Wilwood Compact Side-Lug Master and Reservoir Kit, 3/4-inch Bore, Black Aluminum

A three-quarter-inch bore gives this side-mount cylinder the specified 0.49-cubic-inch output within its 1.12-inch stroke. The package includes two plastic reservoir sizes, a remote inlet adapter and mounting components for arranging the fluid supply around the available space. Master cylinders are part of Wilwood Engineering's wider disc brake range, alongside calipers, rotors, valves, fittings and brake lines. Wilwood was founded in 1977 by Bill Wood and designs and manufactures its systems from Camarillo, California for motorsport, specialized and street-performance applications. Hydraulic sizing and mechanical compatibility remain decisions for the complete brake system.

Technical Details

• Manufacturer part number: 260-12385
• Material: Aluminum / Plastic
• Cylinder bore: 3/4"
• Pressure circuits: 1
• Stroke Length: 1.12 in
• Listed displacement per stroke: 0.49 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

Use a rigid pedal mount with the documented 3.00-inch lug spacing. Allow the pushrod to retract fully and select the 4.5- or ten-ounce reservoir according to circuit capacity. The hose in the kit feeds the reservoir inlet; pressure plumbing requires the appropriate NPT outlet fitting.

Manufacturer Documents

• Wilwood product specifications
• Wilwood DS944 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.