alloyed iron formula adds strength and heat resistance. Heat treated for a more uniform microstructure and ultimate performance.
  • EDP Coating w/cross cut grinding on friction surface.


- Caliper Body: Made of forged 6061-T6. Light weight calipers are re-designed and built for the toughest brake jobs with extended service life before any rebuild is required.

- Low Profile: Together with RB Center-Mount design two-piece rotors, you hardly even need to require a spacer to install the kit.

- Pistons: Caliper pistons are 40mm and 44mm diameter (two of each). Pistons are made of stainless steel instead of aluminum commonly used by other caliper mfgrs which can substantially reduce the heat transfer (approx 1/10 of aluminum) from the pad to brake fluid. Pistons are vented to further reduce the heat contact area and improve air circulation thereby reducing more heat transfer.

- Dust Seal: Our dust seal is of built-in type (instead of external boot type) uniquely designed to shield the dust and foreign material from contamination and will not rip - as commonly seen on boot type dust seals.Piston

- Hardware: Brake pad pins and banjo connections were re-designed for easier brake line connection and brake pad replacement.

- Surface Coating: Powder coating with most durable finish for lasting appeal. Available colors are red and blue.

- Hardware: Most hardware is made of stainless steel for durable performance and appearance.

- Never Get Lost Bleeder Cap: Newly designed with a retaining loop so you will never have to find it again and/replace the lost ones. (made of durable EPDM)Piston

- Use standard FMSI brake pads (D1149): A very common P/N

- Made in USA: Calipers are designed, fully assembled and hydro-tested in our Fullerton, CA facility, with full after sales support/service.

Rotor Design:

Our unique and patented rotor designs make our discs cooler and last longer.

  1. Convergent vane design

    The cooling vanes are of a convergent nozzle design, which increases airflow and turbulence and makes discs cooler. (Illustration #1)

  2. Center-mount design

    The center-mount flanges for hat mounting to the rotor ring have several benefits. (Illustration #2)
    • It allows the ring to be used on either side of the vehicle simply by mounting the hat on either side of the ring (unidirectional).
    • The stress load transferred from the ring to the hat is balanced.
    • Air inlets are widely open to both inboard and outboard sides of the rotor. More air suctions and even temperature on both sides of the disc surface.
    • Heat transfer from the disc surfaces to the hat is even and minimized by increasing the flange length and the airflow around the flanges.
    • Mounting flanges are on both friction surfaces ultimately provides excellent heat balance.
  3. True floating design

    Exclusive full floating design with 10.9 grade alloyed hardware. Hardware is DACRO coated and crimp locking. DACRO is highly corrosion resistant and provides a film for easier movement between the hat and rotor ring as disc expands and contracts and the crimp design provides positive engagement without rattling or torque loss at temperature.

Related Links:

Feature Comparison Two-piece Rotor
Two-piece Disc Surface Finish

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