Clutch Masters Master Cylinder for 2015-2021 WRX/STi (MC15020)

Clutch Masters master cylinder upgrade for 2015-2021 WRX/STi models. The OEM unit is usually good enough, but upgrading it will make your hydraulic system able to handle more aggressive driving. This kit also deletes the delay valve allowing you to shift quickly and let the clutch immediately engage.

This is a complete plug and play kit and includes everything you need to install this system. Will work with OEM slave cylinders. The billet aluminum parts are available with a red, violet or black anodized finish.

Vehicle Fitment:
2015-2021 Subaru WRX (USDM LHD)
2015-2021 Subaru STi (USDM LHD)

More from Clutch Masters:
When upgrading your clutch, don't overlook upgrading your clutch master cylinder as well. Typically the OEM master cylinder will work just fine, but sometimes that master cylinder is getting old and tired and possibly might be leaking. Or maybe your want just a little bit more crisper pedal feel when operating your clutch. Upgrading to the Clutch Masters Billet Aluminum Master Cylinder will make sure your clutch hydraulic system is up to snuff and able to handle more aggressive driving. The other notable upgrade this kit will do for you is eliminate the clutch delay valve that is built into the factory master cylinder. The delay valve is a one way regulating valve that slows the fluid returning from the slave cylinder after you let off the clutch. This delay is especially noticeable in quick 1-2 gear shifts where you get back on the gas before the clutch is fully engaged. By getting rid of the delay valve you are able to shift quickly and the clutch is immediately engaging. On high powered cars where you want to still enable a little bit of delay or slip of the clutch to prevent the drivetrain from getting a shock, check out our tunable Flow Control Valve.

On the 2015 and Up WRX and STi the clutch master cylinder uses same reservoir that feeds the brake master cylinder so we include a length of rubber hose that goes from the reservoir to the clutch master cylinder. 

Important Notes:
Because of the wide range of adjustability on this master cylinder with the ability to adjust where the master cylinder is situated relative to the firewall and the pedal, as well as the ability to adjust the clevis on the push rod, it is highly recommended that you check the overall throw of your new master cylinder setup and make sure that you are not overthrowing the diaphragm of the clutch. You may need to setup a clutch pedal stop or make adjustments to the master cylinder housing location or push rod and clevis assembly to prevent overthrowing the diaphragm. With an OEM slave cylinder this should be difficult to do because it only has so much travel but it is something that must be consider when using our billet master cylinders. We made these master cylinders as adjustable as possible to allow users to dial in where in the clutch pedal's travel the clutch is engaging and disengaging.

Purchase Includes:
Master Cylinder
Stainless Line
Rubber Line
Banjo and Washers
Wrench

Install Note:
This kit will use the OEM Subaru reservoir since it shares it with the brakes.

Additional Notes:
Newest revision by Clutch Masters is now pictured as of July 2024. This used to come with a Wilwood cylinder.

This part is designed for LHD USDM market cars. As far as we know this does NOT fit RHD cars. 

See more Clutch Masters Parts