ENDLESS M4 / S2 FRONT & REAR BIG BRAKE KIT WITH 326MM 1-PIECE ROTORS FOR SCION FR-S [1902951-326]
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Endless M4 / S2 Front & Rear Big Brake Kit with 326mm 1-Piece Rotors for Scion FR-S [1902951-326]
The Endless M4 / S2 is a complete FR-S big brake kit for the 2013-2016 Scion FR-S, pairing four-piston M4 front calipers and two-piston S2 rear calipers with 326mm x 30mm one-piece slit rotors up front and 316mm rotors at the rear, performance pads, caliper mounting brackets, and brake lines for the front and rear axles. Both axles get matched Endless calipers so bias, pedal feel, and pad character stay consistent front to rear. 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 and rear kit in the Endless blue anodize caliper finish.
Features
- Matched Endless M4 front and S2 rear calipers keep brake bias and pedal feel consistent across both axles
- Full-car brake solution in one part number, engineered together rather than pieced from separate kits
- Slit rotor face continuously refreshes the pad surface and vents gas without the cracking risk of cross-drilled discs
- Complete dual-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 FR-S big brake kit that moves between street and circuit duty on a pad change
Specifications
- Front Caliper: Endless M4 (EC4104), four pistons
- Rear Caliper: Endless S2 (EC201 / EC202), two pistons, 1,500g each
- Caliper Finish: Endless blue anodize
- Supported Compounds: SSM, TR, MX72, MX72 Plus
- Rotor Size (Front): 326mm x 30mm
- Rotor Size (Rear): 316mm x 20mm
- Rotor Construction: One-piece, slit face
- Kit Contents: Endless Racing Calipers (4); Brake Pad Set – Front; Brake Pad Set – Rear; Caliper Mounting Bracket (4); Brake Rotors (4) – 326mm x 30mm; Brake Lines (4)
- Part Number: 1902951-326 (Endless Japan reference ECJXZN6)
- Position: Front & Rear
Applications
- Scion FR-S: 2013-2016
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 both axles as a matched system.
- Sold as a complete front and rear brake system (all four corners).
Frequently Asked Questions
- Will this FR-S big brake kit clear my wheels? Clearance depends on wheel design, not just diameter. This kit runs 326mm x 30mm rotors. 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 1902951-326 kit? The kit includes Endless M4 front calipers, S2 rear calipers, brake pad sets, mounting brackets, rotors for both axles, and brake lines. It is a complete front and rear system for the Scion FR-S under one part number.
- Why choose a front and rear kit over a front-only upgrade? A matched front and rear system like this Endless M4 / S2 kit keeps brake bias close to the engineered balance as outright grip rises. Front-only upgrades work well for street use, but dual-axle kits keep the car neutral under hard, repeated braking on circuit.
- What pad compounds work with the Endless M4 / S2 calipers? Endless supports its street-through-track pad compound range, including MX72 and MX72 Plus, across these calipers, so the same fr-s big brake kit covers daily driving and circuit days on a pad change. Contact Bulletproof Automotive for the current compound lineup.
- Is this kit a direct bolt-on? Yes. Part number 1902951-326 ships with mounting brackets and brake lines for the 2013-2016 Scion FR-S, 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 1902951-326 is sold as one complete front and rear brake system covering all four 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
- Materials and finishes are selected for both durability and visual appeal
- 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 / S2 FRONT & REAR BIG BRAKE KIT WITH 326MM 1-PIECE ROTORS FOR SCION FR-S [1902951-326]
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