Project Mu FS44S Forged 4-Piston Slim Front Brake Kit (355mm 2-Piece Rotors) 2013+ FRS/BRZ/86 2022+ BRZ/GR86
Regular price
$3,495.00
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OVERVIEW
Combine high-output multi-piston stopping power with maximum wheel clearance using the Project Mu FS44S Forged 4-Piston Slim Front Brake Kit for the 2022+ Toyota GR86, Subaru BRZ, and Toyota 86. Built with a slimmed caliper profile (140.2mm overall width), the FS44S is specifically engineered to eliminate wheel spoke interference commonly found on aggressive aftermarket and concave wheel fitments. Utilizing a unique 4-piston x 4-pad system, each piston acts independently on its own dedicated pad, ensuring uniform wear across the friction surface, eliminating pad taper, and producing instantaneous pedal response under heavy braking.
| Caliper Feature / Spec | FS4M Street 4POT (Kit FS4M-F103SP) | FS44S Sports 4POT (Kit FS44S-F103) | FS44S Sports 4POT (Kit FS44S-F103B) | FS44 Standard 4POT (Kit FS44-F103A) |
|---|---|---|---|---|
| Axle Position | Front Axle Specific | Front Axle Specific | Front Axle Specific | Front Axle Specific |
| Caliper Profile / Design | Slim Street Body (17" Wheel Friendly) | Slim Body (High Wheel Clearance) | Slim Body (High Wheel Clearance) | Standard Full-Size Forged Body |
| Piston / Pad Architecture | 4-Pistons x 2-Pads (Standard) | 4-Pistons x 4-Pads (1 Pad / Piston) | 4-Pistons x 4-Pads (1 Pad / Piston) | 4-Pistons x 4-Pads (1 Pad / Piston) |
| Rotor Spec / Design | 315mm x 30mm (1-Piece Round 6-Slit) | 332mm x 28mm (2-Piece Straight 8-Slit) | 355mm x 28mm (2-Piece Straight 8-Slit) | 345mm x 32mm (2-Piece Straight 8-Slit) |
| Target Application | Entry Street Upgrade / OEM 17" Wheels | High-Clearance Street & Track (17"/18") | High-Clearance Street & Track (18"+ Wheels) | Heavy-Duty Trackday & Circuit Use |
FEATURES
- Slim Caliper Architecture: Slimmed body design minimizes outer caliper protrusion, maximizing clearance with aftermarket concave spokes.
- 4-Piston x 4-Pad Technology: Equips each of the four 38mm pistons with an individual brake pad to prevent pad tapering, optimize heat distribution, and increase initial bite control.
- Forged Aluminum Body Construction: Forged aluminum alloy provides exceptional structural rigidity while resisting body flex under aggressive track loads.
- Massive 355mm 2-Piece Rotors: Oversized 355x28mm 2-piece floating rotors increase thermal heat capacity and braking torque over stock discs.
- Straight 8-Slit Rotor Venting: 8-slit pattern continuously cleans the brake pad face and vents out boundary layer gases during high-temperature braking.
- Iconic Project Mu Teal Finish: Features Project Mu's signature teal powder coating over a hard-anodized protective base coat for severe corrosion resistance.
WHAT IS INCLUDED
- 2x Project Mu FS44S Forged 4-Piston Slim Front Calipers (Signature Teal Powder Coat)
- 2x Project Mu 355mm x 28mm 2-Piece Front Brake Rotors (Straight 8-Slit)
- 8x Project Mu Performance Front Brake Pads (4 Pads per Caliper - Standard NS-C Compound)
- 2x CNC Machined Aluminum Caliper Mounting Brackets & Hardware
- 2x Stainless Steel Braided Brake Lines with Teflon Inner Core
- Pad Support Springs & Installation Bolt Kit
PART NUMBERS
- Manufacturer Part Number: FS44S-F103B
SPECIFICATIONS
- Position: Front Axle
- Caliper Type: Forged Aluminum 4-Piston Slim (FS44S)
- Piston Diameter: 38mm x 4
- Caliper Dimensions: Length: 282.8mm | Width: 140.2mm | Height: 72.3mm
- Rotor Dimensions: 355mm Diameter x 28mm Thickness (2-Piece Floating)
- Rotor Venting / Slits: Vented with Straight 8-Slit Pattern
- Standard Included Compound: Project Mu NS-C (Optional: TYPE PS or D1 spec ZERO)
- Finish: Hard Anodized + Signature Teal Powder Coat
FITMENT
- 2022+ Toyota GR86 (ZN8) - Requires 18-inch wheels or larger
- 2022+ Subaru BRZ (ZD8) - Requires 18-inch wheels or larger
- 2013-2021 Toyota 86 / Scion FR-S (ZN6) - Requires 18-inch wheels or larger
DISCLAIMER
- Backplate Processing Required: Installation requires trimming or modifying the OEM front brake disc dust shields/backplates.
- Non-Affiliation & Warranty: Direct parallel import of authentic JDM components. We are an independent retailer, not an authorized Project Mu dealer. Factory warranty applies in Japan only.
- 14-Day Defect Window: Customers must inspect all parts upon arrival. Defect, damage, or missing part claims must be reported within 14 days of delivery and prior to installation. Installed items are non-returnable.
- Installation: Manuals are in Japanese. Professional installation by a certified technician is required.