Wilwood 7/8-inch Side-Mount Compact Master Cylinder Kit with Remote Reservoir Hardware

The seven-eighths-inch Compact cylinder mounts through side lugs, leaving the rear of the body free from an end flange. Its single outlet and supplied reservoir choices suit a custom hydraulic circuit when the bore, pedal leverage and available travel have been matched. Wilwood Engineering serves motorsport, specialized and street-performance applications through disc brake system design and manufacturing. Bill Wood founded the company in 1977, and it is based in Camarillo, California. The range spans valves, rotors, fittings, calipers, brake lines and master cylinders; the installed braking assembly determines the appropriate combination of parts.

Technical Details

• Manufacturer part number: 260-12387
• Material: Aluminum / Plastic
• Cylinder bore: 7/8"
• Pressure circuits: 1
• Stroke Length: 1.12 in
• Listed displacement per stroke: 0.67 cu in
• Reservoir Type: Remote
• Flange-to-end length: 3.37"
• Overall Length: 8.84"
• Mounting centers: 3.00 inches, side mount
• Pushrod dimensions: 5.01" 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: 4.5 and 10 oz plastic reservoir bodies, cap, remote hose, adapters, clamps and bracket hardware
• Fluid selection: DOT 3, DOT 4 or DOT 5.1 for racing/performance use; DOT 5 silicone is not recommended for those uses

Fitment & Compatibility

Check the three-inch mounting-center distance and 5/16-24 pushrod connection before choosing this side-mount version. Both direct and remote reservoir layouts are documented in DS944. Provide suitable space for the chosen 4.5- or ten-ounce container and keep the supply hose away from heat.

Manufacturer Documents

• Wilwood product specifications
• Wilwood DS944 instructions and specifications
• Wilwood FL162 instructions and specifications

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.