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 Isuzu F-Series medium-duty trucks, GMC W7 tilt cab chassis, and various industrial equipment vocational applications. 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. 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 number was utilized across multiple heavy-duty 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 Isuzu and GMC tilt-cab 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 F-Series trucks, double-check that your mounting surface is clean and free of corrosion to ensure a true seal.