Wilwood Left-Bracket Master Cylinder and Valve Kit, Chrome Powder Coat, 1-inch High Volume Tandem

A chrome powder-coated master is paired with the black combination valve and left-side support in this one-inch kit. The preformed tubes link the two hydraulic circuits to the valve block without combining them. 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: 261-13269-P
• Material: Aluminum
• Cylinder bore: 1.00"
• 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: 8.76"
• Mounting centers: 3.22–3.40"
• 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

Match the one-inch bore to pedal leverage, booster assistance if present and caliper fluid demand. Check the slotted flange and left-side plumbing envelope; a pushrod is not included with this master configuration.

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

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.