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Bill Smith
Founder, 1929-2014
Speedy Bill
Since 1952
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America's Oldest Speed Shop ®

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

Specs
Centerline of Holes:
3.38
Material Type:
Steel
Overall Length:
12.00
Sold in Quantity:
Kit
Outside Diameter:
7.00
Bore Size:
1.13
Outlet Fitting:
3/8"-24 (4)
Bolt Hole Pattern:
3.38" x 3.38"
Garage Sale:
No
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
Single 7 Inch Brake Booster Master Cylinder Combo, 1-1/8 Inch Bore

Click image to enlarge

Please NOTE the following about this product:

  • This item is sold as a kit.

Details

Reviews

Q & A

What's in the Box

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

Customer Reviews

Rated 4.7 out of 5 by 3 reviewers.
RATING BREAKDOWN
3 reviews
5 Stars
2
4 Stars
1
3 Stars
0
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

Flash
Verified Purchaser
W.Palm Beach. Fl
Product Rating

Bolted right up and works great.

September 16, 2011
[...] I have been doing buss with speedway for over 20 years. Thanks Jack
Yes, I recommend this product.
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Was this review helpful? 0 0

Bob
Verified Purchaser
North Carolina
Product Rating

Very nice unit for my Hot-rod

August 26, 2012
Made a nice installation under the floor in my 36 Chevy P/U.
Pros:
  • Easy To Install
Yes, I recommend this product.
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Was this review helpful? 0 0

Craig
Grass Valley
Product Rating

Great value

January 20, 2010
Fits just like it is supposed to.
Pros:
  • Great product
Yes, I recommend this product.
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Was this review helpful? 0 0

Page 1 of 1

Product Q&A

8 questions : 8 answers

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

1 answers
wilki
Hull England
December 22, 2011

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

Answers

December 23, 2011
Zach
Speedway part number 91031409. This brake booster and master cylinder would work fine on a Disc/Drum application. I would recommend using the 1" bore master cylinder and make sure to use a proportioning valve like our 91031353 to adjust your brake bias.

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?

1 answers
GE
Gig Harbor, WA
August 06, 2011

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?

Answers

August 10, 2011
John
This booster/master cylinder is NOT a direct bolt on in place of an original non boosted brake system. The bolt pattern for the booster is 3 3/8” vertical and horizontal so fabrication or modification would be required. We offer a master cylinder conversion plate under part number 91031402 that may be of interest in the switch over. You will need to have 18-20 inches of vacuum available at the booster to achieve full power assist and advise a simple vacuum check before ordering. If insufficient vacuum is available we do offer our 12 volt pump under part number 91028146 to remedy the problem. With sufficient vacuum pedal pressure requirement to stop the car will be substantially lower provided the rest of the brake system is in good condition with properly bled components.

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

1 answers
July 11, 2011

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

Answers

July 14, 2011
John
These combination master cylinder and boosters fit many applications. The bolt pattern for the booster is 3 3/8” both horizontal and vertical center to center. Master cylinder available in 1” or 1 1/8” depending on application. You will also need a Clevis for the end of the threaded push rod for attachment to the pedal such as part number 91002973. Verify following dimensions for fit to your application: 7" Booster 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 Master Cylinder Specs: * (4) qty 3/8"-24 outlet ports (2 plugs included) * 8" from mount to outer edge

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

1 answers
North Platte, NE
July 08, 2011

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

Answers

July 12, 2011
John
This master cylinder/booster works on many applications including the late 60’s and up GM cars and trucks. The bolt pattern for the booster is 3 3/8” center to center vertical and horizontal both. The master cylinder is offered in 1” bore for disc/drum applications or 1 1/8” for four wheel disc brakes. You may also need a clevis to complete the hook up to your pedal such as part number 91002973.

1957 truck (3100) and I intend to order 91031916, 91031973, 91031409 or 10. Why do I care if the booster has a 1" or 1 1/8" bore? larry

1 answers
larry
round rock, tx
June 15, 2011

1957 truck (3100) and I intend to order 91031916, 91031973, 91031409 or 10. Why do I care if the booster has a 1" or 1 1/8" bore? larry

Answers

June 16, 2011
John
In ordering our master cylinder/booster kits you have the choice of 1” bore or 1 1/8” bore. One inch bore is recommended and applicable to a 4 wheel drum or a disc/drum application. 1-1/8” bore is generally used for a 4 wheel disc brake set up but is NOT mandatory. Going to a 1 1/8” bore master will cut down on pedal travel but also increase the amount of pedal pressure that will be required. Without the power assist the 1 1/8” bore master cylinder would require more pedal pressure on a normal set up than desired and customers may have a hard time stopping their vehicle. Main concern going to a power brake system is the available vacuum from the engine. The manufacturers require a minimum 18-20 inches of vacuum available at the booster to get the power assist desired. Hot rod engines with radical cams may experience a loss of vacuum and in this case the customer would need to either go with manual brakes or add an additional 12 volt vacuum pump in order to get the appropriate vacuum for power brakes.

Will this product fit on the inside frame of 57 chevy pickup

1 answers
57 chevy p.u.
Breda Ia.
April 02, 2011

Will this product fit on the inside frame of 57 chevy pickup

Answers

April 06, 2011
Craig
The booster master cylinder combo part # 91031409 would work with the brake pedal assembly part # 91031973 and fit under the floor of the 57 Chevy pickup.

does it fit a 1960 T'Bird?

1 answers
March 15, 2011

does it fit a 1960 T'Bird?

Answers

March 24, 2011
Waymon
We offer two versions of this master cylinder combos and they are the 7" Single Booster Combo, 1" Bore Item # 91031409, and the 7" Single Booster Combo - 1-1/8" Bore Item # 91031410. These are custom kits which are not tailored to any specific model/body style. Unfortunately we do not have a kit specifically for your T-bird but depending upon your fabrication/mechanical abilities you may make one of these kits work for your application. This unit measures aprox. 12 inches of length by 7 inches in width.

will this booster combo work with drum/drum system

1 answers
murfreesboro,tn
January 07, 2011

will this booster combo work with drum/drum system

Answers

January 11, 2011
Bill
The Brake booster/Master cylinder combo, part number: 91031409, will work with drum/drum brake. Use a I" bore for this application. You may also need additional items such as residual valves and adjust brake pedal ratio when switching from manual to power brakes.
Page 1 of 1

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