Dual 7 Inch Brake Booster Master Cylinder Combo, 1 Inch Bore
Dual 7 Inch Brake Booster Master Cylinder Combo, 1 Inch Bore
Speedway Motors

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#91031411

Dual 7 Inch Brake Booster Master Cylinder Combo, 1 Inch Bore

  • Compact 7" diameter booster allows for installation under the floor or on a firewall of almost any vehicle
  • Dual diaphragm booster design increases booster performance especially on lower vacuum engines
  • 1" bore dual outlet master cylinder effectively operates modern disc brake systems
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Master Cylinder Bore Diameter:

1 Inch

1-1/8 Inch

$205.99

/kit

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Product Summary

Universal Fit, Disc/Drum Brake System Type

  • Compact 7" diameter booster allows for installation under the floor or on a firewall of almost any vehicle
  • Dual diaphragm booster design increases booster performance especially on lower vacuum engines
  • 1" bore dual outlet master cylinder effectively operates modern disc brake systems
  • 3/8"-24 IFF outlets on the master cylinder allows common 3/16" brake lines to connect directly to it without the need for adapters
  • All new components for long life and hassle free braking

Comes as a Kit

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Key Specs

MFG. Part #91031411
BrandSpeedway Motors
Brake System TypeDisc/Drum
Brake Booster Diameter7 Inch
Master Cylinder MaterialSteel
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Speedway Motors 91031411 Details

Compact 7" dual diaphragm booster assembly for installation under floor or on firewall of almost any vehicle. Cast iron master cylinder has a 1" 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
  • 5" thick from master cylinder mount to firewall face
  • 4" long firewall mount face to end of pushrod
  • Pushrod stud is 3/8" fine thread
  • (4) qty 3/8"-24 outlet ports (2 plugs included)
  • 8" from mount to outer edge

Speedway Motors 91031411 Specifications

KEY SPECS
MFG. Part #91031411
BrandSpeedway Motors
Brake System TypeDisc/Drum
Brake Booster Diameter7 Inch
Master Cylinder MaterialSteel
GENERAL
Brake Booster TypeVacuum Diaphragm Dual
Outlet CountTandem/Both Sides
Outlet Fitting3/8"-24
Master Cylinder Bore Size1 Inch
Brake Booster MaterialSteel
Overall Length13.25"
Master Cylinder Port Sizes3/8"-24 IFF
Bolt Hole Pattern3.38" x 3.38"
Centerline of Holes3.38"
Reservoir IncludedYes
Sold in QuantityKit

Ratings & Reviews

4.7

31 Reviews

Overall Assessment

Customers have expressed satisfaction with the product's confirmed qualities and features. Many acknowledged its usability in a variety of applications, adapting well to different vehicle models and custom setups. Its compact size and fitting ability were frequently mentioned, proving its practicality. Users reported that it worked well under limited installation space. Many praised the product's dependability, indicating high material quality. Furthermore, the booster and master cylinder combo is confirmed to enhance power brakes to various vehicles optimally. Customers repeatedly stated they would buy the product again, underscoring its quality and consistent performance. Several pitted the product as superior to competitors, primarily due to its versatility, excellent fit, and straightforward installation.

Write A Review

4.7

31 reviews

5

25

4

5

3

0

2

0

1

1

Most Liked Positive Review

5.0

Just like the picture

I put it on my Chevy II with four wheel disc brakes. Fit great.

Most Liked Negative Review

1.0

No

While talking to the representatives on the phone they should have told me there was a mounting bracket that I would need in order to make the booster work

Filter by Ratings

No

1.0

2 months ago

Bart

New york

Verified

While talking to the representatives on the phone they should have told me there was a mounting bracket that I would need in order to make the booster work

Would Not Recommend

It's good brake system, works nice!

5.0

11 months ago

JMack

Dallas Tx

Verified

Power brakes are so nice! We needed to fabricate a mounting bracket for the firewall, but nothing difficult.

Would Recommend

Just What I Needed

5.0

a year ago

E.J.

Eau Claire WI

Verified

7" booster fit nicely under the floor. Came with the "spud" needed to connect the master cylinder to the booster.

Would Recommend

Yes

4.0

a year ago

Duane

St Paul

Verified

3/16th lines fit right in yes

Would Recommend

great unit and easy install

5.0

2 years ago

fry

Windsor ontario

Verified

changed out a single to a duel and it was plug and play

Would Recommend

Great quality

5.0

2 years ago

Babaloos pinstriping

San Bernardino ca

Great quality. Easy to install. Works great on my 54 Chevy.

Would Recommend

Yes I would buy again.

5.0

2 years ago

Jeepster

Cabot, Ar

Verified

Excellent value.

Would Recommend

i hope i don't need another

5.0

2 years ago

Steve

summerville,sc

Verified

have not used it yet

Would Recommend

Worked great

5.0

2 years ago

Bill

NC

Verified

Front disc brakes were dragging on a classic Chevrolet truck. Replaced with this power brake booster/master cylinder combo. Worked like it should! Problem solved.

Would Recommend

Yes

5.0

3 years ago

Flummoxed

Jackson Michigan

Verified

I don't know about other applications, but this was exactly what I needed.

Would Recommend

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Showing 10 of 31 reviews

Questions & Answers

20 Questions • 10 Answers

is it possible to get this Dual 7 Inch Brake Booster with a remote reservoir 1 inch bore Master Cylinder?

by Reinout

• 5 years ago

1 answer

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I have a 1956 f100 with 4 wheel disc. Will this work?

by Joey

• 7 years ago

1 answer

View Answer

I got the booster and master kit #91031411, I just got my pickup drivable today, when I step on the brakes, it's like there is no power assist, really have to step on pedal hard to stop, re bleed the brakes, checked my vacuum , engine is stock 350 chev, vacuum feels good, don't have a gauge, what would you suggest? I have a lot of mechanical experience, want to see what you think before I start taking things apart. thanks

by Rick

• 7 years ago

1 answer

View Answer

What port is for the rear? And for the front

by Ruddog

• 7 years ago

1 answer

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I have a 1948 1 1/2 ton dually and I would like to update the brakes. It currently uses an 11" single diaphragm booster. The axles/brakes are large (think Rockwell axles), but it came from the factory like this. Would a 7" dual diaphragm be sufficient, or would you suggest larger? I have plenty of room for mounting.

by Lipton

• 8 years ago

1 answer

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What size clevis is needed to connect to the pedal assembly

by Keith

• 8 years ago

1 answer

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Will this fit if installed in stock location on a 57 f-100 with hydrolic clutch?

by Flaco loco

• 9 years ago

1 answer

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Does this Master Cylinder use a Double Flare or Bubble Type Brake Lines ?

by Sam Stone

• 9 years ago

1 answer

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Where would I find the little pin that sits inside the master cylinder? The one that in the master cylinder between the brake booster and master cylinder. About 1.5" long and 0.5" diameter if I had to guess. I lost mine during unboxing.

by 29EssexRat

• 9 years ago

1 answer

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I ordered this for my 63 F100. The mounting bracket and rod end are not included. How do I get this mounted to my firewall?

by Joshua

• 9 years ago

1 answer

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