Wilwood 1-1/8-Inch Chrome Powder-Coated Tandem Master Kit with Left Valve and Angled GM-Style Reservoirs

The chrome powder-coated master in this 1-1/8-inch tandem kit is packaged with angled reservoirs, a combination valve and left bracket. The reservoir arrangement requires the specified GM-style mounting angle and a suitable installation envelope. 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: 261-16963-P
• Material: Aluminum
• Cylinder bore: 1-1/8"
• Pressure circuits: 2
• Reservoir Type: Angled direct-mount containers on Remote Tandem cylinder
• Fluid capacity: 7.8 / 4.7 oz
• Flange-to-end length: 6.56"
• Overall Length: 7.16"
• 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
• Travel check: DS-1189 specifies 1.12-inch stroke and also states 1.10 inches in its full-travel warning; verify actual full piston travel before the pedal reaches a stop
• Reservoir package: Direct-mounted angled reservoirs, 7.8 and 4.7 oz, with tops level when the master is tilted upward 15 degrees

Fitment & Compatibility

Confirm the 15-degree mounting geometry. Match booster engagement, reservoir clearance and hydraulic sizing to the installed brake assembly.

Manufacturer Documents

• Wilwood product specifications
• Wilwood DS1189 instructions and specifications
• Wilwood FL162 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.