Dual Circuit Master Cylinder, Fits Super Beetles

OVERVIEW

When it comes to the safety and stopping power of your air-cooled Volkswagen, the master cylinder is the heart of the entire hydraulic system. This EMPI Dual Circuit Master Cylinder is specifically engineered for the unique demands of the Super Beetle, providing a significant upgrade in reliability and performance over aging stock units. Unlike the single-circuit systems found on early vintage models, this dual-circuit design offers a critical safety redundancy: it separates the front and rear braking systems into two independent hydraulic paths. This means that in the unlikely event of a leak or pressure loss in one circuit, the other remains functional, allowing you to bring your vehicle to a controlled stop. Whether you are restoring a classic daily driver or building a high-performance street machine, this master cylinder delivers the firm, predictable pedal feel that every VW enthusiast demands.

One of the most important considerations for modern Super Beetle owners is the transition from drum brakes to disc brakes. If you are planning to install, or have already installed, a 4-wheel disc brake conversion kit, this high-volume master cylinder is an absolute necessity. Standard factory master cylinders typically feature a smaller bore size that simply cannot move enough fluid to properly actuate four disc brake calipers. This EMPI unit features a precision-machined 20.6mm bore, which provides the increased hydraulic volume required to eliminate the "spongy" pedal feel often associated with disc brake swaps. By ensuring that your calipers receive the pressure they need to bite hard and fast, this master cylinder transforms your braking system from a point of concern into a point of confidence, making it one of the most vital upgrades for any Super Beetle owner looking to modernize their ride.

FITMENT

• Volkswagen Super Beetle (Sedan): 1971, 1972, 1973, 1974, 1975, 1976, 1977
• Volkswagen Super Beetle (Convertible): 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979
• Model Compatibility: Fits both 1302 and 1303 chassis configurations.
• Brake System Compatibility: Ideal for 4-wheel disc brake conversions and heavy-duty drum applications.

SPECS

• Brand: EMPI
• Part Number: 17-2808-0
• Bore Size: 20.6mm (High Volume)
• Circuit Type: Dual Circuit (Front and Rear separation)
• Material: High-strength cast iron housing for maximum durability.
• Finish: Protective coating to resist corrosion and brake fluid degradation.
• Port Size: Standard M10 x 1.0 threaded outlets.
• Installation: Direct bolt-on replacement for factory Super Beetle master cylinders.
• Weight: Approximately 2.9 lbs.

PRO TIPS

1. Always Bench Bleed Before Installation

Never install a master cylinder directly onto the car without bench bleeding it first. Air trapped inside the internal piston chambers is incredibly difficult to remove once the unit is mounted in the vehicle, especially in the tight confines of a Super Beetle''s trunk area. Use a bench bleeding kit to cycle fresh brake fluid through the master cylinder until all air bubbles have disappeared from the clear return lines. This ensures a rock-solid pedal right out of the gate and prevents the frustration of pumping the pedal for hours trying to chase down a soft spot in the lines.

2. Verify Pushrod Clearance

When installing a new master cylinder, it is vital to check the clearance between the brake pedal pushrod and the master cylinder piston. There should be approximately 1mm of free play (roughly 1/16 of an inch) before the rod makes contact with the piston. If the pushrod is too long and keeps constant pressure on the piston, the return ports inside the master cylinder will remain closed. This prevents the brake fluid from returning to the reservoir as it heats up, which can cause your brakes to "drag" or even lock up completely while driving. Always double-check this adjustment to ensure the system can vent properly.

3. Use High-Quality DOT 3 or DOT 4 Fluid

For most air-cooled Volkswagens, especially those with new master cylinders and rubber lines, a high-quality DOT 3 or DOT 4 glycol-based brake fluid is recommended. While some enthusiasts are tempted by Silicone DOT 5 fluid because it doesn''t damage paint, it is much harder to bleed and can lead to a "spongy" pedal feel because it compresses more than glycol-based fluids. Additionally, never mix different types of fluid. If you are upgrading your master cylinder, it is the perfect time to flush the entire system with fresh fluid to remove contaminants and moisture that could cause internal corrosion in your new EMPI unit.