Fits 2013-2020 Subaru BRZ, Toyota 86, and Scion FR-S.

Eliminate firewall flex and restore confidence in your braking system with the GrimmSpeed Master Cylinder Brace. Under heavy braking, the thin sheet metal of the firewall can flex, leading to a soft or mushy pedal feel. This brace provides a rigid mechanical bridge between the master cylinder and the vehicle's shock tower, ensuring that every millimeter of pedal travel is converted into stopping power rather than chassis deflection.

• Reduces firewall deflection for firmer, more consistent brake pedal feel
• Improves braking modulation and tactile feedback during spirited driving
• Precision-engineered for a direct bolt-on fit to factory mounting points
• Durable construction designed to withstand high-stress engine bay environments
• Manufacturer Part Number: GRM091038

Fits select 2008-2014 Subaru Impreza, WRX, and STI models, and 2008-2009 Subaru Legacy models.

The thin sheet metal of the Subaru firewall is prone to flexing under heavy braking, which manifests as a soft or inconsistent pedal feel as the master cylinder physically shifts. The GrimmSpeed Master Cylinder Brace (MPN: GRM091029) provides a rigid bridge between the brake master cylinder and the driver-side shock tower. By creating a mechanical stop, this brace eliminates firewall deflection, ensuring that every bit of pedal pressure is converted into braking force rather than wasted energy.

• CNC laser-cut and bent steel construction for maximum rigidity
• Durable textured black powder coat finish for corrosion resistance
• Large adjustment bolt with a high-visibility red anodized cap
• Includes all necessary high-grade mounting hardware for a bolt-on installation
• Reduces firewall flex to provide a firm, tactile brake pedal feel
• Manufacturer Part Number: GRM091029

Fits 2003-2006 Mitsubishi Lancer Evolution models.

The GrimmSpeed Master Cylinder Brace (GRM091019) is a critical upgrade for drivers seeking a more responsive and consistent brake pedal feel. In the Mitsubishi Evo 8 and 9, the thin sheet metal of the firewall often flexes when the brake pedal is depressed, resulting in a "spongy" sensation and diminished braking precision. This brace bridges the distance between the master cylinder and the strut tower, creating a solid mechanical stop that prevents the cylinder from moving forward under pressure.

• Eliminates firewall deflection during heavy or threshold braking
• Provides a firmer, more direct brake pedal feel for better modulation
• Designed specifically for the Mitsubishi CT9A chassis
• Includes all necessary hardware for a secure installation
• Manufacturer Part Number: GRM091019

Fits select 2008-2014 Subaru Impreza, WRX, and STI, and 2008-2009 Legacy models.

Under heavy braking, the thin sheet metal of the Subaru firewall is prone to flexing, which creates a spongy, inconsistent brake pedal feel. The GrimmSpeed Master Cylinder Brace (MPN: 091029) provides a rigid bridge between the master cylinder and the shock tower to eliminate this deflection. By bracing the master cylinder, this component ensures that every bit of pedal effort is translated into hydraulic pressure rather than firewall movement, resulting in significantly improved brake modulation and confidence.

• Eliminates firewall flex to provide a firm, direct brake pedal response
• Precision-engineered to bolt directly to factory mounting points
• High-strength construction with a durable finish for long-lasting performance
• Essential upgrade for improved braking consistency in performance driving conditions
• Manufacturer Part Number: 091029

Fits 2013-2020 Subaru BRZ, Scion FR-S, and Toyota 86 models across all trim levels.

The GrimmSpeed Master Cylinder Brace (MPN 091038) is a critical upgrade for drivers looking to improve braking response and pedal feel. During hard braking, the thin sheet metal of the firewall can flex, causing the master cylinder to move and creating a spongy or inconsistent pedal feel. This brace provides a rigid bridge between the master cylinder and the vehicle's shock tower, effectively eliminating that flex.

Engineered for a precise fit, this component bolts directly to factory mounting points, requiring no permanent modifications. By locking the master cylinder in place, you ensure that every ounce of foot pressure is translated directly into hydraulic pressure for more confident and predictable stops on the street or the track.

• Eliminates firewall flex for a firmer, more linear brake pedal feel
• Direct bolt-on design using existing chassis mounting points
• High-strength construction provides maximum rigidity under heavy braking loads
• Durable finish for long-term corrosion resistance
• Manufacturer Part Number: 091038

Fits 2003-2006 Mitsubishi Lancer Evolution VIII/IX.

Eliminate brake pedal mush and improve braking confidence with the GrimmSpeed Master Cylinder Brace (MPN 091019). Under heavy braking, the thin Mitsubishi Lancer Evolution firewall is prone to flexing as the brake master cylinder is pushed forward. This deflection results in a soft pedal feel and inconsistent modulation, which is particularly noticeable during track use or spirited driving.

The GrimmSpeed brace solves this by bridging the gap between the master cylinder and the driver-side shock tower, providing a solid mechanical stop. By locking the master cylinder in place, it ensures every millimeter of pedal travel is converted into braking force rather than firewall flex.

• CNC laser-cut and bent heavy-gauge steel for maximum rigidity
• Durable black powder-coat finish resists corrosion and brake fluid
• Large adjustable tension bolt provides a precise, solid contact point
• Direct bolt-on installation utilizing factory mounting holes
• Includes all necessary hardware for a complete install
• Manufacturer Part Number: 091019

Fits 2015 Subaru Impreza (VA Chassis) USDM models.

The Cusco Brake Cylinder Stopper (BCS) is a performance-oriented reinforcement designed to eliminate firewall flex during heavy braking. In many factory configurations, the force applied to the brake pedal is enough to cause the firewall to deflect, allowing the master cylinder to shift forward. This movement creates a spongy or inconsistent pedal feel. The Cusco BCS functions as a rigid brace, securing the master cylinder against the shock tower to ensure every millimeter of pedal travel is converted into braking force.

• Direct bolt-on installation for USDM Left-Hand Drive (LHD) vehicles
• Significantly reduces firewall flex to provide a firmer, more communicative brake pedal
• Improves braking modulation and confidence during spirited driving or track use
• Durable construction designed to withstand high engine bay temperatures and mechanical stress
• Manufacturer Part Number: 6A1 561 ALHD

Fits 2002-2007 Subaru Impreza models, including WRX, STI, RS, TS, 2.5i, and Outback Sport.

The Cusco Brake Cylinder Stopper (also known as a Master Cylinder Brace) is a bolt-on performance upgrade designed to eliminate the firewall flex that occurs during heavy braking. In the 2002-2007 Impreza chassis, the sheet metal of the firewall can deflect under the pressure of the brake master cylinder, resulting in a spongy or mushy pedal feel. By providing a rigid stop against the end of the master cylinder, this brace ensures that all your foot's effort is translated into hydraulic pressure rather than mechanical distortion.

Crafted for USDM left-hand drive (LHD) models, this component significantly sharpens brake pedal response and improves modulation for more consistent performance on the street or track. The unit features Cusco's signature blue finish and is engineered to mount securely to existing factory points without the need for custom fabrication.

• Eliminates master cylinder movement by reinforcing the firewall
• Provides a firmer, more direct brake pedal feel
• Direct bolt-on installation using factory mounting points
• Durable steel construction with signature Cusco blue powder coat
• Designed specifically for USDM GDA, GDB, and GGC chassis (LHD)
• Manufacturer Part Number: 666 561 ALHD