ACDelco 18M2418B Gold Brake Master Cylinder Assembly Bore - 0.937

The ACDelco 18M2418B is a Gold-series replacement brake master cylinder engineered to deliver reliable, confident braking performance. Built using a combination of aluminum and iron castings, this master cylinder offers a precise OE-level fit with no additional machining or assembly required.

Key Features:

• 0.937" bore diameter for accurate hydraulic pressure output
• Constructed with aluminum and iron castings — no additional stress on brake booster mounting
• EPDM (Ethylene Propylene) and SBR (Styrene Butadiene) rubber internals for superior resistance to heat, corrosion, and fluid leakage
• Meets SAE J1153 and SAE J1154 brake performance testing requirements
• Pressure tested to ensure safe and confident braking
• Geometrical tolerances ensure proper body-to-reservoir fitment
• Piston assembly and return spring help prevent brake drag and premature pad wear
• Includes master cylinder cap and bleeder hoses — ready to bench bleed and install right out of the box
• 2 mounting holes for direct bolt-on installation
• OEM cross-reference: 19304686

The ACDelco Gold line undergoes the same rigorous 18-step quality approval process as OE parts, making this an ideal replacement for GM and compatible non-GM vehicles. Backed by ACDelco's trusted engineering heritage, the 18M2418B restores factory braking performance with a part designed to meet your expectations for fit, form, and function.