ENDLESS M4 FRONT BIG BRAKE KIT WITH 326MM 1-PIECE ROTORS FOR SUBARU IMPREZA WRX STI GRB *BREMBO PCD114.3 [1913069]
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Endless M4 Front Big Brake Kit with 326mm 1-Piece Rotors for Subaru Impreza WRX STI GRB *Brembo PCD114.3 [1913069]
The Endless M4 is a complete Impreza WRX big brake kit for the 2008-2012 Subaru Impreza WRX STI GRB *Brembo PCD114.3, pairing forged two-piece four-piston calipers with 326mm x 30mm one-piece slit rotors, performance pads, caliper mounting brackets, and brake lines for the front axle. The M4 body is a forged two-piece design with 34mm and 41mm piston sizing that loads the pad evenly. The rotors carry the Endless slit face that keeps the pad surface clean and friction stable as heat builds. Every component is designed and manufactured in Japan by Endless. Supplied as a complete front-axle kit in the Endless blue anodize caliper finish.
Features
- Forged Endless M4 calipers with paired piston sizing for even pad pressure and a firm, consistent pedal
- Slit rotor face continuously refreshes the pad surface and vents gas without the cracking risk of cross-drilled discs
- Complete single-axle system: calipers, pads, brackets, rotors, and lines under one part number
- Direct bolt-on installation with the included mounting brackets
- Machined to Endless production standards with surface accuracy held to 1/1000mm
- A Impreza WRX big brake kit that moves between street and circuit duty on a pad change
Specifications
- Caliper: Endless M4 (EC4104), forged two-piece, four pistons
- Piston Sizes: 34mm and 41mm pairs
- Caliper Finish: Endless blue anodize
- Pads: 15mm thickness, RCP093 shapes
- Supported Compounds: SSM, TR, MX72, MX72 Plus
- Rotor Size: 326mm x 30mm
- Rotor Construction: One-piece, slit face
- Minimum Wheel Size: 17 inch (verify by wheel design)
- Kit Contents: Endless Racing Calipers (2); Brake Pad Set; Caliper Mounting Bracket (2); Brake Rotors (2); Brake Lines (2)
- Part Number: 1913069 (Endless Japan reference EC4SGRB)
- Position: Front
Applications
- Subaru Impreza WRX STI GRB *Brembo PCD114.3: 2008-2012
Notes
- Verify wheel clearance before ordering; Endless publishes wheel clearance diagrams and Bulletproof Automotive will confirm fitment against your wheel specs.
- Bed the pads in dry conditions; bedding in rain prevents the pads from reaching full performance.
- This kit services the front axle only; the factory rear brakes are retained.
- Sold as a complete front brake kit (one axle, both corners).
Frequently Asked Questions
- Will this Impreza WRX big brake kit clear my wheels? Clearance depends on wheel design, not just diameter. This kit runs 326mm x 30mm rotors and the Endless M4 caliper is sized for wheels from 17 inches. Endless publishes wheel clearance data for its kits; contact Bulletproof Automotive with your wheel specs before ordering and we will confirm fitment.
- What is included in the Endless 1913069 kit? The kit includes two Endless M4 calipers, a brake pad set, two caliper mounting brackets, two 326mm x 30mm one-piece rotors, and two brake lines. It is a complete front-axle system for the Subaru Impreza WRX STI GRB *Brembo PCD114.3 under one part number.
- Do I need to upgrade the rear brakes at the same time? No. The Endless M4 front kit installs with the factory rear brakes retained. The front axle carries most of the braking load, so a front system is the standard first upgrade and works as a standalone improvement.
- What pad compounds work with the Endless M4 calipers? The Endless M4 runs 15mm-thick pads in the RCP093 shapes. Endless supports its SSM, TR, MX72, MX72 Plus compounds in this caliper, so the same impreza wrx big brake kit covers street driving through track use on a pad change.
- Is this kit a direct bolt-on? Yes. Part number 1913069 ships with mounting brackets and brake lines for the 2008-2012 Subaru Impreza WRX STI GRB *Brembo PCD114.3 front axle, so the kit bolts on without fabrication. Bed the pads in dry conditions after installation to reach full performance.
- How is the kit sold? Part number 1913069 is sold as one complete front brake kit covering both front corners: calipers, rotors, pads, brackets, and lines, priced and shipped as a single system.
About Endless
Endless is a Japanese brake manufacturer that designs everything in-house and manufactures domestically in Japan, holding surface accuracy to 1/1000mm under strict quality control. The company developed its own laminated sintered wire-mesh backing plate and ceramic carbon rotors, and it proves its parts in competition, running its own factory motorsport program and supplying winning teams across Japanese and European racing. From pads and slit rotors to forged and monobloc calipers, brake fluid, and lines, Endless builds braking systems trusted on both street and circuit.
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- Please review the product dimensions carefully to ensure the right fit for your space
- Color may vary slightly due to lighting and screen settings
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- Some items may require simple assembly upon delivery
- Perfect for both everyday use and long-term comfort
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Product Size Guide
Please refer to the general size reference below to better understand how this product may fit into your space. Dimensions may vary slightly depending on the design and materials.
| Category | Small | Medium | Large |
|---|---|---|---|
| Decor & Accessories | Up to 10″ | 10″ – 20″ | 20″+ |
| Tables | Up to 30″ | 30″ – 60″ | 60″+ |
| Seating | 1 Seater | 2–3 Seater | 4+ Seater |
| Storage Units | Compact | Standard | Large Capacity |
| Lighting | Small Fixture | Standard Fixture | Large Fixture |
Note: For exact product dimensions, please refer to the specifications section above. This guide is intended as a general reference only.
ENDLESS M4 FRONT BIG BRAKE KIT WITH 326MM 1-PIECE ROTORS FOR SUBARU IMPREZA WRX STI GRB *BREMBO PCD114.3 [1913069]
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