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Aluminum Master Cylinder w/ Stainless Bore

SAME DAY SHIPPING! Order within the next 10 hours 16 minutes and receive same day shipping

Specs
Material Type:
Aluminum
Sold in Quantity:
Each
Feed:
Dual
Finish:
Natural
Sleeve Material:
Stainless Steel
Outlet Fitting:
3/8"-24
Centerline of Holes:
3.25
Overall Height:
4.75
Overall Width:
4.30
Mounted Length:
8.00
Bore Size:
1.00
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
VIDEO
Aluminum Master Cylinder w/ Stainless Bore

Click image to enlarge

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

Details

Reviews (15)

Q & A (15)

What's in the Box

Info

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 4.2 out of 5 by 15 reviewers.
RATING BREAKDOWN
15 reviews
5 Stars
8
4 Stars
5
3 Stars
0
2 Stars
1
1 Star
1
RECOMMEND THIS PRODUCT:

Dennis
Verified Purchaser
Verified Reviewer
Fort Worth, Texas

This was a good buy.

March 01, 2016
Fitting sizes were different from what was on the master cylinder I removed. Caused some fabrication tasks that I had not planned on.
Pros:
  • Fit Well
  • Works Good
  • Looks Good
  • Saved A Little Weight
  • Good Buy
Cons:
  • Fitting Sizes Problematic
Yes, I recommend this product.
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1934
Verified Purchaser
DALLAS TEXAS

This thing work great and looks good

December 31, 2015
I WOULD BUY THIS PRODUCT AGAIN
Yes, I recommend this product.
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Paul
Verified Purchaser
Willis, TX

Definitely buy again!

December 20, 2015
Really like the aluminum light weight. You have to use care and not overtighten fittings.
Pros:
  • Good Value
  • Lightweight
  • Good Quality
Cons:
  • Don't Overtighten Fitting
Yes, I recommend this product.
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Backroad Bob
Verified Purchaser
Verified Reviewer
Woodland Hills, CA

Looks good & works good

September 14, 2015
Prompt delivery looks good , works good
Yes, I recommend this product.
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Rob
Verified Purchaser
Verified Reviewer
Sylvia,NC

I would buy this or any other product from Speedway again

August 08, 2015
Part installed with no problems
Pros:
  • Perfect Fitgood Finish
Cons:
  • None
Yes, I recommend this product.
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les
Verified Purchaser
DE

Had trouble with master cylinder, drifted down under hard pe

June 26, 2015
I am very pleased with the help you get from all the people i spoke with, Very Professional//
No, I would not recommend this product.
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Oldmusher
Verified Purchaser
Cambridge, MN

this master fixed my problem, can't improve on that.

June 17, 2015
Hope this "GM" part lasts longer than the cast iron piece it is replacing...that had less then 10,000 miles on it. Right after replacing it, my brake light switch (screws into master cylinder) blew out, which was one that Speedway sent as a recall replacement. Now have a new one from Speedway, hope it holds up.
Pros:
  • Great appearance
  • lighter weight
  • Fit Without Modifications
Cons:
  • Reverse Orientation
Yes, I recommend this product.
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LemonsS10
Verified Purchaser
Alameda, CA

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

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

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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Merchant Response:

Speedway Motors Customer Service team has issued this customer a return label for the defective unit received. We apologize for any inconvenience this may have caused and are happy to help in any way.
Page 1 of 2

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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