New Brake Master Cylinder 1-1/8-inch bore size FD4480 21919
Bexar Pro Components: Heavy-Duty Reliability for Fleet & Industry.
Key Specifications & Expert Features
- Bore Diameter: 1-1/8-inch bore size (Precision-honed for consistent hydraulic pressure)
- Outlet Size: 1/2-20 INV (Standard inverted flare thread for secure line connection)
- Application: Optimized for heavy-duty fleet trucks and specialized industrial machinery.
- Companion Repair Kit: 146MK (View Compatible Kit)
Verified Casting & Part Numbers
Matching your existing casting number is the most reliable method to ensure correct fitment. This unit replaces:
- FD4480
- 21919
- 21919C
- 5454736
- 616578
Expert Installation & Field Note
Based on our shop experience specializing in heavy-duty brakes since 1985: When installing the M2191841, pay close attention to pushrod alignment. Misalignment is a primary cause of uneven internal seal wear, which can lead to premature bypass in fleet and industrial applications. Always bench bleed the unit before final installation to ensure a firm pedal and perform a complete system flush with fresh fluid to protect the precision 1-1/8-inch bore galleries.
⚠ CRITICAL: Verify Specifications
To ensure safety, verify that this master cylinder’s 1-1/8-inch bore size and 1/2-20 INV outlet match your existing unit exactly before purchasing. Correct displacement is essential for automotive and industrial safety.
| Weight | 5 lbs |
|---|---|
| Dimensions | 8 × 6 × 4 in |
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Brake Master Cylinder Repair Kits