Wilwood Black Tandem Brake Master with Pushrod, 15/16-inch High-Volume Bore

This black-finished master pairs a manual pushrod with a dual-chamber high-volume reservoir. The 15/16-inch bore is one part of the brake-system calculation: pedal leverage, caliper area and available travel determine whether it is appropriate for the installation. Wilwood Engineering designs disc brake systems and manufactures a range of calipers, master cylinders, valves, fittings, rotors and brake lines. Founded in 1977 by Bill Wood, the Camarillo, California company serves specialized, street-performance and motorsport applications. Component selection requires understanding the brake assembly as a whole, including its hydraulic sizing and mechanical interfaces.

Technical Details

• Manufacturer part number: 260-13375-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: 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

The slotted flange accommodates 3.22–3.40-inch bolt centers. Route the primary circuit to the axle with greater effective caliper piston area as directed in the instructions, and use the included plugs in unused side ports. The 2:1 volume output ratio is not an adjustable front-to-rear pressure bias.

Manufacturer Documents

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

For help choosing the correct service or conversion component, contact PMB Performance with the existing brake-system details. Our team has over 20 years of experience working through parts and fitment requirements.