Clutch Slave Cylinders

Slave cylinders receive hydraulic pressure from the master cylinder and move the clutch fork or release bearing. External slave cylinders bolt to the bellhousing; concentric slave cylinders (CSC) sit around the input shaft inside the bellhousing and integrate the release bearing.

External slave cylinders are specified by bore, mounting bolt pattern, pushrod length and hydraulic fitting. CSCs are specified by OEM reference, bore and bearing design, and are best replaced during clutch jobs because of access. Leaking slave cylinders can contaminate clutch facings if fluid enters the bellhousing. Related: clutch master cylinders.