Wilwood 261-13272-BK 7/8" Bore Tandem Master Cylinder Kit w/Valve Early Mustang

Vehicle Fitment

• Early Ford Mustang (1965-1973) - manual brake systems

Fitment Notes

• 7/8" bore size, black E-coated finish, integral reservoir
• Includes slotted flange bracket and rod assembly for simple installation
• Not compatible with power brake booster systems

Features

• 7/8" bore delivers ~0.600 in² piston area for strong manual braking
• Black E-coated aluminum body offers corrosion resistance and performance look
• Combo proportioning valve controls front/rear circuit balance
• Includes stainless fluid tubing with pre-installed nuts for clean routing
• Slotted flange bracket allows precise pushrod adjustment
• Simple bolt-on installation with no leftover hardware
• Durable design built for street and light-duty track use

Specifications

• Part Number: 261-13272-BK
• Bore Size: 7/8"
• Piston Area: 0.600 in²
• Stroke: 1.10"
• Reservoir Capacity: 8.0 oz (front), 4.8 oz (rear)
• Overall Length: 13.65"; Flange-to-end: 8.15"
• Finish: Black E-coat; Material: Aluminum

Included Components

• 1x Tandem master cylinder (7/8" bore)
• 1x Combination proportioning valve
• 1x Slotted flange mounting bracket
• Fluid tubing with fittings
• Mounting hardware (bolts, nuts)
• Rod assembly for pushrod attachment

Product Description

The Wilwood 261-13272-BK tandem aluminum master cylinder kit is engineered for early manual-brake Mustangs (1965-1973). Featuring a 7/8" bore and combo proportioning valve, it provides efficient fluid control for front and rear circuits.

Its black E-coated aluminum body, integrated reservoir, stainless tubing, and adjustable bracket make for a sleek, durable, and easy installation. With precise pushrod adjustment and reliable pressure balance, this kit delivers enhanced braking performance without modifying factory systems.