ACDelco 18M391427 Professional Brake Master Cylinder Assembly

The ACDelco 18M391427 Professional Brake Master Cylinder Assembly is a premium-grade hydraulic brake component engineered to restore safe, reliable braking performance. Part of ACDelco's Professional (Gold) line, this master cylinder is built to meet or exceed original equipment standards for fit, form, and function.

Key Features:

• Aluminum and iron castings provide a robust, durable construction suited for demanding braking environments
• EPDM and SBR rubber seals — Ethylene Propylene (EPDM) and Styrene Butadiene (SBR) rubber internal components deliver superior resistance to heat, corrosion, and fluid leakage
• Bench bleed ready — ships pre-assembled and ready to bench bleed and install straight out of the box with no additional assembly required
• SAE J1153 and J1154 compliant — meets the brake performance requirements of these SAE standards for reliability and quality
• Pressure tested to ensure safe and confident braking before leaving the factory
• Geometrical tolerances ensure the body and plastic reservoir match for a proper, leak-free fit
• Piston assembly and return spring help prevent brake drag, reducing the risk of premature brake pad wear
• Backed by ACDelco's 12-month/unlimited-mile warranty

The ACDelco 18M391427 is a direct-replacement brake master cylinder assembly designed for a straightforward installation. Whether performing a routine brake system service or addressing a hydraulic failure, this ACDelco Professional assembly delivers dependable performance backed by General Motors engineering expertise.