Perrin 15-21 WRX/STI Master Cylinder Brace Black | PSP-BRK-403BK

Eliminate brake pedal flex and restore confidence under hard braking with the PERRIN Master Cylinder Brace for the 2015–2021 Subaru WRX and STI.

Your brake pedal connects to a thin sheet metal firewall that flexes under repeated braking forces — especially noticeable during heavy track use or even routine stops. The PERRIN Master Cylinder Brace creates a rigid bridge between the firewall, master cylinder, and shock tower, dramatically reducing that flex and delivering a firmer, more consistent pedal feel from the moment it's installed.

CNC-machined from a single piece of 6061-T6 billet aluminum for maximum rigidity, the brace features an adjustable preload screw that lets you dial in tension directly on the master cylinder for a custom-tight fit. Stainless steel hardware and a durable anodized black finish ensure it holds up in even the harshest conditions — and looks great doing it.

Key Features:

• Reduces firewall flex for firmer, more consistent brake pedal feel
• CNC-machined from 6061-T6 billet aluminum — one-piece design for maximum stiffness
• Adjustable preload screw for custom tension on the master cylinder
• Stainless steel hardware with anodized black finish for long-term durability
• Bolt-on installation — no cutting or drilling required

Fitment:
Subaru WRX (2015–2021)
Subaru STI (2015–2021)

Installation:
Difficulty: ★★☆☆☆
Tools Required: Basic hand tools
Warranty: PERRIN Limited Warranty

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