V-Twin Manufacturing Billet Chrome 5/8 Inch Wagner Master Cylinder Harley 1958-1979

V-Twin Manufacturing Billet Chrome 5/8 Inch Wagner Master Cylinder Harley 1958-1979

Upgrade your vintage Harley-Davidson braking system with the V-Twin Manufacturing Billet Wagner Style Rear Master Cylinder. This reproduction unit captures the classic silhouette of the original Wagner-Lockheed components while providing the superior durability and precision of modern billet aluminum construction. Finished in high-luster chrome, it serves as a functional centerpiece for restorations and custom chopper builds alike.

This master cylinder is specifically designed with a 5/8 inch bore, making it an ideal choice for custom applications requiring increased line pressure, such as multi-piston caliper setups. The compact billet body offers a cleaner look than traditional cast iron units without sacrificing the structural integrity required for heavy-duty braking. Whether you are maintaining a period-correct Electra Glide or building a one-off bobber, this unit delivers reliable performance and a show-quality finish.

Technical Specifications

• Brand: V-Twin Manufacturing
• Bore Size: 5/8 Inch
• Body Material: Billet Aluminum
• Finish: Chrome
• Mounting Holes: 3/8 Inch
• Mounting Center-to-Center: 2.25 Inches
• Mounting Offset: 3/8 Inch
• Inlet Size: 1/8-27 NPT
• Overall Length: 4 Inches
• Overall Width: 1.5 Inches
• Overall Height: 3.125 Inches

Key Features

• Billet Aluminum Construction: Offers superior strength and a cleaner aesthetic compared to original cast iron master cylinders.
• Classic Wagner Styling: Maintains the authentic look of 1958-1979 Harley-Davidson rear brake systems.
• High-Performance Bore: The 5/8 inch bore provides excellent leverage for modern multi-piston aftermarket calipers.
• Show-Quality Finish: Triple-chrome plated for long-lasting corrosion resistance and a mirror-like shine.
• Direct Replacement: Designed to mount to the original frame locations on Big Twin models.
• Custom Versatility: Perfect for frame-up builds requiring a compact, reliable rear master cylinder.

Installation and Fitment Notes

WARNING: This master cylinder uses a 5/8 inch bore. Verify your caliper requirements before installation; using a smaller bore with large calipers may result in excessive pedal travel. This unit is intended for use with DOT 5 brake fluid unless otherwise specified by your caliper manufacturer. For 1979 models, this unit fits early production runs only; please verify your mounting hole spacing (2.25 inches) prior to ordering. Bench bleeding is highly recommended before final installation to ensure all air is removed from the internal piston chamber.