ACDelco 18m2643 Professional Brake Master Cylinder Assembly

The ACDelco 18M2643 Professional Brake Master Cylinder Assembly is a premium aftermarket replacement brake master cylinder engineered to deliver reliable, confident braking performance. Built using both aluminum and iron castings, this master cylinder is designed as a direct-fit replacement for many vehicles, meeting strict expectations for fit, form, and function.

Key Features:

• Meets brake performance requirements of SAE J1153 and J1154 testing standards for proven reliability and quality
• Pressure tested to ensure safe and consistent braking performance
• Cast iron and aluminum construction places no extra stress on the brake booster mounting
• Ethylene Propylene (EPDM) and Styrene Butadiene (SBR) rubber internal components provide superior resistance to heat, corrosion, and leakage
• Precision geometrical tolerances ensure the cylinder body and plastic reservoir mate correctly for a leak-free fit
• Piston assembly and return spring work together to prevent brake drag, reducing the risk of premature brake pad wear
• Ready to bench bleed and install straight out of the box — no assembly required

The ACDelco 18M2643 is part of the Professional series, which undergoes the same rigorous quality approval process as ACDelco's OE parts, making it a dependable choice for brake system service and repair.