Wilwood Compact Master Cylinder and Direct Billet Reservoir Kit, Black 13/16-Inch Bore

The 13/16-inch bore provides an intermediate hydraulic size in this compact single-circuit kit. Its finned four-ounce reservoir mounts directly to the master body, which uses a vertical flange and threaded pushrod. Since its founding by Bill Wood in 1977, Wilwood Engineering has designed and manufactured disc brake systems. Its Camarillo, California operation supplies master cylinders, brake lines, valves, rotors, fittings and calipers for specialized applications as well as motorsport and street-performance vehicles. Replacement and conversion parts need to match the complete braking arrangement.

Technical Details

• Manufacturer part number: 261-17277-.81
• Material: Aluminum master body and billet aluminum reservoir
• Cylinder bore: 13/16"
• Pressure circuits: 1
• Stroke Length: 1.12 in
• Listed displacement per stroke: 0.58 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

Verify bore selection and pedal alignment. Check the 2.25-inch mounting pattern, 1/8-27 NPT outlet and room to remove the reservoir cap.

Manufacturer Documents

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