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 Kenworth and Peterbilt medium-duty commercial trucks, as well as specialized industrial equipment. Trust in quality that meets or exceeds OEM specifications for casting number 2239045.

Verified Casting & OE Numbers

• 2239045 (Casting Number)
• 0204839670 (PACCAR OE)

⚠ CRITICAL: Verify Specifications

To ensure safety in heavy-duty transport, verify that this 2-inch bore size matches your existing unit exactly. 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 brake lines, as this casting number 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 Kenworth and Peterbilt premium chassis. Always bench bleed the master cylinder before installation to remove all trapped air. Ensure the pushrod is perfectly centered; in 2-inch bore systems, even a slight misalignment can lead to premature seal wear under the high-pressure demands of vocational fleet operation.