Radium Master Cylinder Brace

2015-2021 Subaru WRX / STI / 2014-2018 Forester XT


SKU: 20-0255We price match!

Out of Stock


  • Reduces the overall firewall flex under heavy braking conditions
  • Improves the braking feel and driver feedback
  • Excellent upgrade for daily driving duties, and especially for those weekend track events
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Radium Engineering Master Cylinder Brace 


  • 6061 billet construction
  • Specially-designed CNC foot contacts
  • Pre-load can be adjusted with the anodized aluminum green bolt and can be locked in place with a stainless steel jam nut
  • Will reduce firewall flex under heavy braking conditions to provide a more solid feel and better feedback



This is the Radium Engineering Master Cylinder Brace. This particular brace is compatible with LHD 15-21 WRX models, 15-21 STI models, as well as 14-18 Forester XT models. What happens, is under heavy braking conditions, the firewall can flex also providing a spongy braking feel. Radium Engineering understands that the master cylinder flexes in an arcuate path, therefore, a specially designed CNC machined foot contacts the master cylinder to counteract the arc movement. Preload is adjusted with the anodized aluminum green bolt, it is then locked into place with a stainless steel jam nut. Installation is simple and can be performed in 30 minutes or less. 





1 customer review

Average rating
(based on 1 review)
Ease of Installation
Fit / Quality
Overall Satisfaction
  1. poor quaility

    By Dr. DEES December 19, 2022

    i receved this master cylinder brace a few months back. install was easy but the included hardware is junk! The green bolt snaps at the slightest over tightening. And 2 out of 3 of the mounting bolts stripped very easily.

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