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#91031440
Power/Manual Master Cylinder, 1-1/8 Inch Bore
- Corvette-style master cylinder has a 1-1/8" bore and can be used for multiple vehicles with either manual or power brakes
- Large bore master cylinders offer less pressure but more volume, meaning if you have large bore calipers, the brake pedal doesn't have to travel as far to create the needed volume
$94.99
/each
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Product Summary
Universal Fit, Firewall Position, Tandem Outlet Count
- Corvette-style master cylinder has a 1-1/8" bore and can be used for multiple vehicles with either manual or power brakes
- Large bore master cylinders offer less pressure but more volume, meaning if you have large bore calipers, the brake pedal doesn't have to travel as far to create the needed volume
- Features two 3/8"-24 IFF ports on each side allowing multiple mounting options, plugs included for the side not used
- 2 bolt mount spacing is 3-3/8" on center and can be modified if needed to adapt to your vehicle
- Piston has a deep well for manual brakes/push rod, plunger slug is included to work with a power booster, threaded adjustment of booster rod will need to be made when used
Key Specs
| MFG. Part # | 91031440 |
| Brand | Speedway Motors |
| Master Cylinder Bore Size | 1-1/8 Inch |
| Master Cylinder Material | Cast Iron |
| Finish | Natural |
Need To Know
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Return PolicySpeedway Motors 91031440 Details
Speedway Motors 91031440 Details
Corvette-style master cylinder has a 1-1/8" bore and is suited for disc/drum combinations. Features dual outlets so the plumbing can come out either side of the master cylinder. These master cylinders will work with manual or power brake systems. They come with a deep-well piston for manual brakes and an adapter to fill the deep well for use with a power booster.
- 3/8"-24 IFF outlet ports
- Plugs are included for the unused ports
- Mount spacing is 3-3/8" on center
- Works with power or manual brake systems
Note: Customers intending to use this as a manual brake pedal assembly should note that the pushrod and boot are not included.
Learn more about selecting the proper master cylinder for your vehicle by reading our tech article.Brake System Selection.
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Speedway Motors 91031440 Specifications
Speedway Motors 91031440 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 91031440 |
| Brand | Speedway Motors |
| Master Cylinder Bore Size | 1-1/8 Inch |
| Master Cylinder Material | Cast Iron |
| Finish | Natural |
| GENERAL | |
| Position | Firewall |
| Brake System Type | Disc/Drum |
| Outlet Count | Tandem |
| Reservoir Type | Integral |
| Pushrods Included | No |
| Outlet Fitting | 3/8"-24 IFF |
| Overall Width | 4.25" |
| Overall Height | 5" |
| Mounted Length | 8.25" |
| Centerline of Holes | 3.38" |
| Sold in Quantity | Each |
| Notes | Pushrod hole allows use with manual pedals and/or power boosters.9103190 STEEL port plug kit. |
| Pushrod Included | No |
Ratings & Reviews
4.8
31 Reviews
Customers appreciate the product for its confirmed quality, practicality, usability, and material quality - they note it as a perfect fit for multiple vehicle designs from '62 LeSabre's to '34 Fords. Its high adaptability for different brake systems (drum or disc) and ease of installation earn it high marks. Users echo its effectiveness in resolving brake issues, with no leakage reported. However, mention is made to ensure the correct bore size and fitting is ordered to ensure perfect functionality. The 4-port design is hailed as a standout feature that makes for an easier setup, affirming this product as a top choice among professionals. The product's consistent performance across various builds has repeatedly earned customers' trust compared to competitor products.
Ratings & Reviews
4.8
31 Reviews
Customers appreciate the product for its confirmed quality, practicality, usability, and material quality - they note it as a perfect fit for multiple vehicle designs from '62 LeSabre's to '34 Fords. Its high adaptability for different brake systems (drum or disc) and ease of installation earn it high marks. Users echo its effectiveness in resolving brake issues, with no leakage reported. However, mention is made to ensure the correct bore size and fitting is ordered to ensure perfect functionality. The 4-port design is hailed as a standout feature that makes for an easier setup, affirming this product as a top choice among professionals. The product's consistent performance across various builds has repeatedly earned customers' trust compared to competitor products.
4.8
31 reviews
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Most Liked Positive Review
5.0
Vet-Style Master Cylinder On 32 Ford
Used this M.C. To complete conversion front shoes to disc brake system. The four ports allowed easy, clean, efficient setup for brake lines and pressure switch.
