Wilwood 261-13270-P Aluminum Tandem M/C Kit 1.125in Bore w/Prop Valve

Vehicle Fitment

• Universal - slotted flange mounting bolts to many common OE mounting patterns, including Chrysler, Corvette, GM, and Ford Mustang bolt patterns
• Compatible with manual or power brake system applications

Fitment Notes

• This is a universal-application master cylinder, not built for one specific vehicle - confirm your brake pedal ratio, system type (manual vs. power), and mounting bolt pattern match before ordering.
• Available in four bore sizes (7/8 in., 15/16 in., 1.00 in., 1-1/8 in.) - this listing is the 1-1/8 in. (1.125 in.) bore version. Confirm bore size matches your brake system's requirements, as bore size affects pedal feel and fluid displacement.
• Also available in standard, ball burnished, or black E-coat finishes - this listing is the ball burnished (polished) finish.
• Carries a California Proposition 65 warning.

Features

• Aluminum tandem (dual-chamber) master cylinder for reliable brake pressure actuation and fluid control
• Includes a combination proportioning valve, simplifying wiring and brake proportioning adjustments on custom brake systems
• Slotted flange mounting for simple bolt-on installation to common OE mount patterns
• Ball burnished (polished) aluminum finish
• Integral dual-bowl reservoir with cap included
• Mounting bracket and hardware included for a complete kit

Specifications

• Type: Tandem (dual-chamber) master cylinder
• Bore Size: 1.125 in. (1-1/8 in.)
• Stroke: 1.100 in.
• Material: Aluminum
• Finish: Ball burnished (polished)
• Reservoir: Integral, aluminum, natural finish
• Outlet Quantity: 2 (1/2 in.-20 each)
• Mounting Flange Center-to-Center: 3.200 in.
• Mounting Holes: 2
• Power Brake Compatible: Yes
• Pushrod Included: No

Included Components

• 1x Aluminum Tandem Master Cylinder
• 1x Combination Proportioning Valve
• 1x Mounting Bracket
• Fluid Tubes
• Mounting Hardware
• 1x Reservoir Cap

Product Description

The Wilwood 261-13270-P is a complete aluminum tandem master cylinder kit built around a 1-1/8 in. bore, packaged with Wilwood's combination proportioning valve, mounting bracket, fluid tubes, and hardware for a custom brake system build or upgrade. The tandem (dual-chamber) design provides reliable, independent front and rear circuit actuation.

The slotted flange mounting is designed to bolt directly to several common OE mounting patterns - including Chrysler, Corvette, GM, and Ford Mustang layouts - making it a practical option for hot rod, muscle car, and custom brake system builds rather than a single specific vehicle. It works with both manual and power brake setups.

Because this master cylinder is sized by bore diameter rather than by vehicle, confirming your system's bore size requirement, pedal ratio, and mounting bolt pattern before ordering is essential - an incorrect bore size will affect pedal feel and stopping performance even though the physical part may still bolt up.