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#91031435
Dual Diaphragm Power Brake Booster, 8 Inch, Chromate Finish
- Compact for installation under floor or on firewall of almost any vehicle
- NEW dual diaphragm booster measures 8" in diameter
- Booster mounts with four bolts on 3-3/8" centers
$160.99
/each
In Stock
Garage Sale alternatives: from $98.25
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Product Summary
Universal Fit, 5.25" Overall Thickness, 4" Rod Length
- Compact for installation under floor or on firewall of almost any vehicle
- NEW dual diaphragm booster measures 8" in diameter
- Booster mounts with four bolts on 3-3/8" centers
- Master cylinder studs measure 3-3/8" on center
- Booster measures 5-1/4" thick from mount surface to mount surface
Key Specs
| MFG. Part # | 91031435 |
| Brand | Speedway Motors |
| Outside Diameter | 8" |
| Material Type | Steel |
| Finish | Zinc |
Need To Know
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Speedway Motors 91031435 Details
Compact, 8" diameter for installation under floor or on firewall of almost any vehicle. Zinc chromate finish.
- 3-3/8" Bolt Pattern (Firewall Side)
- 3-3/8 Center to Center Bolt Hole (Master cylinder Side)
- Uses adjustable pin
- Great for installs on GM A, F, X, Body Cars with Big Blocks or Engines with tall headers
Learn more about the proper uses of residual valves by reading our tech article.Brake System Selection.
Charts
Booster Tech Tip (GIF)
Specs
- 8" O.D.
- 5-1/8" main body length
- 10-1/2" overall length
- Back of the booster to the end of the threaded plunger rod is 4-1/8"
- Firewall mounting studs are ¾" long at 3-3/8" center-to-center
- Front master cylinder studs are 1-1/8" long at 3-3/8" center to center
Guides & Documents
Speedway Motors 91031435 Specifications
Speedway Motors 91031435 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 91031435 |
| Brand | Speedway Motors |
| Outside Diameter | 8" |
| Material Type | Steel |
| Finish | Zinc |
| GENERAL | |
| Overall Thickness | 5.25" |
| Bolt Hole Pattern | 3.38" x 3.38" |
| Centerline of Holes | 3.38" |
| Rod Length | 4" |
| Brake Booster Type | Vacuum Diaphragm Dual |
| Sold in Quantity | Each |
| Notes | Dual diaphragm booster. |
Ratings & Reviews
4.8
26 Reviews
Customers have consistently praised the product for its reliable performance and perfect fit. It's confirmed to improve braking power remarkably, proving superior to smaller, 7" models. Although a few customers had compatibility issues, the majority affirmed its ease of installation even on vintage cars, appreciating its quality and practicality. Its perceived value-for-money affirms it as a recommended purchase over competitive offerings.
Ratings & Reviews
4.8
26 Reviews
Customers have consistently praised the product for its reliable performance and perfect fit. It's confirmed to improve braking power remarkably, proving superior to smaller, 7" models. Although a few customers had compatibility issues, the majority affirmed its ease of installation even on vintage cars, appreciating its quality and practicality. Its perceived value-for-money affirms it as a recommended purchase over competitive offerings.
4.8
26 reviews
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23
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Most Liked Positive Review
5.0
I have brakes now.
I needed a small dia. booster to clear my tall valve covers. I bought a 7" at a car show and it didn't work. I'm not sure if it was bad or just too small. I ordered this 8" and my brakes work like new.
Most Liked Negative Review
1.0
Did not work for me
After numerous discussions with the tech. team, sent back my 7" single booster for this one. I was told the 7" booster was too small for my car(1962 Starfire). Installed this one and did not help at all. I had to buy another setup elsewhere as nobody could help me. Sent booster back, but had to keep the master cylinder as I listened to tech team. My advice is do your research well before buying anything.
Filter by Ratings
Direct replacement is nonexistent but this saved the day
5.0
10 months ago
Mr.B
Mccook Ne
Verified
Universal part that fit perfect and works get. Great solution for older vehicles
Would Recommend
Brake booster worked great
5.0
a year ago
Jason
Forest Hill, Maryland
Verified
The product was easy to install and fit perfectly.
Would Recommend
Direct fit
5.0
a year ago
Vintage racer 77
Pringle, sd
Verified
Made a big difference in braking power
Would Recommend
Yes
5.0
2 years ago
Joe
Lexington SC
It fit like it should, and works good.
Would Recommend
This product made me realize my old uniit never worked right
5.0
4 years ago
Steiny
York, Pa
Verified
This unit fit in my '55 Chevy perfectly. No issues.
Would Recommend
Did the job
5.0
4 years ago
Don
Ri
Verified
Did the job
Would Recommend
id buy this product over and over again,,,,
5.0
5 years ago
Tom
wisconsin
Verified
great place to do business,knowlegable staff,friendly,aim to please
Would Recommend
Yes fit great
5.0
6 years ago
Tweetie
Warwick ri
Verified
Perfect fit
Just as described
5.0
6 years ago
Mac
Fayetteville NC
Verified
I converted my std brakes to power brakes and this booster gave the perfect space around the tall valve covers. Also provides great stopping.
Would Recommend
Good product
5.0
7 years ago
Joe
Wisconsin
Verified
Good product, made a huge difference .
Would Recommend
Showing 10 of 26 reviews
Questions & Answers
Questions & Answers
9 Questions • 9 Answers
I have a 7 inch booster on my s10 and can't really stop my truck. I even adjusted the pushrod to the correct length and nothing. Will an 8" booster be any better?
by Nick
• 7 years ago
1 answer
View Answer
I need to replace the booster on my 1960 Olds Dynamic. 371 ps/pb car with drums all around. What modifications are required to use this unit in my application.
by LeadFreddie
• 10 years ago
1 answer
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I am replacing the booster and master cylinder on a 65 corvette and wanted to know if this booster would work
by gabriel
• 10 years ago
1 answer
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Does this brake booster have a vacuum check valve built in? I have installed this unit and Not getting good brakes on my car. Has mid size chevy disc brake in front and 10" ford in the rear. I get hint of good brakes once in a while but peddle seems to firm up as it would if you ran out of vacuum
by Mike1524
• 12 years ago
1 answer
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will the 8 inch booster directly mount to my 1968 camaro with wilwood master cylinder
by shamu
• 12 years ago
1 answer
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short or long pocket Brake Cylinder.? : Let me know if your booster works with both short and long pocket Brake Cylinder.?
by denoisy
• 12 years ago
1 answer
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Hi can I use this brake booster too my master cylinder/pedal assembly for model T,A 1932 part nr 91631926 Best regards
by
• 14 years ago
1 answer
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How long is it from the face where it bolts to the MC to the opposite face excluding the studs? I have your 7" booster now and need to know how much longer an 8" dual will be so I'll know what mods to make. thanks
by 41 chevy
• 15 years ago
1 answer
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I have 1964 F-100 with 223 six...need to know if this booster will directly bolt on to firewall or if it need an adapter ?
by slojet
• 15 years ago
1 answer
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9 of 9 questions shown