Product Summary

Universal Fit, Firewall Position, Tandem Outlet Count

  • Features the latest improvements in pressure actuation and fluid control
  • Designed to simply bolt on to most Chrysler, Corvette, GM, and Ford Mustang bolt patterns
  • Available in three bore sizes: 7/8" , 1" or 1-1/8"
  • Valve and bracket are black E-coated for a great look and long lasting durability
  • Stainless steel button head fasteners thread into the bracket for a simple installation and long-lasting durability

Key Specs

MFG. Part #261-13269-BK

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Wilwood has packaged the popular Aluminum Tandem Chamber Master Cylinder with the Combination Proportioning Valve, mounting bracket, fluid tubes and mounting hardware in a kit. Tandem Master Cylinder represents the latest in refinements in brake pressure actuation and fluid control. The slotted flange mounting makes it a simple bolt on for many OE mounts including the popular Chrysler, Corvette, GM, and Ford Mustang bolt patterns and is compatible with manual or power brake system applications. Master cylinders are available in three bores sizes, 7/8" , 1" or 1-1/8" , and three finishes, standard, ball burnished or black E-coat. The combination proportioning valve substantially simplifies wiring and brake proportioning adjustments on vehicles with custom brake systems. The combination block maintains full isolation between front and rear fluid circuits and is specifically designed to accompany the Tandem Chamber Master Cylinder. The combo valve and bracket are black E-coated for a performance look and long lasting durability. Stainless steel fluid tubes are precision bent with preinstalled stainless tube nuts for a simple bolt-on installation between the Combination Proportioning Valve and the Wilwood Tandem Master Cylinder. Stainless steel button head fasteners thread into the bracket for a simple installation and years of durable, rust-free performance. Simply connect the fluid lines, bleed the system, and you're finished.


MFG. Part #261-13269-BK
Brake System TypeDisc
Outlet CountTandem
Reservoir TypeIntegral
Master Cylinder Bore Size1 Inch
Master Cylinder MaterialAluminum
FinishEDP Coated
Reservoir IncludedYes
Number of Mounting Holes2
Reservoir MaterialAluminum
Reservoir Size (cu in)14.4 or 8.7
Fluid Capacity8.0 / 4.8 fl oz.
Area0.78 sq. in.
Master Cylinder Cap IncludedYes
Hardware IncludedYes
Pushrods IncludedNo
Mounting Bracket IncludedYes
Outlet Fitting3/8"-24 IFF or 1/2"-20 IFF
Outlet Fitting 23/8"-24 IFF or 9/16"-18 IFF
Overall Length8.76"
Mounted Length8.15"
Centerline of Holes3.2"
Sold in QuantityKit
GTIN Code889545068085