GrimmSpeed 02-21 Subaru WRX/STI 4-Piston Brake Caliper Kit - Gray (For 340mm Rotor) - GRM.1170.1.GRY

Each kit is application-specific, pairing our forged aluminum calipers with the correct rotor and bracket configuration for your setup. Calipers are available in your choice of Red or Gunmetal Gray anodized finishes , both designed to withstand heat and resist corrosion while delivering a clean, motorsports-ready look. From street builds to track cars, this is the braking confidence your Subaru deserves. Forged 6061-T6 Aluminum Caliper Body – 2-piece design, hard anodized for strength and corrosion resistance Dual Piston Setup – 44mm primary and 41mm secondary pistons provide even pad pressure and reduced taper Heat-Managed Pistons – Type 3 hard anodized and vented for superior thermal performance Lightweight Design – Approximately 9.9 lbs per corner with bracket and hardware Pad Compatibility – FMSI D1001 or D968 (varies by application) Rotor Compatibility – Works with commonly available Subaru OEM and STI rotors No Brake Lines Required – Compatible with factory lines (new lines may be recommended depending on vehicle) (2) GrimmSpeed 4-Piston Brake Calipers (choose Red or Gunmetal) (2) Vehicle-Specific Billet 4140 Steel Caliper Brackets Full Hardware Kit: Bridge bolts Banjo bolts Crush washers Bleeder dust caps Caliper guide pins Security cotter pins Caliper spring bridges + bolts Printable 1:1 Fitment Template Install Instructions 02-21 WRX 04-21 STI Rotor Size: 340mm Pad Type: F40 (FMSI D968) Designed for use with OEM-style hubs and rotors — no knuckle swaps or custom adapters required. * OEM Subaru 340mm Rotor (5x114.3 Cars Only) Part No.-26300VA000

Features

• Forged 6061-T6 Aluminum Caliper Body – 2-piece design, hard anodized for strength and corrosion resistance
• Dual Piston Setup – 44mm primary and 41mm secondary pistons provide even pad pressure and reduced taper
• Heat-Managed Pistons – Type 3 hard anodized and vented for superior thermal performance
• Lightweight Design – Approximately 9.9 lbs per corner with bracket and hardware
• Pad Compatibility – FMSI D1001 or D968 (varies by application)
• Rotor Compatibility – Works with commonly available Subaru OEM and STI rotors
• No Brake Lines Required – Compatible with factory lines (new lines may be recommended depending on vehicle)
• (2) GrimmSpeed 4-Piston Brake Calipers (choose Red or Gunmetal)
• (2) Vehicle-Specific Billet 4140 Steel Caliper Brackets
• Full Hardware Kit: Bridge bolts
• Banjo bolts
• Crush washers
• Bleeder dust caps
• Caliper guide pins
• Security cotter pins
• Caliper spring bridges + bolts
• Printable 1:1 Fitment Template
• Install Instructions
• Rotor Size: 340mm
• Pad Type: F40 (FMSI D968)
• Designed for use with OEM-style hubs and rotors — no knuckle swaps or custom adapters required.