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#91031412
Dual 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
$260.99
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Product Summary
Universal Fit, Vacuum Diaphragm Dual Brake Booster Type
- 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
- Booster bolt pattern is four bolts on 3 3/8" centers which fits a variety of brackets and pedal assemblies
- New parts make installation cleaner and easier
Comes as a Kit
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Key Specs
| MFG. Part # | 91031412 |
| Brand | Speedway Motors |
| Brake Booster Diameter | 7 Inch |
| Master Cylinder Material | Steel |
Need To Know
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Return PolicySpeedway Motors 91031412 Details
Speedway Motors 91031412 Details
Compact 7" dual diaphragm booster assembly for installation under floor or on firewall of almost any vehicle. Cast iron master cylinder has a 1-1/8" 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
- 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 91031412 Specifications
Speedway Motors 91031412 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 91031412 |
| Brand | Speedway Motors |
| Brake Booster Diameter | 7 Inch |
| Master Cylinder Material | Steel |
| GENERAL | |
| Brake Booster Type | Vacuum Diaphragm Dual |
| Outlet Count | Tandem/Both Sides |
| Outlet Fitting | 3/8"-24 |
| Master Cylinder Bore Size | 1-1/8 Inch |
| Brake Booster Material | Steel |
| Overall Length | 13.5" |
| Master Cylinder Port Sizes | 3/8"-24 IFF |
| Bolt Hole Pattern | 3.38" x 3.38" |
| Centerline of Holes | 3.38" |
| Reservoir Included | Yes |
| Sold in Quantity | Kit |
| Notes | 9103190 STEEL PORT PLUG KIT. |
Ratings & Reviews
4.9
18 Reviews
Our product consistently receives high praise for its quality, usability, and superior braking performance compared to competitors. According to customers, it has been successful in improving overall braking by 100%, further enhancing vehicle safety. Its adaptability is also noted, fitting well in various car models from a 1966 f100 to a 1930 model A. Many have found the installation process easy and appreciate the value for the price. They also commend the reduced pedal travel, stating it results in superb braking. The knowledgeability of our technicians has been highly noted, further supporting customers in their choice. It's the recommended solution for braking problems, reinforcing its superiority over competitors.
Ratings & Reviews
4.9
18 Reviews
Our product consistently receives high praise for its quality, usability, and superior braking performance compared to competitors. According to customers, it has been successful in improving overall braking by 100%, further enhancing vehicle safety. Its adaptability is also noted, fitting well in various car models from a 1966 f100 to a 1930 model A. Many have found the installation process easy and appreciate the value for the price. They also commend the reduced pedal travel, stating it results in superb braking. The knowledgeability of our technicians has been highly noted, further supporting customers in their choice. It's the recommended solution for braking problems, reinforcing its superiority over competitors.
4.9
18 reviews
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Filter by Ratings
I used the same exact same product
5.0
5 months ago
Don
Visalia California
Verified
I use this exact same product about 22 to 25 years ago I guess with time and age the master cylinder gave out and apparently I didn't know it because it's in my truck which is under the floor. I don't drive it as much as I should, but apparently the master cylinder was leaking and took out my booster so it's time to replace same product different date. Thank you again for your service.
Would Recommend
I am very happy with this product and the price and fast del
5.0
2 years ago
Happy camper 71
Houghton Michigan
Verified
The product works great with no problems at all.
Would Recommend
Great quality
5.0
3 years ago
Amber
Wisconsin
Verified
Great quality part. Unfortunately I had to send part back because speedway doesn't carry the push rod eyelet I need for my vehicle and I can not find one anywhere on line. Speedways return process is simple and my refund was quickly processed.
Would Recommend
Works great really made a difference !!!!!!!$1$
5.0
5 years ago
Fat Fendered Ford
Galveston Texas
Verified
Improved overall braking by 100%
Would Recommend
I would buy this product again, and recommend to a friend
5.0
5 years ago
Flatiron
Oklahoma
Verified
I adapted this booster to my 1966 f100, to clear the Mercury script valve covers on my ford FE engine
Would Recommend
Great product, I would purchase it again
5.0
5 years ago
Mike
South Hadley, MA
Verified
This just what I need for my rat rod that I'm building.
Would Recommend
I would recommend this product
4.0
5 years ago
Rodguy
Montana
Verified
Good price,good value,easy to install
Would Recommend
Ordering made EZ
5.0
6 years ago
GW
Tucson
Verified
Phone sales made easy. Very respectful and knowledgeable representatives.
Would Recommend
Great product
5.0
6 years ago
Gary
Tx
Verified
I used this master cylinder and brake booster on a 1930 model A. It worked great and fit under the floor of the car
Would Recommend
Excelent booster and master cylinder
5.0
7 years ago
Louie Louie
Madison, WI
Verified
selected larger bore size to reduce pedal travel, and utilized dual booster to offset any perceived additional pedal pressure. Provided excellent results, hard pedal, reduced pedal travel, superb braking. Adjustment of booster to cylinder push rod clearance of .020 to .023 is critical. Too little clearance and brakes will drag. Too much and pedal will be low. Some use clay, but I recommend a tool available specifically designed to measure this dimension.
Would Recommend
Showing 10 of 18 reviews
Questions & Answers
7 Questions • 7 Answers
Questions & Answers
7 Questions • 7 Answers
What pedal assembly is recommended with this kit for a 31 ford coup disc/disc
by Topwop
• 8 years ago
1 answer
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What is the overall length from firewall mount to the opposite end of the master cylinder?
by stew
• 9 years ago
1 answer
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Are the residual valves internal to the dual master or external?
by Drymouth
• 10 years ago
1 answer
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push rod to pedal length can you extend the push rod to pedal length?
by osfp40
• 12 years ago
1 answer
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1964 Thunderbird disc conversion Would this combo work for a 1964 thunderbird that I am doing a disc conversion on the front? Would I still need a proportioning valve?
by JeffGeorgia
• 12 years ago
1 answer
View Answer
Is this suited for a drum-drum system I am running the original, rebuilt brake system on my 1954 IHC R110 and want to uprgade it to a dual reservoir master cylinder with a booster. Is a 1" or 1 1/8" mastercylinder best suited for this? Dual 7 Inch Brake Booster Master Cylinder Combo, 1-1/8 Inch Bore
by duaneg1
• 12 years ago
1 answer
View Answer
1 in. bore or 1 and 1/8? Model A st. rod. Disc /drum brakes. 7 in. dual diaphram booster. Brake pedal ratio not quite what it should be. What bore master cyl. best for this vehical?
by steamer
• 13 years ago
1 answer
View Answer
7 of 7 questions shown