Cusco 222 54B AT Brake Master Cylinder Stopper

The Cusco 222 54B AT Brake Master Cylinder Stopper is a bolt-on chassis brace engineered to eliminate firewall flex and deliver a firmer, more responsive brake pedal. During hard braking, the sheet metal firewall to which the brake master cylinder is mounted flexes significantly from hydraulic pressure and applied pedal force — reducing effective piston travel and diminishing braking performance.

Cusco's Brake Cylinder Stopper addresses this problem directly by bracing the master cylinder against the suspension tower, preventing forward firewall movement and ensuring that every ounce of pedal input is converted into stopping force.

Key Features:

• Eliminates unwanted brake master cylinder and firewall flex under hard braking
• Bolt-on installation using standard hand tools — no cutting, welding, or fabrication required
• Compatible with both factory brake systems and upgraded aftermarket units
• Finished in Cusco's signature blue powder coat
• Constructed from high-grade Japanese steel for durability and long-term performance
• All necessary mounting hardware included

The Cusco Brake Cylinder Stopper is an ideal upgrade for performance and track-day enthusiasts looking to improve brake pedal feel and consistency. It pairs especially well with stainless steel braided brake lines for a comprehensive brake system refresh.