Wilwood 0.70-inch GS Master Cylinder with Integral 1.5-Ounce Reservoir

A seven-tenths-inch bore and built-in reservoir make this GS master a self-contained fluid-supply arrangement. It retains the GS family's threaded pedal rod and rebuildable black aluminum body, with an internal bellows beneath the cap. Founded in 1977 by Bill Wood, Wilwood Engineering carries out disc brake design and manufacturing from Camarillo, California. Its rotors, calipers, brake lines, master cylinders, fittings and valves serve motorsport, street-performance and specialized applications. Parts within that range must be matched to one another and to the requirements of the complete braking system.

Technical Details

• Manufacturer part number: 260-15097
• Material: Aluminum
• Cylinder bore: .70
• Pressure circuits: 1
• Stroke Length: 1.25 in
• Listed displacement per stroke: 0.48 cu in
• Reservoir Type: Integral
• Fluid capacity: 1.5 oz
• Flange-to-end length: 3.96
• Overall Length: Exact page: 7.99 inches; DS-1151 Figure 2 integral drawing: 7.85 inches. Confirm installed clearance.
• Mounting centers: 2.25"
• Pushrod dimensions: 3.37" x 5/16-24
• Finish: Black E-coat
• Pressure outlet: 3/8-24 inverted flare
• Fluid selection: DOT 3, DOT 4 or DOT 5.1 for performance use; DOT 5 silicone not recommended
• Reservoir package: Integral 1.5 oz chamber with sealed cap
• Outlet connection: 3/8-24 IF Female

Fitment & Compatibility

Provide cap-access clearance and confirm that 1.5 ounces of reservoir capacity is adequate for the system. Match the 0.48-cubic-inch specified output, 1.25-inch travel and 2.25-inch flange to the pedal and connected circuit. Use a suitable inverted-flare pressure line and preserve free piston return.

Manufacturer Documents

• Wilwood product specifications
• Wilwood DS1151 instructions and specifications
• Wilwood FL402 instructions and specifications
• Wilwood FL162 instructions and specifications

PMB Performance has more than 20 years of experience matching brake components. Share the actual mounting, linkage and hydraulic arrangement when requesting fitment assistance.