A-Premium Front Drum Brake Wheel Cylinder for Volkswagen Beetle 1965–1979 & Karmann Ghia 1965–1966 — Cast Iron, Pressure‑Tested

Designed as a direct-fit replacement for vintage Volkswagen drum brake systems, this A-Premium front wheel cylinder fits select Beetle (1965–1979) and Karmann Ghia (1965–1966) models on both left and right sides. Made from cast iron with an M10 x 1.0 inlet thread and a measured inside piston diameter of 0.875 inches, the unit is pressure- and high-temperature-tested to ensure consistent performance under road conditions. It includes the bleeder screw but not the bleeder screw cap—please confirm your vehicle year and side before ordering.

Which Volkswagen models and years is this wheel cylinder compatible with?

This wheel cylinder is intended for classic Volkswagen drum brake front applications. It covers Beetle models from 1965 through 1979 and Karmann Ghia from 1965 to 1966 for both driver and passenger sides. Always verify part cross-references and your specific vehicle details before purchase.

• Fitment: Volkswagen Beetle (1965–1979) - front left and right
• Fitment: Karmann Ghia (1965–1966) - front left and right
• Reference numbers included: W90549, WC37109, 113611057, 131611057, 131611057A
• Confirm fit by entering vehicle info on the product listing page

What are the key specifications and hardware details?

The cylinder is cast iron with precise threading and piston sizing for reliable sealing and hydraulic action. It ships with the bleeder screw installed, but the small protective bleeder screw cap is not included. Dimensions and thread sizes are provided to help you confirm compatibility with existing brake lines and fittings.

• Material: cast iron for durability and wear resistance
• Inside piston diameter: 0.875 inch (approx. 7/8")
• Brake inlet thread: M10 x 1.0; thread diameter 10 mm
• Included hardware: bleeder screw (no bleeder screw cap)

How is this wheel cylinder tested and what reliability can I expect?

A-Premium performs rigorous pressure and thermal tests on each cylinder to simulate braking demands. Units are pressure-tested across a wide range and subjected to high-temperature exposures, helping ensure predictable hydraulic behavior and resistance to failure in typical operating conditions.

• Pressure test range: 0.2 MPa to 20 MPa for seal and body integrity
• High-temperature check at 120°C to assess thermal durability
• Manufactured and inspected to meet common OEM replacement tolerances
• Backed by a one-year unlimited-mileage guarantee from A-Premium

What should I know before installing this part on my vehicle?

Installation requires basic brake system knowledge and attention to cleanliness and proper torque. Replace rubber cups and springs as needed, bench-bleed the system if recommended, and always use new brake fluid to avoid contamination. Check local regulations and follow a safe bleeding procedure after installation.

• Inspect and replace accompanying rubber seals or boots if worn
• Use compatible brake fluid and bleed per manufacturer procedure
• Verify thread and hose fitting compatibility (M10 x 1.0 inlet)
• Confirm left/right orientation and vehicle year before fitting

Who is this for: This A-Premium front drum brake wheel cylinder suits classic Volkswagen owners, restorers, and independent mechanics seeking a reliable, tested replacement for Beetle and Karmann Ghia front brakes. It’s intended for people who need an OEM-style cast iron cylinder with clear fitment references and confidence from pressure and temperature testing. If you maintain vintage Volkswagens or perform brake overhauls, this cylinder is a practical direct-replacement option—just confirm vehicle details and inspect related hardware during installation.