Wilwood black master cylinder with finned metal reservoir, black screw cap, bellows boot and threaded pushrod

Wilwood Single-Outlet Compact Master Cylinder with Body-Mounted Billet Reservoir, Black 15/16-Inch Bore

SKU: 261-17278-.94

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Product details

A direct-mounted aluminum reservoir supplies the 15/16-inch compact master in this package. The master has one hydraulic outlet, so the circuit arrangement must be selected to suit the complete pedal and brake installation. Wilwood Engineering, the Camarillo, California disc brake manufacturer founded by Bill Wood in 1977, designs and builds systems for specialized, motorsport and street-performance applications. The product range covers brake lines, valves, fittings, calipers, master cylinders and rotors. A replacement component must preserve the intended relationship between the system's hydraulic and mechanical parts.

Technical Details

  • Manufacturer part number: 261-17278-.94
  • Material: Aluminum master body and billet aluminum reservoir
  • Cylinder bore: 15/16"
  • Pressure circuits: 1
  • Stroke Length: 1.12 in
  • Listed displacement per stroke: 0.77 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

Match the 15/16-inch bore, vertical mounting flange and pushrod connection. Confirm full stroke and the correct NPT outlet adapter before assembling the circuit.

Manufacturer Documents

PMB Performance brings over 20 years of brake-system experience to component selection. Send the installed cylinder, pedal and connection details if you need help checking this configuration.