Wilwood Black 1-1/8-inch Tandem Master with Manual Pushrod and Remote Reservoir Kit

A one-and-one-eighth-inch bore and included threaded rod identify this black pushrod-equipped Remote Tandem master. Its pair of seven-ounce reservoirs supplies the two chambers through separate low-pressure feeds instead of a cast-in reservoir above the housing. Founded in 1977 by Bill Wood, Wilwood Engineering carries out disc brake design and manufacturing from Camarillo, California. Its rotors, calipers, brake lines, master cylinders, fittings and valves serve motorsport, street-performance and specialized applications. Parts within that range must be matched to one another and to the requirements of the complete braking system.

Technical Details

• Manufacturer part number: 260-14389-BK
• Material: Aluminum / Plastic
• Cylinder bore: 1-1/8"
• Pressure circuits: 2
• Reservoir Type: Remote
• Fluid capacity: 7.0 / 7.0 oz
• Flange-to-end length: 6.56"
• Mounting centers: 3.22–3.40"
• Pushrod dimensions: 4.23" 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
• Travel check: DS-1189 specifies 1.12-inch stroke and also states 1.10 inches in its full-travel warning; verify actual full piston travel before the pedal reaches a stop
• Reservoir feed: 0.87-inch inlet seating diameter with 11/16-20 internal thread; 1/4-inch feed-hose adapters for the standard remote reservoirs
• Reservoir package: Two 7 oz reservoirs with caps, brackets, clamps, hoses and feed adapters for direct or remote mounting
• Housing envelope: 7.16 inches as listed, excluding the projecting operating rod; verify the complete rod-equipped length

Fitment & Compatibility

Provide sufficient room for the complete rod-equipped assembly and allow full, unimpeded piston motion. The slotted flange spans 3.22–3.40 inches, but mounting alone does not establish hydraulic suitability. Connect the primary and secondary circuits as instructed, using the appropriate supplied adapters and plugs.

Manufacturer Documents

• Wilwood product specifications
• Wilwood DS1189 instructions and specifications
• Wilwood FL428 instructions and specifications
• Wilwood FL162 instructions and specifications

PMB Performance has more than 20 years of experience matching brake components. Share the actual mounting, linkage and hydraulic arrangement when requesting fitment assistance.