Product Summary

Universal Fit, Firewall Position, Natural

  • Corvette-style master cylinder has a 1-1/8" bore and can be used for multiple vehicles with either manual or power brakes
  • Large bore master cylinders offer less pressure but more volume, meaning if you have large bore calipers, the brake pedal doesn't have to travel as far to create the needed volume
  • Features two 3/8"-24 IFF ports on each side allowing multiple mounting options, plugs included for the side not used
  • 2 bolt mount spacing is 3-3/8" on center and can be modified if needed to adapt to your vehicle
  • Piston has a deep well for manual brakes/push rod, plunger slug is included to work with a power booster, threaded adjustment of booster rod will need to be made when used

Key Specs

MFG. Part #91031440
BrandSpeedway Motors

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Speedway Motors 91031440 Details

Corvette-style master cylinder has a 1-1/8" bore and is suited for disc/drum combinations. Features dual outlets so the plumbing can come out either side of the master cylinder. These master cylinders will work with manual or power brake systems. They come with a deep-well piston for manual brakes and an adapter to fill the deep well for use with a power booster.

  • 3/8"-24 IFF outlet ports
  • Plugs are included for the unused ports
  • Mount spacing is 3-3/8" on center
  • Works with power or manual brake systems

Note: Customers intending to use this as a manual brake pedal assembly should note that the pushrod and boot are not included.

Learn more about selecting the proper master cylinder for your vehicle by reading our tech article.Brake System Selection.


Speedway Motors 91031440 Specifications

MFG. Part #91031440
BrandSpeedway Motors
Brake System TypeDisc/Drum
Outlet CountTandem/Both Sides
Reservoir TypeIntegral
Master Cylinder Bore Size1-1/8 Inch
Master Cylinder MaterialSteel
Pushrods IncludedNo
Outlet Fitting3/8"-24 IFF
Overall Width4.25"
Overall Height5"
Mounted Length8.25"
Centerline of Holes3.38"
Sold in QuantityEach
NotesPushrod hole allows use with manual pedals and/or power boosters.9103190 STEEL port plug kit.