New Clutch Slave Cylinder 15/16-inch bore size FD27125
Bexar Pro Components: Heavy-Duty Reliability for Fleet & Industry.
Key Specifications & Expert Features
- Bore Diameter: 15/16-inch bore size (Precision-honed for smooth actuation and proper pedal travel)
- Inlet Port: 7/16″ x 24 INV (Single port design for secure hydraulic connection)
- Application: Built for heavy-duty fleet trucks, commercial buses, and specialized industrial drivetrains.
- Repair Kit: N/A (No rebuild kit available; full unit replacement required to ensure system integrity)
Verified Casting & Part Numbers
Google Search & Fitment Warning: Matching your existing casting number is the most reliable method to ensure correct fitment. This unit replaces:
- FD27125
Expert Installation & Field Note
Based on our shop experience specializing in heavy-duty brakes and clutches since 1985: When installing the CS3789343 slave cylinder, verify that the release fork and pivot points are lubricated and free of debris. Air trapped in the slave cylinder is the #1 cause of incomplete clutch release. We recommend gravity bleeding followed by a standard pressure bleed to ensure all air is purged from the 15/16-inch bore size chamber. Always use fresh, approved fluid to protect the internal seals and maximize the lifespan of the new unit.
⚠ CRITICAL: Verify Specifications
To ensure safety and proper clutch travel, verify that this slave cylinder’s 15/16-inch bore size and 7/16″ x 24 mounting configuration match your existing unit exactly. Improper sizing will result in clutch drag or master cylinder damage. This component is designed for hydraulic clutch systems only.






