Raybestos MC390541 Element3 New Brake Master Cylinder 34mm Bore Aluminum

The Raybestos MC390541 is a brand-new Element3 brake master cylinder engineered for select GM trucks and SUVs, including Chevrolet Silverado, GMC Sierra, Chevrolet Tahoe, GMC Yukon, Chevrolet Suburban, and Cadillac Escalade. As a new—not remanufactured—unit, it delivers out-of-the-box reliability with no core charge required.

Key Features:

• Precision aluminum construction — lightweight yet durable, resists corrosion and does not stress the brake booster mounting
• 34.00mm bore size matches OE specification to prevent fluid bypass and maintain proper hydraulic pressure
• New piston assembly and return spring — prevents brake drag that can overheat calipers and rotors, extending pad life
• EPDM and SBR rubber components — meet SAE specifications, compatible with standard brake fluid, and resist heat and leakage
• Hardened zinc dichromate bleeder screws — trivalent coating for added corrosion protection and durability
• Two outlets with 1/2"-20 thread size — compatible with standard brake line fittings for straightforward installation
• Two mounting holes (0.413" diameter) — ensures a precise, secure fit to the firewall or brake booster
• Power brake compatible — designed for use with vacuum booster systems
• Integrated plastic reservoir with cap included — no separate reservoir purchase needed
• 100% pressure tested — each unit is end-of-line tested for leak-free, consistent performance

The Raybestos Element3 hydraulics line is engineered to match OE fit, form, and function. OEM cross-reference: General Motors 18060789. UPC: 829352175132.