Project Mu FS44S 4POT Slim Front BBK 332x28mm for 2013+ FRS/BRZ/86 2022+ BRZ/GR86
Regular price
$3,595.00
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OVERVIEW
Strengthen front stopping capability and optimize wheel clearance with the Project Mu 4POT FS44S Slim Forged Front Caliper Kit for 2013+ GR86 / BRZ / 86 / FR-S (ZN6/ZC6/ZN8/ZD8). Engineered specifically to eliminate wheel spoke interference, the FS44S features a narrowed forged aluminum caliper body measuring just 140.2mm in width. Built with a performance-oriented 4-piston x 4-pad layout (1 pad per piston), the kit synchronizes pad application to eliminate tapering and deliver exceptional pedal modulation. Paired with lightweight 332mm x 28mm 2-piece straight 8-slit floating rotors, this 332mm slim kit provides serious thermal endurance for street and track use while expanding fitment across popular 17-inch motorsport wheels.
| Caliper Feature / Spec | FS4M Street 4POT | FS44S Slim 4POT (332mm) | FS44S Slim 4POT (355mm) | FS44 Full-Size 4POT (345mm) |
|---|---|---|---|---|
| Axle Position | Front Axle Specific | Front Axle Specific | Front Axle Specific | Front Axle Specific |
| Caliper Profile & Width | Compact Street Body (275.0mm L x 144.5mm W) | Slim Body (140.2mm Width - High Spoke Clearance) | Slim Body (140.2mm Width - High Spoke Clearance) | Standard Full Body (156.25mm Width - Heavy Duty) |
| Piston Diameter / Pad Layout | 38mm Pistons x 4 (2-Pads per Caliper) | 38mm Pistons x 4 (4-Pads per Caliper) | 38mm Pistons x 4 (4-Pads per Caliper) | 41mm Oversized Pistons x 4 (4-Pads per Caliper) |
| Rotor Specs & Thickness | 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 Heavy-Duty (2-Piece Straight 8-Slit) |
| Target Application | Street Performance / Canyon & OEM 17" Wheels | Street & Track with Tight 17"+ Wheel Clearance | Street & Track with Tight 18"+ Wheel Clearance | Heavy-Duty Circuit / Maximum Clamping Power |
FEATURES
- Slim Forged Aluminum Caliper Profile: 140.2mm slim overall width minimizes outboard protrusion to maximize spoke clearance on concave and mesh wheels.
- 4-Piston x 4-Pad Architecture: Uses 4 independent pads per caliper (1 pad per piston) to prevent uneven pad wear, eliminate tapering, and maintain a sharp pedal feel.
- 332mm x 28mm 2-Piece Floating Rotors: Billet aluminum hat and vented outer rotor ring effectively isolate heat transfer and reduce unsprung rotating mass.
- Straight 8-Slit Face Venting: Continuously cleans pad surface debris, improves initial bite, and exhausts friction boundary gases.
- Dual Dust Seal Barrier Structure: Features outer dust boots positioned forward of the internal fluid pressure seals to prevent contamination from brake dust and road grime.
WHAT IS INCLUDED
- 2x Project Mu FS44S Slim Forged 4-Piston Front Calipers (Signature Teal Finish)
- 2x Project Mu 332mm 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 & Complete Installation Hardware
PART NUMBERS
- Manufacturer Part Number: FS44S-F103
SPECIFICATIONS
- Position: Front Axle
- Caliper Type: Forged Aluminum 4-Piston Slim Profile (FS44S)
- Piston Diameter: 38mm x 4
- Caliper Dimensions: Length: 282.8mm | Width: 140.2mm | Height: 72.3mm
- Rotor Dimensions: 332mm 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) & Subaru BRZ (ZD8)
- 2013-2021 Toyota 86 / Scion FR-S (ZN6) & Subaru BRZ (ZC6)
- *Requires most 17-inch or larger aftermarket wheels (slim caliper design maximizes spoke clearance)
DISCLAIMER
- Backplate Processing Required: Installation requires trimming or modifying OEM front brake 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.