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Founder, 1929-2014
Speedy Bill
Since 1952
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Aluminum Master Cylinder w/ Stainless Bore

Specs
Centerline of Holes:
3.25
Material Type:
Aluminum
Overall Height:
4.75
Overall Width:
4.30
Sold in Quantity:
Each
Finish:
Natural
Mounted Length:
8.00
Bore Size:
1.00
Feed:
Dual
Outlet Fitting:
3/8"-24
Sleeve Material:
Stainless Steel
Garage Sale:
No
Notes
Has a deep well piston that can be used with a manual pedal. Includes an adapter to fill the deep well so it can be used with a booster.
Aluminum Master Cylinder w/ Stainless Bore
Aluminum Master Cylinder w/ Stainless Bore
Product Video
Aluminum Master Cylinder w/ Stainless Bore

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Watch the video below to learn more about the Speedway Motors Aluminum Master Cylinder.

Details

Reviews

Q & A

What's in the Box

Brake fluid can ruin your master cylinder in just a few years. Stop the problem by using a stainless steel sleeved master cylinder. Our sleeved GM-style aluminum master cylinder provides a weight savings and longer service life. It has 2 mounting holes on a 3-1/4" center for 3/8" or 10mm bolts.

  • 1" stainless steel sleeved bore
  • Unpolished aluminum
  • Height from center line to the top most point on the retaining bar is 3.5"
  • 3/8"-24 inverted flare ports on each side
  • Includes plugs for the side not used
  • Deep piston design for manual or power brakes 
  • Pushrod NOT included

Learn more about selecting the proper master cylinder for your vehicle by reading our tech article. Brake System Selection.

Customer Reviews

Rated 4.1 out of 5 by 8 reviewers.
RATING BREAKDOWN
8 reviews
5 Stars
4
4 Stars
3
3 Stars
0
2 Stars
0
1 Star
1
RECOMMEND THIS PRODUCT:

LemonsS10
Verified Purchaser
Alameda, CA
Product Rating

Workes great!

September 14, 2014
I'm using this on a disc brake upgrade/conversion for a Chevy S10. I'm using Camaro LS1 front brakes up front and Camaro rotors with Wilwwod 2" metric calipers in the rear. I'm also not running a booster so the bakes are manual. I runt he truck in endurance road-racing events. This master paired perfectly with the system and pedal effort is easy. This master is a great quality item.
Yes, I recommend this product.
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BrianH
Verified Purchaser
Overland Park, KS, USA
Product Rating

Nice !

August 27, 2014
Works great. Looks good. Lightweight. I am using this on a manual break application, four-wheel disc.
Yes, I recommend this product.
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Mercmanleadsledin
Paso Robles, CA 93446, USA
Product Rating

Bad master cylinder

August 05, 2014
Installed this master cylinder on a completely new system 4-wheel discs bench bleed the master as you should. Could not get the brakes to function properly after bleeding spongy breaks went to the floor. Worked on it for three days installing residual valves and swapping the reservoir's from front to back. Called speedway no help what so ever when asking questions about the functions of the master cylinder. If it had residual vales built in and what reservoir went to the front and which one went to the back they avoided giving me a direct answer i also referred to the Q&A questions and they were contradicting with he told me which is Telling me they don't even know anything about the product they stock. Long story but master cylinder is bad out of the box bought a good master cylinder from someone else works great. Really expected more from speedway.
No, I would not recommend this product.
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kenm
Verified Purchaser
south atlanta metro area
Product Rating

i'm not sure how to rate a master cyl

July 28, 2014
your master cyl. seems to be working good light weight operating well
Pros:
  • Light Weight
Yes, I recommend this product.
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mikie13
Atascadero, CA, USA
Product Rating

ALUMINUM WITH A STAINLESS BORE

September 30, 2013
THIS HAS TO BE ONE OF THE BEST MASTER CYLINDER DEALS , I HAVE THEM ON 2 CARS, ONE WITH POWER DISCS, AND THE OTHER WITH MANUAL DISCS, THEY PERFORM GREAT ON BOTH AND WITH A STAINLESS STEEL BORE SHOULD LAST FOR A VERY LONG TIME, GREAT PRODUCT , I WILL BE PUTTING THESE ON ALL MY FUTURE PROJECTS, M. KLEIN
Pros:
  • stainless bore
Cons:
  • None at all
Yes, I recommend this product.
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Don M.
Halifax, NS, Can.
Product Rating

Just What I was Hoping For !!

