Wilwood One-Inch Compact Side-Mount Master Kit, Single Outlet, Dual Reservoir Choice

This one-inch-bore master delivers the stated 0.87-cubic-inch volume through a single pressure port. The short body attaches by two integral side lugs and comes with the reservoir equipment needed for either an on-body or remote fluid supply. 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: 260-12388
• Material: Aluminum / Plastic
• Cylinder bore: 1.00"
• Pressure circuits: 1
• Stroke Length: 1.12 in
• Listed displacement per stroke: 0.87 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

Match the cylinder to a three-inch side-lug mount and the brake circuit's required displacement. The 5/16-24 pushrod must move freely throughout its stroke and return without obstruction. Reservoir-feed fittings and hose do not replace the pressure-rated line connection at the 1/8-27 NPT outlet.

Manufacturer Documents

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