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 GMC, Chevrolet, and Isuzu medium-duty trucks, as well as various industrial equipment chassis. Trust in quality that meets or exceeds OEM specifications for casting number 2239045.

Verified Casting Numbers

• 2239045

⚠ CRITICAL: Verify Specifications

To ensure safety, verify that this 2-inch bore size matches your existing unit exactly before purchasing. Note that switches are not included with this assembly. 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 heavy-duty 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 GMC and Isuzu medium-duty 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 and vocational operation. Verify your port orientation, as this model specifically features only 2 port holes on the side of the cylinder.