June 27, 2011
I replaced a 1 1/8" MC that was just too hard to push the pedal. This 1" MC worked out very well, looks cool and is very LIGHT.
Yes, I recommend this product.
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1939 chevy
Verified Purchaser
Girard,IL.
Product Rating

Nice product for the money.

May 08, 2012
It came with part, to convert from standard brakes to power brake booster.
Pros:
  • Aluminum looks real good
  • Stainless sleeve
Yes, I recommend this product.
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kenm
Verified Purchaser
south atlanta metro area
Product Rating

i'm not sure how to rate a master cyl

July 28, 2014
your master cyl. seems to be working good light weight operating well
Pros:
  • Light Weight
Yes, I recommend this product.
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Page 1 of 1
91031428

Product Q&A

15 questions : 17 answers

1 answers

Does this master cylinder have residual pressure valves in both output ports or will I need to put external valves inline for a typical early 70's GM Disc/Drum setup?

FriedWires
February 07, 2015

Does this master cylinder have residual pressure valves in both output ports or will I need to put external valves inline for a typical early 70's GM Disc/Drum setup?

Answers

February 09, 2015
EricM
No this master cylinder does not have residual valves built in. With your master cylinder being mounted up high in your Nova a residual valve will not be required at least in the front disc brakes. For the rear drums it would still be a good idea to run a 10 psi residual valve since there is some spring pressure forcing against the wheel cylinder of drum brakes. A 10 psi residual valve on drum brakes can help give you a quick hard pedal.
1 answers

Main bore boss diameter What is the diameter of the main bore boss at the back of the MC? I want to use this on a 1977 Camaro with power brakes but want to be sure it will fit into the recess in the booster, where the MC attaches.

Steve68
Stafford Springs, Stafford, CT, USA
August 21, 2014

Main bore boss diameter What is the diameter of the main bore boss at the back of the MC? I want to use this on a 1977 Camaro with power brakes but want to be sure it will fit into the recess in the booster, where the MC attaches.

Answers

August 22, 2014
EricM
The boss that is installed into the master cylinder is 1.465" OD.
2 answers

What size brake lines do you reconnmend? Hello Speedway, I bought this master cylinder, and i also bought Wilwood 1937-48 Ford Brake Kit - Heavy Duty, 11.00" Item #: 83514011013, And Wilwood Rear Disc Brake Kit with Emergency Brake Item #: 8351407140. What size stainless brake line do you reconnmend using with this combination? 3/16"? 1/4"?

Cooter
Loretto, PA 15940, USA
June 05, 2013

What size brake lines do you reconnmend? Hello Speedway, I bought this master cylinder, and i also bought Wilwood 1937-48 Ford Brake Kit - Heavy Duty, 11.00" Item #: 83514011013, And Wilwood Rear Disc Brake Kit with Emergency Brake Item #: 8351407140. What size stainless brake line do you reconnmend using with this combination? 3/16"? 1/4"?

Answers

October 01, 2013
mikie13
l ran all 3/16 on my nova and it worked fine
June 06, 2013
Jason
This aluminum master cylinder has 3/8"-24 inverted flare ports on each side. 3/8"-24 is designed to use with 3/16" line and is the size recommended for your application.
1 answers

You mention in the first question above that this was compatible with disc brakes. I ordered this based on that question and it is holding pressure on the rear discs so I assume it must have a built in residual pressure valve in the rear indicating this m

Stovebolter
September 18, 2012

You mention in the first question above that this was compatible with disc brakes. I ordered this based on that question and it is holding pressure on the rear discs so I assume it must have a built in residual pressure valve in the rear indicating this m

