Product Summary

Firewall Position, Disc Brake System Type, Natural

  • Disc / Disc only
  • 1" bore master cylinder
  • Has Ford style teardrop casting
  • Fits Ford bolt pattern only
  • Premium Cast iron construction, zinc-plated lid for rust and corrosion prevention
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Key Specs

MFG. Part #91664055
BrandSpeedway Motors
Master Cylinder Bore Size1 Inch
Master Cylinder MaterialCast Iron
FinishNatural
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Need To Know

Quick and Easy Returns

Return Policy

Speedway Motors 91664055 Details

Tired of seeing aftermarket master cylinders on Ford Mustangs? So are we. That's why were bringing back the correct casting number "Teardrop" master cylinder that doesn't look out of place in your engine compartment. Give your car a OEM style replacement master cylinder with the right valve for the job. Comes complete with the disc/disc valve and keeps your car stopping the way it should be. Stop fishtailing or nosediving with the wrong valve and get this easy to install kit and fix those braking problems for good!

1964-1973 Ford Mustang Master Cylinder kit

  • Disc/Disc
  • 1" Bore Master Cylinder
  • Ford Style Teardrop" Casting #227161
  • Fits Ford bolt pattern only
  • Cast iron with zinc lid

Original O.E.M. Style MCK7161 Embossed Mustang Lid Availalbe Here.

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Speedway Motors 91664055 Specifications

KEY SPECS
MFG. Part #91664055
BrandSpeedway Motors
Master Cylinder Bore Size1 Inch
Master Cylinder MaterialCast Iron
FinishNatural
GENERAL
PositionFirewall
Brake System TypeDisc
Outlet CountTandem
Reservoir TypeIntegral
Reservoir IncludedYes
Outlet Fitting3/8"-24 IFF
Outlet Fitting 29/16"-18 IFF
Sold in QuantityKit

Ratings & Reviews

4.8

8 Reviews

Overall Assessment

Customers are consistently satisfied with the product's quality and fit, specifically mentioning its seamless installation on several car models like Mustangs. It was praised for resolving brake issues and is acknowledged as a significant upgrade. The master cylinder was especially noted for fitting disc front and back for Ford, a feature not found commonly. The product's practicality and usability come highly recommended, marking it as a re-purchase item for motorists. Its unique facets provide it an edge over competitor products.

4.8

8 reviews

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Filter by Ratings

Prop. valve adapter sizes 69 power disc/disc - moving valve

3.0

8 months ago

69 393 stroker

Michigan

Verified

In order to use this in a 69, switching from POWER disc/drum to a POWER disc/disc just because i was regearing the rear end already...without modifying or changing all of the brake lines, the bracket for the proportioning valve cannot be used as shown or must have the front side cut off to get past the shock tower, and the corner 3/8 port for front brake goes directly into the shock tower. An adapter must be used to go to the rear 9/16 port from the factory 7/16 on the line. The front 1/2 lines also need adapters to go to the 3/8 ports. I am installing braided lines instead of the hard lines that come with the kit because they rub against the sheetmetal with how far they stick out and going to move the valve back to the fender area. Outputs from master cylinder ports are 1/2 - 20 to 7/16-24 for rear and 3/8-24 to 1/2-20 for the front. There is long enough factory line to bend where needed. This set up would probably fit if I was only running manual brakes and not power brakes with the booster.

Would Recommend

Excellent quality and construction

5.0

2 years ago

Mitch

St. Louis, Mo

Verified

Works great with recent 4 wheel disc brake install on 1966 Mustang

Would Recommend

I would buy this product again

5.0

2 years ago

Papa

Hilo Hawai'i

Verified

Brake

Perfect fit

5.0

3 years ago

None

Pa

Verified

Bolted right up no problem

Would Recommend

Product worked great.

5.0

3 years ago

Ray Ray

Fairfield Ca.

Verified

This product was installed in a Mustang and solved all issues we were having.

Would Recommend

I would buy this product again

5.0

5 years ago

RR1955

Jefferson NC

Verified

Great upgrade for my brakes

Would Recommend

Worked great

5.0

5 years ago

David Ruhs

Des Moines Iowa

Verified

I could not find a master cylinder to fit a Ford that was for disc front and back. This bolted right in and works great

Would Recommend

great fit

5.0

5 years ago

Marv Dude

Flint,TX

Verified

it fit great on my 67 mustang

Showing 8 of 8 reviews

Questions & Answers

3 Questions3 Answers

Will this handle 2003 13" cobra brakes retro fitted on a 73 model

by Comet

7 years ago

1 answer

Is this for manual or power brakes?

by Ken

7 years ago

1 answer

What is the mounting dimension bolt center to bolt center?

by jim

8 years ago

1 answer

3 of 3 questions shown

Fitment

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