Clutch Masters MC15017-R for 02-21 Subaru WRX/STi .75" Bore Master Cylinder Upgr

Vehicle Fitment

• 2002-2005 Subaru WRX (5-Speed, 2.0L Turbo EJ20)
• 2006-2014 Subaru WRX (5-Speed, 2.5L Turbo EJ25)
• 2004-2014 Subaru WRX STi (6-Speed, 2.5L Turbo EJ25)

Features

• Direct-fit performance clutch master cylinder upgrade
• 6061 billet aluminum construction for strength and durability
• .75-inch bore (performance-oriented hydraulic response)
• Improves clutch pedal feel and engagement consistency
• Eliminates factory clutch delay valve for faster response
• Includes stainless steel -3AN hydraulic line for durability
• Reduces flex compared to OEM plastic/aluminum units
• Designed to support high-performance clutch systems
• Fully compatible with OEM slave cylinder systems

Specifications

• Part Number: MC15017-R
• Type: Clutch Master Cylinder Upgrade Kit
• Bore Size: 0.75 in (19.05 mm)
• Material: 6061 billet aluminum
• Finish: Anodized (Red)
• Hydraulic Line: -3AN stainless steel braided
• Application: Performance / Street / Track use
• Compatibility: Subaru WRX and WRX STi (02-14)

Included Components

• 1x Clutch master cylinder assembly (billet aluminum)
• 1x -3AN stainless steel braided line
• 1x Reservoir with cap
• 1x Remote reservoir bracket
• 1x Billet adapter and jam nut
• 1x Push rod with billet clevis
• 2x banjo fittings with crush washers
• 1x rubber hose for reservoir connection
• Installation hardware and fittings

Product Description

The Clutch Masters MC15017-R is a high-performance clutch master cylinder upgrade designed for Subaru WRX and WRX STi models from 2002 through 2014. It is engineered to improve hydraulic efficiency, offering a more direct and consistent clutch pedal feel compared to factory units. This upgrade is especially beneficial for vehicles equipped with performance or heavy-duty clutch systems where OEM components may lack the necessary strength or responsiveness.

Constructed from 6061 billet aluminum, this master cylinder is significantly stronger and more durable than stock units. The .75-inch bore design helps increase hydraulic fluid displacement, which improves clutch engagement and reduces pedal travel. By eliminating the factory clutch delay valve, this system allows for quicker shifts and more precise control - ideal for performance driving and track use. It also includes a stainless steel braided line to reduce expansion and maintain consistent hydraulic pressure under load.

Fitment is confirmed for 2002-2005 Subaru WRX (2.0L), 2006-2014 Subaru WRX (2.5L), and 2004-2014 Subaru WRX STi with both 5-speed and 6-speed manual transmissions. This system works with OEM slave cylinders and is a direct bolt-on upgrade. It is recommended for enthusiasts running upgraded clutches or seeking improved pedal response. Fitment is confirmed through 2014, and no confirmed data is available beyond that at this time.