Answers

September 19, 2012
Zach
The answer is both! This master cylinder has the deep pocket for the brake push rod, and it also comes with a slug that you can install to convert it to a shallow pocket.
2 answers

does it have a deep pocket for the push rod or the shallow pocket

mike
arkansas
September 18, 2012

does it have a deep pocket for the push rod or the shallow pocket

Answers

October 01, 2013
mikie13
it has a deep pocket and an adapter to make it shallow
September 19, 2012
Zach
The answer is both! This master cylinder has the deep pocket for the brake push rod, and it also comes with a slug that you can install to convert it to a shallow pocket.
1 answers

would it be ok to run DOT5 silicone brake fluid in this master cylinder?

mikie
atascadero, ca
November 09, 2011

would it be ok to run DOT5 silicone brake fluid in this master cylinder?

Answers

November 11, 2011
John
Part number 91031428 Speedway offers choices of brake fluids which meet or exceed the qualities of the Silicon DOT 5 brake fluid. We recommend using regular brake fluid with a DOT rating of 3 or more in non silicon style.
1 answers

hello, if this master cylinder have the same capacity in each reservoir front and rear it is an obligation to use the rear reservoir for the front discs and the front reservoir for the rear drum or can I use in any way. Is it preferable to use the stoplig

Philou
FRANCE
October 25, 2011

hello, if this master cylinder have the same capacity in each reservoir front and rear it is an obligation to use the rear reservoir for the front discs and the front reservoir for the rear drum or can I use in any way. Is it preferable to use the stoplig

Answers

October 25, 2011
John
Part # 91031428 Even tho the lid indicates same size reservoirs front and rear the reservoir furthest from the mount flange is larger and needs to be plumbed to the front brakes. A visual once the lid is removed will help clarify. Either of the unused ports can be used for the stop light switch if so desired and DOT 3 or 4 can be used for fluid.
1 answers

I am using this on a Ford, they normally use a larger reservoir for front discs and the smaller for rear drum. Normally the larger reservoir is on the rear of the master cylinder which makes it easy to determine how to use. 91031428 reservoirs appear to b

FE Boy
Orangevale, Ca.
September 18, 2011

I am using this on a Ford, they normally use a larger reservoir for front discs and the smaller for rear drum. Normally the larger reservoir is on the rear of the master cylinder which makes it easy to determine how to use. 91031428 reservoirs appear to b

Answers

September 20, 2011
John
The larger reservoir always goes to the front brakes and this master cylinder DOES have two different size reservoirs. The lid appears they are the same but while looking down from the top you will note the casting is larger for the reservoir furthest from the mount flange. This master cylinder is opposite the Ford style master cylinder in configuration but the large reservoir still goes to the front brakes. No boot is offered or serviced for this master cylinder. It also works with manual and power brakes and for manual you will need to make sure the piston has a deep bore. It comes with a slug that is inserted into the piston for power brake applications if needed but can be discarded for manual brakes.
1 answers

Is this a direct bolt in for a '78 Corvette with power brakes?

July 15, 2011

Is this a direct bolt in for a '78 Corvette with power brakes?

Answers

July 18, 2011
John
This GM Corvette style master cylinder is a direct bolt on for many GM and hot rod applications. 3 ¼” center to center bolt pattern and designed for 3/8 pr 10mm bolt size. It works with manual or power brakes as the piston has the deep bore for the push rod on manual brakes and when used with a booster has the slug that is inserted into the piston to reduce it to a slight dish for the booster push rod spud.
1 answers

What is the big differance betweem 1 1/8 bore and the 1" bore

old skool
Mich
July 11, 2011

What is the big differance betweem 1 1/8 bore and the 1" bore

Answers

July 12, 2011
Jason
The smaller the bore the stiffer the pedal will be. The larger bore moves more fluid. Depending on size of calipers will affect what size of master cylinder is preferred. If using single piston calipers use a 1" master cylinder in most applications. Dual piston application use 1-1/8".
Page 1 of 2

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