Wilwood Right-Valve Tandem Master Cylinder and Mustang Manual Pushrod Kit, Chrome Powder-Coated 1-1/8-Inch Bore

SKU: 261-15666-P

$535.43

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Product details

The right-mounted combination valve accompanies a chrome powder-coated, 1-1/8-inch Mustang master and manual pushrod. Select the input arrangement and larger bore with the actual pedal and caliper configuration. 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: 261-15666-P
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: 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, 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

Match the documented classic Mustang conversion. Ensure that the right-side tube assembly clears surrounding components and that the pedal provides the required piston movement.

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

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.