GrimmSpeed 4-Piston Brake Caliper Kit - 340mm Rotor | 2004-2021 Subaru STI (GRM.1170.1)

4-Piston Brake Caliper Kit - 340mm Rotor for 2004-2021 Subaru STI by GrimmSpeed

The stock single-piston caliper found on most Subaru platforms gets the job done — but it wasn’t designed for the kind of aggressive driving, tracking, or build evolution most GrimmSpeed drivers pursue. That’s where Grimmspeeds 4-Piston Brake Caliper Kit comes in.

Purpose-built for Subaru performance, this fixed caliper setup brings balanced stopping power, improved heat management, and consistent pedal feel to your favorite chassis. Designed in-house and tested under real-world conditions, the system offers a true performance solution — with no need to chase down used Brembos or deal with custom brackets.

Features

• Forged 6061-T6 Aluminum Caliper Body
• Dual Piston Setup
• Heat-Managed Pistons

Benefits

• Lightweight Design
• Compatible with FMSI D1001 or D968 pads
• Works with commonly available Subaru OEM and STI rotors

Applications

• 2004-2021 Subaru STI

What's In The Box?

• (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

References

• Installation Instructions

Warranty

• Limited Manufacturers Warranty