Wilwood Compact Single-Outlet Master Cylinder Kit, Black 3/4-Inch Bore with Direct Billet Reservoir

This compact single-circuit master kit uses a 3/4-inch bore and a finned billet reservoir mounted directly to its inlet. The four-ounce aluminum reservoir replaces a separately mounted fluid supply in this configuration. Founded in 1977 by Bill Wood, Wilwood Engineering carries out disc brake design and manufacturing from Camarillo, California. Its rotors, calipers, brake lines, master cylinders, fittings and valves serve motorsport, street-performance and specialized applications. Parts within that range must be matched to one another and to the requirements of the complete braking system.

Technical Details

• Manufacturer part number: 261-16838-.75
• Material: Aluminum master body and billet aluminum reservoir
• Cylinder bore: 3/4"
• Pressure circuits: 1
• Stroke Length: 1.12 in
• Listed displacement per stroke: 0.49 cu in
• Reservoir Type: Direct-mounted reservoir on Compact Remote cylinder
• Fluid capacity: 4.00 oz
• Flange-to-end length: 3.37"
• Overall Length: 7.80"
• Mounting centers: 2.25"
• Pushrod dimensions: 4.00" x 5/16-24
• Finish: Black E-coat
• Inlet arrangement: 0.87-inch seating diameter with 11/16-20 internal thread; this is the reservoir feed, not the pressure outlet
• Pressure connection: 1/8-27 NPT outlet; select the appropriate pressure-line adapter
• Reservoir package: One directly mounted 4 oz Type III hard-anodized finned billet reservoir with cap and seals

Fitment & Compatibility

Confirm the 2.25-inch vertical mounting flange, pedal geometry and 5/16-24 pushrod connection. Check the native 1/8-27 NPT outlet and required circuit sizing.

Manufacturer Documents

• Wilwood product specifications
• Wilwood FL554 instructions and specifications
• Wilwood FL162 instructions and specifications

PMB Performance has more than 20 years of experience matching brake components. Share the actual mounting, linkage and hydraulic arrangement when requesting fitment assistance.