Porsche GT3 Brake Master Cylinder Upgrade


Increases brake pedal modulation, firmness, and predictability while reducing mushiness and travel.



The GT3 brake master cylinder offers a 13% larger piston bore which adds a premium, predictable feel to your brake pedal. Eliminates excessive pedal travel, reduces mushiness, and makes braking more predictable at the limits. Pair with upgraded stainless steel brake lines and fresh racing fluid for a rewarding experience for your right foot. We swear by this upgrade for all of our Porsches that see track use, but you’ll also love the results on the street.


  • Applicable for 987 Boxster / Cayman and 997 Carrera models
  • 1L or two containers of 500ml brake fluid are required for a flush after installation.
  • We recommend upgrading to stainless steel brake lines at the same time for maximum results and convenience

SHIPPING:  Usually ships same or next business day. Contact us for expedited orders to ensure proper delivery time.

Have any questions? Speak to our Porsche Performance Specialist with years of first hand experience setting up brake systems about your specific needs!