Wilwood Black One-Inch Remote Tandem Master Kit with GM-Style Angled Reservoirs and Left Valve

The reservoirs are shaped to sit level when this black tandem master is installed at the specified 15-degree GM-style angle. The one-inch kit includes its left-mounted combination valve and preformed connecting tubes. 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: 261-16962-BK
• Material: Aluminum
• Cylinder bore: 1.00"
• 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: 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
• 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 actual mounting angle and slotted flange before installation. Check booster rod depth and both reservoir clearances; no universal GM vehicle fitment is claimed.

Manufacturer Documents

• Wilwood product specifications
• Wilwood DS1189 instructions and specifications
• Wilwood FL162 instructions and specifications
• Wilwood DS1178 instructions and specifications

With more than 20 years of experience, PMB Performance can help compare the specified part with the assembly you are servicing. Include the existing part identification and relevant hydraulic dimensions.