Product Summary

57-77 Ford, Vacuum Diaphragm Dual Brake Booster Type

  • 8" Dual Power Brake Booster
  • Ford Truck Booster Brackets
  • Power Booster Rod Extension
  • 1" Dual Reservoir Master Cylinder
  • This kit does not come with a valve. You should be able to use existing valve on the truck and plumb it to the master using the 2 ports (1) 1/2-20 & (1) 9/16-18 on left side.
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Key Specs

MFG. Part #91664222
BrandSpeedway Motors
Brake Booster Diameter8 Inch
Master Cylinder MaterialCast Iron
Master Cylinder FinishNatural
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Speedway Motors 91664222 Details

  • 8" Dual Power Brake Booster
  • Ford Truck Booster Brackets
  • Power Booster Rod Extension 
  • 1" Dual Reservoir Master Cylinder
  • This kit does not come with a valve. You should be able to use existing valve on the truck and plumb it to the master using the 2 ports (1) 1/2-20 & (1) 9/16-18 on left side.
  • When using this kit you will not be using the mechanism in the bracket assembly as shipped. Remove it and use the pedal rod extension in the kit.
  • Firewall plate will not be used as it is designed for the lever mechanism and not the truck rod in this kit.

Speedway Motors 91664222 Specifications

KEY SPECS
MFG. Part #91664222
BrandSpeedway Motors
Brake Booster Diameter8 Inch
Master Cylinder MaterialCast Iron
Master Cylinder FinishNatural
GENERAL
Brake Booster TypeVacuum Diaphragm Dual
Outlet CountTandem
Outlet Fitting1/2" & 9/16" IFF
Master Cylinder Bore Size1 Inch
Brake Booster MaterialSteel
Brake Booster FinishPowder Coated
Master Cylinder Port Sizes1/2"-20 & 9/16"-18 IFF
Master Cylinder Built-In Residual ValvesNo
Master Cylinder Cap IncludedYes
Master Cylinder Bail TypeDouble Bail Wire Zinc Lid
Mounting Bracket IncludedYes
Brake Booster Bracket FinishBlack Powder Coated
Proportioning Valve IncludedNo
Brake Pedal Rod IncludedYes
Reservoir IncludedYes
Sold in QuantityKit
NotesREPLACEMENT BLACK 8" DUAL BOOSTER 91664079 3-3/8 X 3-3/8 BOLT PATTERN FIRE WALL,M8-1.25 STUDS
GTIN Code635648187891

Ratings & Reviews

4.4

14 Reviews

Overall Assessment

Our product's quality and usability are highly commended with many customers suggesting a perfect fit for the Ford 350 and Ford F100, 1968 model. Its performance has elicited positive reactions from buyers, praising its functionality especially for braking efficiency even with drums. The material quality appears superior with customers electing to re-purchase it over mounting their own kits, despite occasional fitment issues. The product evidently outshines competitors as it enhances safety and provides excellent performance.

4.4

14 reviews

5

9

4

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3

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Most Liked Positive Review

4.0

Nice stuff. I'd buy again

Ok. Everything fit together well. Bolted on truck fine. BUT. Needed to maje a ne firewall plate with new, smalker center hole, in new location to alight Everything and use the provided seal. Had to cut 2.5 inches out of actuator rod as it was way to long as well. But all in all. Pretty slick kit

Most Liked Negative Review

1.0

Not even close to fitting.

It doesn't even come close to fitting. With the brackets bolted on the firewall of my '64 F100, the booster studs are 2" from the holes on one side. I also had 2 pieces missing from my kit. The mounting brackets are worthless, I would have been better off making my own kit.

Filter by Ratings

needing a brake

5.0

2 months ago

drunkard

bedford

Verified

bought this kit or a frankenstein of a 48 f100 with very little work and modding this kit fit like it was made for it

Would Recommend

This kit works but you have to work to make it work

4.0

2 months ago

Cobra 1

VA

Verified

The kit comes with almost everything needed to directly bolt it on and go. You will need to buy adapter fittings to go from the master cylinder to your vehicles brake lines. You will also have to cut the sleeve that goes from the pedal to the booster so it will fit properly.

Would Recommend

Yes

5.0

2 months ago

Lil lee

North Carolina

Verified

I got brakes now

Would Recommend

Solid Product - Included EVERYthing

5.0

5 months ago

Austin

Staten Island, NY

I never write reviews, but this kit was well put together, and even included the proper brackets for bolting to the firewall. It came with all the necessary plugs and fittings, and didn't require several trips to the parts store like everything else I've ever ordered in my life.

Would Recommend

Worked out

5.0

5 months ago

Keater

Tennessee

Verified

Worked out great. I did have to shim it out a little bit but nothing a washer couldn't fix's

Would Recommend

Great buying experience

5.0

9 months ago

Poolboyy72

Rocklin, Ca

Verified

I bought a power brake kit for my 1959 Ford F100

Would Recommend

Yes

5.0

9 months ago

Sam

Texas

Verified

Awesome

Would Recommend

Nice stuff. I'd buy again

4.0

12 months ago

Ctb arts

Spokane WA

Verified

Ok. Everything fit together well. Bolted on truck fine. BUT. Needed to maje a ne firewall plate with new, smalker center hole, in new location to alight Everything and use the provided seal. Had to cut 2.5 inches out of actuator rod as it was way to long as well. But all in all. Pretty slick kit

Would Recommend

I would probably use this unit again

4.0

a year ago

Michigan car guy

Lowell Michigan

Verified

I installed this in my project truck. I'm a long way from getting my project on the road. My only negative is the rod that connects the booster to the brake pedal was too long, I was thus unable to use it, however I was able to come up with a clean solution with parts from my local hardware.

Would Recommend

A great upgrade

5.0

2 years ago

Wyomingjy

Laramie, Wyoming

Verified

Easy enough to install, it would have nice to have some some basic instructions, but easy enough to figure out. A very nice upgrade !

Would Recommend

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Showing 10 of 14 reviews

Questions & Answers

2 Questions • 2 Answers

Is this the correct brake booster for 4 wheel drums? For a 1963 f100 2wd.

by Ryan

• 2 years ago

1 answer

Is this compatible with 4 wheel disk brakes?

by Chad

• 3 years ago

1 answer

2 of 2 questions shown

Fitment

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