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Model ID: YZ139
The YZ139 Hydraulic Throwout Bearing (also known as a Concentric Slave Cylinder or CSC) represents the modern standard in clutch actuation systems, replacing the complex mechanical linkages of the past. Traditional systems rely on a slave cylinder pushing an external fork and pivot ball—components that are prone to wear, noise, and flexing. The YZ139 eliminates these failure points by mounting directly onto the transmission input shaft quill. This concentric design applies hydraulic pressure directly in line with the clutch pressure plate fingers, resulting in a significantly lighter and more linear pedal feel that reduces driver fatigue in heavy traffic.
Beyond improved ergonomics, the YZ139 is engineered for maintenance-free longevity. It features a self-adjusting geometry that automatically compensates for clutch disc wear over time, ensuring the engagement point remains consistent throughout the life of the clutch pack. The unit is sealed with high-grade EPDM O-rings compatible with all DOT 3 and DOT 4 brake fluids, preventing the internal bypass leaks that cause "spongy" pedals. The bearing face is pre-lubricated with high-temperature polyurea grease and features a low-friction contact surface to minimize heat generation during continuous clutch modulation.
