ACDelco 18M2568B Professional Durastop Brake Master Cylinder Assembly

The ACDelco 18M2568B Professional Durastop Brake Master Cylinder is a high-quality replacement brake master cylinder engineered to meet the demanding performance standards of GM-platform trucks and vans. Built using both aluminum and iron castings, this master cylinder delivers reliable, long-lasting braking performance as a direct OEM-style replacement.

Key Features:

• Aluminum construction — lightweight yet durable housing for long service life
• 1.5-inch (38.1 mm) bore diameter — precise fit for proper brake system hydraulics
• Dual-port design — two brake line outlets with 14 mm (0.551 in.) primary and secondary outlet threads
• EPDM and SBR rubber internals — Ethylene Propylene and Styrene Butadiene rubber components provide superior resistance to heat, corrosion, and leakage
• Reservoir included — complete assembly with reservoir; no separate purchase required
• Cap included — master cylinder cap included for a complete, ready-to-install unit
• Bleeder hoses included — all hardware needed for bench bleeding is in the box
• No assembly required — bench-bleed-ready, direct drop-in replacement
• 2 mounting holes — standard mounting configuration; no mounting bracket included
• OEM part number cross-reference: 88875893

This ACDelco Gold (Professional) brake master cylinder meets SAE J1153 and J1154 brake performance testing requirements, ensuring dependable stopping power right out of the box. No programming is required for installation.