Wilwood Bare High-Volume Tandem Master, 15/16-inch Bore, Without Pushrod

This fifteen-sixteenths-inch high-volume master is the rodless version of the oval-reservoir tandem design. Its bare aluminum housing supports a compatible separate actuator and retains the dual fluid chambers and alternate side outlets. Master cylinders are part of Wilwood Engineering's wider disc brake range, alongside calipers, rotors, valves, fittings and brake lines. Wilwood was founded in 1977 by Bill Wood and designs and manufactures its systems from Camarillo, California for motorsport, specialized and street-performance applications. Hydraulic sizing and mechanical compatibility remain decisions for the complete brake system.

Technical Details

• Manufacturer part number: 260-18184
• Material: Aluminum
• Cylinder bore: 15/16"
• Pressure circuits: 2
• Stroke Length: 1.10 in
• Reservoir Type: Integral
• Fluid capacity: 8.0 / 4.8 oz
• Flange-to-end length: 8.15"
• Overall Length: 8.76"
• Mounting centers: 3.22–3.40"
• Finish: Bare
• Native pressure ports: 1/2-20 at both circuits; use the correct included outlet adapters and seal washers
• Circuit outlet adapters: Primary: 3/8-24 or 1/2-20 inverted flare; secondary: 3/8-24 or 9/16-18 inverted flare
• Hydraulic relationship: Equal pressure output from the two circuits before external proportioning; 2:1 primary/secondary volume relationship
• Service: Factory rebuild only; do not disassemble the tandem piston assembly

Fitment & Compatibility

Wilwood identifies suitable manual and power-assisted applications, subject to actuator and hydraulic matching. Check the piston recess, complete 1.10-inch travel and 3.22–3.40-inch mounting span. The pressure adapters and plugs are supplied, but the correct pedal rod or booster interface must be provided for the installation.

Manufacturer Documents

• Wilwood product specifications
• Wilwood DS487 instructions and specifications
• Wilwood FL162 instructions and specifications

PMB Performance offers over 20 years of parts and brake-fitment experience. For a compatibility check, provide the existing assembly and the dimensions that govern the replacement.