Wilwood Left-Bracket Chrome Master Cylinder Kit for Classic Mustang, 15/16-inch Tandem with Eyelet

The chrome powder-coated 15/16-inch cylinder in this kit is paired with a Mustang-style eyelet pushrod. A black combination valve mounts on the left, and the included stainless tubes join it to the two independent master circuits. 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: 261-14158-P
• Material: Aluminum
• Cylinder bore: 15/16"
• Pressure circuits: 2
• Stroke Length: 1.10 in
• Reservoir Type: Integral
• Fluid capacity: 8.0 / 4.8 oz
• Flange-to-end length: 8.15"
• Overall Length: 13.65"
• 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, 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 early Ford Mustang manual linkage and the corresponding master's 1964–1972 family application. For cars with altered pedals or brakes, verify rod travel, pedal ratio and displacement directly before adjusting the rear-pressure valve.

Manufacturer Documents

• Wilwood product specifications
• Wilwood DS985 instructions and specifications
• Wilwood FL331 instructions and specifications
• Wilwood FL162 instructions and specifications
• Wilwood DS487 instructions and specifications

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.