Wilwood Black 15/16-inch High-Volume Master Cylinder, Tandem Reservoir, No Rod

Black e-coat finishes this high-volume tandem master, supplied without a pedal pushrod. The fifteen-sixteenths-inch bore gives it a different hydraulic requirement from the one-inch and larger rodless versions despite a familiar oval reservoir shape. Wilwood Engineering serves motorsport, specialized and street-performance applications through disc brake system design and manufacturing. Bill Wood founded the company in 1977, and it is based in Camarillo, California. The range spans valves, rotors, fittings, calipers, brake lines and master cylinders; the installed braking assembly determines the appropriate combination of parts.

Technical Details

• Manufacturer part number: 260-18184-BK
• 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: Black E-coat
• 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

Verify the existing manual or assisted actuator reaches the piston recess correctly without preload. Keep the full 1.10-inch stroke available before any pedal stop and allow complete return. Route the circuits by effective brake piston area and select any proportioning or residual valves separately.

Manufacturer Documents

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

PMB Performance brings over 20 years of brake-system experience to component selection. Send the installed cylinder, pedal and connection details if you need help checking this configuration.