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Product details
This 7/8-inch tandem master supplies the pushrod needed to connect a suitable manual-brake pedal. The black E-coated housing contains separate 8.0 and 4.8 oz reservoir chambers and offers left- or right-side outlet routing. Wilwood Engineering designs and manufactures disc brake systems in Camarillo, California. Bill Wood founded the company in 1977; its range now encompasses calipers, rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized applications. Each component must suit the hydraulic and mechanical requirements of the complete system.
Technical Details
- Manufacturer part number: 260-9439-BK
- Material: Aluminum
- Cylinder bore: 7/8"
- 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: 12.26"
- Mounting centers: 3.22–3.40"
- Pushrod dimensions: 4.11" x 3/8-24
- 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
Match the 3/8-24 rod to the pedal clevis and confirm pedal leverage for the installed brakes. The slotted flange accepts 3.22–3.40-inch spacing; ensure the linkage does not bottom out or hold the piston away from its return position.
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.