Most Liked Negative Review
3.0
Yes
Have not used it yet
Filter by Ratings
Very versatile
5.0
2 months ago
Jethro
Tacoma
Verified
Great master cylinder for disc/disc applications. Ports on either side and the ability to use it with or without power brakes makes this master cylinder very versatile.
Would Recommend
4 ports give great flexibility
4.0
a year ago
Lincoln
Tx
Verified
1st unit that was delivered leaked from the piston shaft. Speedway was quick to exchange the part and get me back into the shop with the replacement
Would Recommend
brakes
5.0
a year ago
sam
jim thorpe pa.
Verified
was a perfect fit, brakes are great again
Would Recommend
An exact replacement for the MC on my Spirit T bucket
5.0
a year ago
Mike
Waco, TX
Verified
This is a replacement for the MC on my Spirit Industries T bucket. I assume Speedway is where they got it. My guess the original was leaking from sitting and rusting. The only problem I had is with the absolutely useless bench bleeder included with the MC. Save yourself some grief if you don't already have one and go to NAPA and buy their bench bleeder kit.
Would Recommend
Yes
3.0
a year ago
Boda
Illinois
Verified
Have not used it yet
Would Recommend
Worked Great!! Will definitely buy agsin
5.0
a year ago
1954 Chris
Texas
Verified
Master cylinder arrived on time and was just what I needed to get my power brake conversion working great!
Would Recommend
VERY GOOD PART
5.0
a year ago
37FORDGUY
PARKER,CO
Verified
USED ON MY 37 FORD WORKED WELL AND EASY TO BLEED
Would Recommend
I would definitely get this part again
5.0
a year ago
Bart
Old forge
Verified
Used it on ac Shelby replica works great no cons
Would Recommend
Master Cylinder
5.0
2 years ago
PKL
Panhandle Texas
Verified
I Installed the master cylinder in a 1923 Model T. It's installed under the floor. Worked good
This did the trick
5.0
2 years ago
Ratznest
Central Florida
Verified
This 1 1/8" bore mc was just the ticket to fix my grabby brakes
Would Recommend
Showing 10 of 31 reviews
Questions & Answers
Questions & Answers
14 Questions • 11 Answers
I'm wondering if this master cylinder will help? I have a 1929 Ford AA with your front disc kit 91339024 and for the rear, I'm using a 1986 Ford Sterling 1 ton rear with drum brakes. The master cylinder I'm using is your 91631926 kit. The problem is that I have brakes, but not good enough to stop quick , would the bigger bore help and if so, will this bolt right up where the other one was? I don't have much room for a lot of pedal travel. Also I'm using the right residual valves and proportioning block. Thanks for the help!!
by Farmer
• 7 years ago
1 answer
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Is this MC for disc/disc or disc/drum? Does it have residual pressure valves built in, or will I need a separate RPV for rear drums? I may convert to rear discs in the near future. If it already has an RPV it will have to be removed for rear discs.
by TexasTool
• 7 years ago
2 answers
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How do I know what port (front or back) goes to front or back lines on this particular master cylinder. 91031440
by Seth
• 8 years ago
1 answer
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what is the return policy on this master cylinder if it is bad?
by robert
• 10 years ago
1 answer
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I want to purchase a larger master cylinder for my 1964 Chevy Impala it currently has the single reservoir. She has drum brakes. Will this model be compatible with it?
by Markos
• 10 years ago
1 answer
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Will this work for disc/disc?
by Trevor
• 10 years ago
1 answer
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Will this work with a drum/drum manual brake setup? I have a model A ford hot rod with '40s ford manual drum brakes. There is a later disc/drum style master on it now with the big/small reservoirs and it won't move enough fluid to engage the front brakes.
by Grantp
• 12 years ago
1 answer
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I am building a 1934 Ford Coupe with Disc brakes front and rear. I have a 7 inch booster, what bore master cylinder do I need?
by harleyrules
• 12 years ago
1 answer
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Brake Adaptors I have this master cylinder but I do not have the brake adaptor fittings. I purchased 617-4129 but they appear to be the wrong ones. Can you give me a part number for the correct ones. thank you!
by TheAlbatrossHotRod
• 13 years ago
1 answer
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proportioning valve i'm building a 1931 model a ford street rod with wildwood disc breaks in the front and stock updated rear breaks will i have to run a proportioning valve when useing this master cylinder ???
by quest1946
• 13 years ago
1 answer
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