AMS Automotive PM0486-2 Clutch Master Cylinder In order to reduce warranty and downtime in difficult-to-bleed applications, AMS Automotive offers pre-filled clutch master cylinders. Fully bled system includes a master cylinder connected to the hydraulic line (includes the male quick disconnect). The system must be used with the existing OEM slave cylinder or with a dry slave cylinder purchased separately. Designed for applications that include a Concentric Slave Cylinder (CSC) inside the bell housing. In addition, the master cylinder is typically mounted at an angle that makes conventional bleeding difficult and time consuming. After installation of the clutch and the pre-filled master cylinder, a five-minute procedure to fill the CSC is all that is required. By comparison, the Ford-approved bleed procedure on a dry system can take an hour or more. When compared to the installation of dry components, installation of pre-filled clutch master cylinders substantially reduce installation time and the risk of warranty.