Wilwood Mustang Manual Compact Master Kit, Black 1-1/8-Inch Bore and Left Valve

A 1-1/8-inch tandem bore is combined with the manual Mustang pushrod in this black compact kit. Its left-mounted valve assembly requires suitable firewall clearance and correct routing for the two circuits. Founded by Bill Wood in 1977, Wilwood Engineering is based in Camarillo, California. The company designs and builds disc brake systems, with calipers, master cylinders, rotors, brake lines, fittings and valves serving street-performance, motorsport and specialized applications. Selecting an individual part requires checking how it works with the rest of the braking assembly.

Technical Details

• Manufacturer part number: 261-15545-BK
• Material: Aluminum
• Cylinder bore: 1-1/8"
• 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: 12.32"
• Mounting centers: 3.22–3.40"
• Pushrod dimensions: 5.75"
• 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, 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

Confirm the classic Mustang application, pedal ratio and full available stroke. Select this larger bore for the actual brake configuration.

Wilwood’s kit summary gives a 1964–1973 Ford/Mustang range, while the corresponding bare-master family identifies 1964–1972. Confirm the actual manual pedal, supplied eyelet and mounting geometry, particularly for 1973, before ordering.

Manufacturer Documents

• Wilwood product specifications
• Wilwood FL162 instructions and specifications
• Wilwood DS1287 instructions and specifications
• Wilwood DS1178 instructions and specifications
• Wilwood FL311 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.