Ensure reliable, heavy-duty braking control with this brand new Brake Master Cylinder from Bexar Pro Components. Engineered with a powerful 2-inch bore size, this master cylinder is a direct replacement for critical braking systems found in Freightliner M2, MT, and S2 series trucks, as well as specialized industrial equipment and commercial chassis. Trust in quality that meets or exceeds OEM specifications for casting number 2239045.

Verified Casting & Cross-Reference Numbers

• 2239045 (Primary Casting)
• Freightliner: ASL 0204839816F2T
• Bendix: BX012379

⚠ CRITICAL: Verify Specifications

To ensure safety, verify that this 2-inch bore size matches your existing unit exactly before purchasing. Brake master cylinder reservoir material and height may vary, but the core fit and hydraulic function remain identical. IMPORTANT: Adaptors on the outlet ports may be needed to fit your specific vehicle’s existing brake lines, as this casting was utilized across multiple assembly configurations.

Expert Installation & Field Note

Drawing on our shop experience specializing in heavy-duty brakes since 1985, we emphasize that pushrod alignment is vital for Freightliner M2 and MT-Series chassis. Always bench bleed the master cylinder before installation. Ensure the pushrod is perfectly centered; in 2-inch bore systems, even a slight misalignment can lead to premature seal wear under high-pressure fleet operation. For M2 delivery and S2RV applications, verify that your reservoir clearance allows for vocational-specific cab or body mounting.