Wilwood Left-Valve Chrome Compact Master Cylinder Kit with Integral Reservoirs, 7/8-inch Manual Bore

A chrome powder-coated Compact Tandem master anchors this 7/8-inch manual-brake kit. Its integral reservoirs and captured pushrod are complemented by a black left-side valve assembly, giving the shorter housing the same circuit-separation and rear-pressure adjustment functions. For the manufacturer Wilwood Engineering, disc brake system design and manufacturing encompass calipers, valves, fittings, master cylinders, brake lines and rotors. Bill Wood founded the Camarillo, California company in 1977. Its motorsport, specialized and street-performance applications rely on components selected with the complete brake assembly and its operating requirements in view.

Technical Details

• Manufacturer part number: 261-14961-P
• 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: Chrome powder 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, left-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

Verify pedal leverage and room for the 10.93-inch rod-equipped master as well as the valve beside it. Confirm full 1.10-inch stroke and complete return, then route the vehicle circuits to the valve's designated front and rear ports.

Manufacturer Documents

• Wilwood product specifications
• Wilwood FL162 instructions and specifications
• Wilwood DS1287 instructions and specifications
• Wilwood FL467 instructions and specifications
• Wilwood DS1178 instructions and specifications

The component must suit the completed installation. PMB Performance draws on over 20 years of experience to help you check the part identification, mating connections and required operating dimensions.