Product Summary

64-66 Ford Mustang, Disc/Disc Brake System Type

  • 7" Single black Mustang booster w/ firewall plate
  • 1-1/8" Bore master cylinder, 1/2-20" & 3/8-24" ports on left side only
  • Includes pre-bent lines to master cylinder
  • Built in residual valve for rear brakes
  • Mounting hardware included

Key Specs

MFG. Part #91664048
BrandSpeedway Motors
Brake System TypeDisc/Disc
Brake Booster Diameter7 Inch

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Speedway Motors 91664048 Details

This is one of our best selling power brake units for your early Mustang. Want to add power brakes but fear it will hit the shock towers? Not this unit! Sure to slip right in and clear under the hood and get the stopping power you deserve. Retain the OEM look and add power brakes to your Mustang today!

1964-1966 Ford Mustang Booster Conversion Kit (Disc/ Disc)

Conversion Kit Includes

  • 7" Single Black Mustang Booster w/ Firewall Plate
  • 1-1/8" Bore Master Cylinder
  • 2227161 Casting Number with Teardrop Markings
  • 1/2-20" & 3/8-24" Ports on left Side only
  • Bottom Mount Universal Disc/Disc Proportioning Valve Kit
  • Includes Pre-bent Lines to Master Cylinder
  • Built in Residual Valve for Rear Brakes
  • Zinc Bottom Mount Bracket
  • Mounting Hardware


Speedway Motors 91664048 Specifications

MFG. Part #91664048
BrandSpeedway Motors
Brake System TypeDisc/Disc
Brake Booster Diameter7 Inch
Brake Booster TypeVacuum Diaphragm Single
Outlet CountTandem
Outlet Fitting1/2"-20 & 3/8"-24
Master Cylinder Bore Size1-1/8 Inch
Master Cylinder Port Sizes3/8"-24 & 1/2"-20 IFF
Master Cylinder Built-In Residual ValvesYes
Master Cylinder Bail TypeSingle Bail
Mounting Bracket IncludedYes
Proportioning Valve IncludedYes
Proportioning Valve LocationBottom Mount
Reservoir IncludedYes
Sold in QuantityKit