Product Summary

Universal Fit, Firewall Position, Tandem Outlet Count

  • 1" bore is designed to be used in manual and power assisted applications
  • Stroke is set at 1.10" with a volume ratio of 2:1 between the primary and secondary chambers
  • Machined from high-pressure die castings and weighs only 3 lbs.
  • Features a black EDP finish of added style and rust protection
  • Has an overall length of 8.76" and the mounted length measures 8.15"

Key Specs

MFG. Part #260-8555-BK

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Wilwood's Tandem Aluminum Master Cylinder is available in 4 bore sizes, 7/8" , 15/16" , 1.00" and 1.125" ; and 3 finishes, plain, ball burnished and black e-coat. 7/8" & 15/16" bore master cylinders are designed primarily for manual applications and include a pushrod. The 1" bore can be used in manual and power assisted applications and does not come with a pushrod. The 1.125" bore is designed for use primarily with power brake applications, either from vacuum assist or hydraulic assist systems. They're designed for mount flanges from 3.22" to 3.40" , common measurements for most domestic cars and trucks from the mid 1960s to present, and offer fluid outlet ports on both sides of the bore. The stroke is set at 1.10" with a volume ratio of 2:1 between the primary and secondary chambers. Machined from high-pressure die castings, each master cylinder weighs only 3lbs, a 75% weight savings over most cast iron OE type master cylinders. We also offer a our combination proportioning valve kit, which includes brackets and stainless lines specifically for use with these master cylinders, see PN 260-13190, or 220-13189 for retrofit kit.



MFG. Part #260-8555-BK
Brake System TypeDisc
Outlet CountTandem
Reservoir TypeIntegral
Master Cylinder Bore Size1 Inch
Master Cylinder MaterialAluminum
FinishEDP Coated
Reservoir IncludedYes
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 IncludedNo
Pushrods IncludedNo
Mounting Bracket IncludedNo
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 Holes3.22"
Sold in QuantityKit
GTIN Code889545067965