Ensure reliable, heavy-duty braking control with this brand new Brake Master Cylinder from Bexar Pro Components. Engineered with a 1.75-inch bore size, this unit is a direct replacement for critical braking systems found in Freightliner FC/FL Series trucks, FS65 School Buses, GM C7, and Ford heavy-duty trucks. Trust in quality that meets or exceeds OEM specifications for casting numbers 2232543 or 31097-C.

Verified Casting Numbers

• 2232543
• 31097-C

⚠ CRITICAL: Verify Specifications

To ensure safety, verify that this 1.75-inch bore size matches your existing unit exactly. RESERVOIR NOTE: Material (metal or plastic) and height may vary based on current inventory. Current stock features a plastic reservoir with a port for a pressure switch, but no hole for a fluid level sensor. Adaptors on the outlet ports may be needed to fit your specific vehicle’s lines.

Expert Installation & Field Note

Drawing on our shop experience specializing in heavy-duty brakes since 1985, we emphasize that pushrod alignment is vital. Always bench bleed the master cylinder before installation. Ensure the pushrod is perfectly centered; even a slight misalignment in these 1.75-inch systems can lead to premature seal wear under high-pressure fleet operation. For Freightliner and GM C7 applications, verify that your reservoir clearance allows for the specific height of the unit currently in stock.