Single Diaphragm Chrome Booster Master Cylinder Combo
Single Diaphragm Chrome Booster Master Cylinder Combo
Speedway Motors

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#91031451

Single Diaphragm Chrome Booster Master Cylinder Combo

  • These show-quality brake combos come with a 7" single diaphragm chrome plated steel booster and a chrome master cylinder
  • Master Cylinder has a 1" bore and dual 3/8"-24 IFF outlets (on both sides)
  • New single diaphragm booster measures 7" in diameter and is the smallest size offered which fits well in tight spaces
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$336.99

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$342.98

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Product Summary

Universal Fit, 7 Inch Brake Booster Diameter, Chrome

  • These show-quality brake combos come with a 7" single diaphragm chrome plated steel booster and a chrome master cylinder
  • Master Cylinder has a 1" bore and dual 3/8"-24 IFF outlets (on both sides)
  • New single diaphragm booster measures 7" in diameter and is the smallest size offered which fits well in tight spaces
  • Booster has four bolts on 3 3/8" centers which fits a variety of mounting brackets and pedal assemblies
  • Assembled length is 12" from booster mount flange to the end of the master cylinder

Comes as a Kit

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Key Specs

MFG. Part #91031451
BrandSpeedway Motors
Brake Booster Diameter7 Inch
Master Cylinder MaterialSteel
Master Cylinder FinishChrome
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Speedway Motors 91031451 Details

These show-quality brake combos come with a 7" single diaphragm chrome plated steel booster and a chrome master cylinder with a 1" bore and dual 3/8"-24 IFF outlets (on both sides). Includes plugs for unused ports.

Suitable for use with front disc/rear drum brake systems.

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

Charts

Specs

  • 3-3/4" thick from master cylinder mount face to firewall mount face
  • 4" long firewall mount face to end of pushrod
  • Booster mounts to bracket or body with four bolt square pattern on 3-3/8" centers
  • Pushrod stud is 3/8" fine thread
  • Master cylinder studs are two 3/8" coarse studs across from each other on 3-3/8" centers
  • Opening of booster on master cylinder side for master cylinder snout or flange to fit into is 1.620"
  • Booster is 3-3/4" thick from mounting surface to mounting surface for master cylinder
  • Shaft coming out of booster for attachment to pedal arm is 3/8" fine thread
  • Outside diameter is 7"

Speedway Motors 91031451 Specifications

KEY SPECS
MFG. Part #91031451
BrandSpeedway Motors
Brake Booster Diameter7 Inch
Master Cylinder MaterialSteel
Master Cylinder FinishChrome
GENERAL
Brake Booster TypeVacuum Diaphragm Single
Outlet CountTandem/Both Sides
Outlet Fitting3/8"-24
Master Cylinder Bore Size1 Inch
Brake Booster MaterialSteel
Brake Booster FinishChrome
Overall Length12"
Master Cylinder Port Sizes3/8"-24 IFF
Bolt Hole Pattern3.38" x 3.38"
Centerline of Holes3.38"
Reservoir IncludedYes
Sold in QuantityKit
NotesChrome finish on both master cylinder and booster.

Ratings & Reviews

4.9

8 Reviews

Overall Assessment

Customers commend our Chrome Brake Booster & Master Cylinder for its excellent fit, easy installation, and superior finish. They appreciate its practicality in various motor builds, including F100's, Chevy trucks, and street rods. Though some report a need for minor modifications, the product's aesthetic appeal impresses users. Most reviewers find its braking power satisfactory, positioning it as an efficient and functional option compared to rival offerings. It's deemed worth the investment for its observable quality and capabilities.

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4.9

8 reviews

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7

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i would buy this product again.

5.0

6 months ago

Bones

Sunnyvale CA

Verified

Simple installation, worked as promised.

Would Recommend

Chrome Brake Booster & Master Cylinder

5.0

4 years ago

Rob

GA

Had to modify the stock mounting bracket on my 78 F100 and by the brake rod kit but other than that the install, fit and finish went well.

Would Recommend

Chrome Brake Booster and Master cylinder kit

5.0

4 years ago

Paul (Big Lake Cruisers car club)

Clewiston, Florida

Verified

Received the items ordered, as expected. Easy installation and now, everyone comments on the appearance. Thanks again Speedway. Paul ; South Florida

Would Recommend

Better looking in person

5.0

6 years ago

Chadtherunner

Irvine, CA

Verified

This is going in my Factory Five MK III

Good product

5.0

7 years ago

None

Monee Illinois

Verified

Updating brakes on 1954 Chevy truck

Customer review image

Great product

5.0

10 years ago

Joe

Missouri

Verified

This product is exactly what I was looking for. Works great on my street rod build.

Would Recommend

Chrome booster/master cylinder

5.0

12 years ago

Jc55hevy

Wilton, ca. 95693

Verified

Very happy with this new chrome booster and master cylinder set up, thanks Speedway motors!

Would Recommend

Good looking power booster kit

4.0

12 years ago

Cligger

Omaha,ne

Verified

Looks good and installs easy, but having small problem getting a good brake stoping power. Won't lock up the brake if have to stop suddenly.

Would Recommend

Showing 8 of 8 reviews

Questions & Answers

10 Questions • 11 Answers

67 mustang, 6 cylinder, all drums. What booster will work for my application.

by Sam

• 8 years ago

1 answer

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Will this fit my '69 F100 with 73-79 front disc and OEM rear drums

by Josh

• 8 years ago

1 answer

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Will this master cylinder and booster fit my 77 bonneville

by Mike

• 9 years ago

2 answers

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building a 66 mustang, 302 smallblock, factory 3 speed with z bar, will this have the clearance that I need? will it work?

by jt

• 9 years ago

1 answer

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Does this fit the Universal pedal assembly part #9106004?

by Harold

• 10 years ago

1 answer

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part # 91031451 I want to put this on a 1975 mercury cougar. The old booster is 11.25" single diaphragm. Will this work on my car? Small block 351w

by

• 14 years ago

1 answer

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Will this work on a 1967 Camaro with 427 engine?

by

• 15 years ago

1 answer

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will this fit a 1964 nova

by

• 15 years ago

1 answer

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HOW DO I know which to order ? single or double diaphram booster?

by Fdbury

• 15 years ago

1 answer

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any one ever tried to install this in a model T? whats the best way for assisted brakes on a T thanks dave,

by T NUT

• 15 years ago

1 answer

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