Wilwood Black 7/8-Inch Compact Tandem Master Kit with Right Valve Bracket and Pushrod

The right-side combination valve changes the packaging of this black 7/8-inch compact tandem kit. The operating pushrod is included, while bore choice and pedal alignment remain specific to the complete brake installation. 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: 261-15659-BK
• Material: Aluminum
• Cylinder bore: 7/8"
• Pressure circuits: 2
• Stroke Length: 1.10 in
• Reservoir Type: Integral tandem chambers, 7.8 and 4.7 oz
• Fluid capacity: 7.8 / 4.7 oz
• Flange-to-end length: 6.55"
• Overall Length: 10.93"
• Mounting centers: 3.22–3.40"
• Pushrod dimensions: 4.38" 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
• Kit contents: Master cylinder, right-side combination proportioning valve and bracket, formed stainless connecting tubes and mounting hardware
• Combination-valve functions: Adjustable rear pressure, isolated front/rear circuits, front-line junction and hydraulic brake-light switch

Fitment & Compatibility

Measure clearance for the right bracket and formed tubes. Confirm the pushrod connection and required pedal movement before final adjustment.

Manufacturer Documents

• Wilwood product specifications
• Wilwood FL162 instructions and specifications
• Wilwood DS1287 instructions and specifications
• Wilwood DS1178 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.