New Brake Master Cylinder 1-3/4-inch bore size FE1575 FF1645 FF1575
Bexar Pro Components: Heavy-Duty Reliability for Fleet & Industry.
Key Specifications & Expert Features
- Bore Diameter: 1-3/4-inch bore size (Maximizes fluid displacement for heavy-duty circuits)
- Outlet Configuration: 3 x 1/2-20 INV (Ensures versatile and secure plumbing)
- Application: Heavy-duty trucks, buses, and commercial industrial machinery.
- Companion Repair Kit: 196MK (View Compatible Kit)
Verified Casting & Part Numbers
Matching your existing part number is the most reliable method to ensure correct fitment. This unit replaces:
- FE1575
- FF1645
- FF1575
- AR12E1
- 91108-C
- B258
Expert Installation & Field Note
Based on our shop experience specializing in heavy-duty brakes since 1985: The large 1-3/4-inch bore is critical for maximizing fluid displacement to large wheel cylinders or calipers. When installing this unit, ensure your bleed procedure is thorough to remove all air from the extensive lines, which is the most common cause of a spongy pedal in high-volume commercial systems.
⚠ CRITICAL: Verify Specifications
To ensure safety, verify that this master cylinder’s 1-3/4-inch bore size and three (3) 1/2-20 outlets match your existing unit before purchasing.









