Single 7 Inch Brake Booster Master Cylinder Combo, 1-1/8 Inch Bore
Single 7 Inch Brake Booster Master Cylinder Combo, 1-1/8 Inch Bore
Speedway Motors

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#91031410

Single 7 Inch Brake Booster Master Cylinder Combo, 1-1/8 Inch Bore

  • Compact for installation under floor or on firewall of almost any vehicle
  • NEW booster measures 7" in diameter
  • Master cylinder has a 1 1/8" bore with 3/8"-24 IFF outlets on both sides of the master cylinder
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Master Cylinder Bore Diameter:

1-1/8 Inch

1 Inch

$246.99

/kit

In Stock

$251.98

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Product Summary

Universal Fit, 7 Inch Brake Booster Diameter

  • Compact for installation under floor or on firewall of almost any vehicle
  • NEW booster measures 7" in diameter
  • Master cylinder has a 1 1/8" bore with 3/8"-24 IFF outlets on both sides of the master cylinder
  • Four bolts on 3 3/8" centers
  • Master cylinder combo is 11.875" from end of the master cylinder to the firewall

Comes as a Kit

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Key Specs

MFG. Part #91031410
BrandSpeedway Motors
Brake Booster Diameter7 Inch
Master Cylinder MaterialSteel
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Speedway Motors 91031410 Details

Compact for installation under floor or on firewall of almost any vehicle. Booster measures only 7" in diameter. Cast iron master cylinder has a 1-1/8" bore and is suited for disc-disc or disc-drum combinations.

Master cylinder features two 3/8"-24 inverted flare ports on each side (plugs are included for ports not in use). 

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

Specs

  • Pushrod-to-mounting flange is 5-1/2"
  • Four bolts on 3-3/8" centers
  • Booster is 3.75" thick
  • Master cylinder combo is 11.875" from end of the master cylinder to the firewall
  • (4) qty 3/8"-24 outlet ports (2 plugs included)
  • 8" from mount to outer edge

Speedway Motors 91031410 Specifications

KEY SPECS
MFG. Part #91031410
BrandSpeedway Motors
Brake Booster Diameter7 Inch
Master Cylinder MaterialSteel
GENERAL
Brake Booster TypeVacuum Diaphragm Single
Outlet CountTandem/Both Sides
Outlet Fitting3/8"-24
Master Cylinder Bore Size1-1/8 Inch
Brake Booster MaterialSteel
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
Notes9103190 STEEL PORT PLUG KIT.

Ratings & Reviews

4.9

27 Reviews

Overall Assessment

Customers have consistently expressed satisfaction with the product's excellent quality, performance, and value for money. Many highlighted its perfect fit in small spaces, applauding its versatility and application in a variety of projects. The product's robust construction was also praised, indicating high material quality. The presence of comprehensive instructions was recognized as a valuable feature. A few customers mentioned the product's weight, but said it did not affect usability. Multiple customers have liked the purchase to the degree that they have bought it multiple times, indicating a high level of satisfaction and trust in the product's consistent performance.

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4.9

27 reviews

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5.0

10 months ago

Powerboostet

Fairfield

Verified

I installed it in 1984 Chevy shorty

Would Recommend

Great Booster / Master cylinder combo package

5.0

a year ago

Paul

Winter Garden, FL.

Verified

Have a 1939 Chevy Master Deluxe Business Coupe I purcahsed about 6 months ago and the master cylinder was leaking. This was the perfect combo package to replace the Booster and Master cylinder at the same time. I did the 1 1/8 inch bore because I will be upgrading the front calipers to 2.75" big bore metric calipers, also from Speedway.

Would Recommend

Customer review image

Haven't installed yet but hopefully soon.

5.0

a year ago

Country Boy

CT

Verified

I can't comment on this yet as I haven't installed it but it looks really nice.

I would and will use this set-up again

5.0

2 years ago

Butch

Farmington Michigan

Verified

This product was used on a 1969 Ford Falcon with 4 wheel drum brakes. Space is limited due to suspension tower. I had tried another booster-master cylinder set up that required a adapter bracket that raised the master cylinder above the suspension tower. The master cylinder was very close to the top of the tower . It looked wrong for the car and I didn't like it. The 7 inch booster combo put the master cylinder back down near the stock location. I was able to use the stock proportion valve in it's original location with fabricated lines. The dual ports on the master cylinder allowed me to install hydraulic brake light switch with adapter independent of the brake lines as the stock switch would not work properly on booster rod at the brake pedal

Would Recommend

When I built my next street rod, I will incorporate this int

5.0

2 years ago

Jb

Baker city oregon

Verified

The product is small enough. It fits very well in two applications like frames in on firewalls

Would Recommend

I would recommend this unit to anyone needing it.

5.0

2 years ago

Jaybird

Lawrence, KS

Verified

Bolted right on, no problem.

Would Recommend

Worked perfect for the small space I had to mount it.

5.0

3 years ago

Bill

Tn

Verified

No problems what so ever.

I would buy this product again

5.0

4 years ago

Larry Painter

Conway SC

Verified

Worked great

Would Recommend

Great product!

5.0

4 years ago

Reb Burgert

Georgetown, Texas

Verified

Fits perfect on my street rod!

Would Recommend

great product

5.0

6 years ago

Earls Do all Garage

Richmond Hill GA

Verified

Great product

Would Recommend

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Questions & Answers

14 Questions • 10 Answers

Does this master part # 91031410 have a built-in residual valve? It's important as if it does and you add one it can lock up the brakes. Thank you for you for any advice.

by Neil

• a year ago

1 answer

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Would I be better using your 1 inch or 1 1/8 inch bore master cylinder booster kit on my t bucket I have fitted your mustang 2 disc brakes front & rear thanks

by Glenn

• 4 years ago

1 answer

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Will this product work on a 1953 Chevy Bel air? Is there a kit that has the proportioning valve ,dual master cylinder,7 inch booster?

by Rich

• 10 years ago

1 answer

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Will this work on a 1952 Ford F1? Do you sell a kit for direct bolt in for frame mount master/booster and disc/drum set up?

by Stinky

• 10 years ago

1 answer

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is the push rod 3/8 or 5/16 and what threads?

by brett

• 11 years ago

1 answer

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will this fit a 57 buick roadmaster? what would i need to do to make it work or would another brake booster master cylinder combo work better?

by jack

• 11 years ago

1 answer

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Will this product fit a Ford F1 1950 drum & disc combination

by wilki

• 14 years ago

1 answer

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Will this brake booster and master cylinder combo fit on a stock 1952 chevy as a bolt on/replacement for the stock unit? Using discs in front and drums in the rear, would it provide good stopping power with considerable improvement over the stock system?

by GE

• 15 years ago

1 answer

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will this part # 910-31410 fit a 1977 Camaro?

by

• 15 years ago

1 answer

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Will this part #910-31410 fit a 1977 Camaro?

by

• 15 years ago

1 answer

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