Clutch Masters Clutch Master Cylinders Hydraulics 15-21 WRX / 04-21 STI | Adjustable Bore .700" | Hydraulic Clutch Upgrade
Overview
The Clutch Masters Clutch Master Cylinder is a precision-engineered hydraulic upgrade designed for Subaru WRX and WRX STI models from 2015 to 2021. This billet aluminum master cylinder replaces the OEM unit to provide a crisper, more responsive clutch pedal feel and eliminates the factory clutch delay valve for immediate clutch engagement. Ideal for enthusiasts upgrading their clutch system or seeking improved pedal feedback, this master cylinder ensures your hydraulic system keeps pace with aggressive driving and performance modifications.
Crafted from 6061 billet aluminum, this master cylinder reflects Clutch Masters' commitment to quality and adjustability. The design allows fine-tuning of the master cylinder’s position relative to the firewall and pedal, as well as adjustable push rod length and clevis positioning. This flexibility lets drivers dial in clutch engagement and disengagement points precisely to their preference, a feature that sets this product apart from standard replacements.
By removing the clutch delay valve, this upgrade significantly improves shift response, especially during quick 1-2 gear changes where immediate clutch re-engagement is critical. For Subaru owners running high-powered setups who want to moderate clutch engagement shock, Clutch Masters offers a tunable Flow Control Valve as an optional complement. This master cylinder is a plug-and-play solution compatible with OEM slave cylinders, making it a practical and effective upgrade for WRX and STI drivers focused on performance and reliability.
Features & Specifications
This Clutch Masters Clutch Master Cylinder is engineered for 2015-2021 Subaru WRX and WRX STI models and features a .700" bore size for enhanced hydraulic response. Constructed from durable 6061 billet aluminum, it delivers precise clutch engagement and improved pedal feel for Subaru enthusiasts seeking a more direct and adjustable clutch operation.
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Brand: Clutch Masters
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Product: Clutch Master Cylinders Hydraulics 15-21 WRX / 04-21 STI
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Part Number: MC15020-R
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Fitment: 2015-2021 Subaru WRX / STI 6-Speed
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Material: 6061 Billet Aluminum
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Finish: Natural Aluminum
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Construction: CNC Machined
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Origin: Not specified
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Bore Size: .700 inches
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Includes: Adjustable push rod and billet clevis, stainless steel -3AN line, banjo fittings with crush washers, rubber hose for reservoir connection
Key Benefits
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Performance: Eliminates factory clutch delay valve for immediate clutch engagement and quicker shifts.
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Adjustability: Fully adjustable master cylinder position and push rod length allow precise clutch pedal travel tuning.
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Durability: CNC-machined billet aluminum construction ensures long-lasting strength and resistance to wear.
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Fitment: Plug-and-play design compatible with OEM slave cylinders and factory reservoir connections on 2015+ WRX/STI.
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Pedal Feel: Provides a crisper and more direct clutch pedal response for enhanced driver feedback.
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Installation: Complete kit includes all necessary hardware and fittings for a straightforward upgrade.
What's Included
- 1× Clutch Masters 6061 Billet Aluminum Master Cylinder (.700" Bore)
- 1× Stainless steel -3AN hydraulic line
- 1× Billet aluminum master cylinder adapter and jam nut
- 1× Barb fitting
- 1× Rubber hose to connect factory reservoir to master cylinder (for 2015+ WRX/STI)
- 1× Extended and adjustable push rod with billet clevis
- 2× Banjo fittings with crush washers
- 1× Jam nut tool
- Installation instructions included
Installation & Compatibility
Installation of the Clutch Masters master cylinder is generally straightforward for those with moderate mechanical experience, as it is designed as a direct replacement compatible with OEM slave cylinders. The kit includes all necessary fittings and hardware, including a rubber hose for reservoir connection on 2015 and newer WRX/STI models. Due to the adjustable nature of the master cylinder and push rod, it is highly recommended to carefully measure and set the clutch pedal throw to avoid overthrowing the clutch diaphragm. Adjustments to the master cylinder housing location, push rod length, or installation of a clutch pedal stop may be necessary to ensure proper operation and prevent damage.
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Professional Installation: Recommended for best results
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Modifications Required: None, but adjustment and setup required to prevent diaphragm overthrow
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Verify Compatibility: Confirm fitment for your specific year and trim level of Subaru WRX or STI
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