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Power/Manual Master Cylinder, 1-1/8 Inch Bore

Specs
Centerline of Holes:
3.38
Material Type:
Steel
Overall Height:
5.00
Overall Width:
4.25
Sold in Quantity:
Each
Finish:
Natural
Mounted Length:
8.25
Bore Size:
1.13
Outlet Fitting:
3/8"-24 (4)
Garage Sale:
No
Notes
Pushrod hole allows use with manual pedals and/or power boosters.
Power/Manual Master Cylinder, 1-1/8 Inch Bore

Click image to enlarge

Details

Reviews

Q & A

What's in the Box

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

Brake System Builder's Tip (Link)

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

Notes


Customer Reviews

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

530cougardad
Verified Purchaser
Redding, Ca

just right

July 14, 2012
do your research and make sure you order the right bore size for your application. this had the right bore the right fit and the same sized ports on each side. perfect product for what I am sure are many applications
Pros:
  • Fits Well
  • Right size bore
  • Duel ports
Yes, I recommend this product.
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Was this review helpful? 0 0

stevesrodshop
Verified Purchaser
meeker,ok

Great Product

December 07, 2010
great universal street rod application
Pros:
  • Universal
Yes, I recommend this product.
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Was this review helpful? 0 0

Page 1 of 1

Product Q&A

9 questions : 9 answers

1 answers

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.

Grantp
Salt lake
June 14, 2014

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.

Answers

June 16, 2014
EricM
The 1 1/8” bore master should be more than enough for your 40’s drum brakes. If you are experiencing excessive pedal travel then could be some issues to address. First if the pedal isn’t hard then there is still air in the lines. If it was bench bled to verify no air in the piston cavities then air may still be in the lines. The pedal ratio needs to be 6.5 to 1 or higher with a 1 1/8" bore master. The large reservoir which is furthest from the mount flange is the reservoir going to the front brakes. Also the shoes must be adjusted to just touching the drum to have a high pedal.
1 answers

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?

harleyrules
Rockaway Township, NJ, USA
August 10, 2013

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?

Answers

August 13, 2013
Jason
On your 34 Ford with disc brakes front and rear a 1 1/8” bore master cylinder would be the choice as long as you have sufficient vacuum of 18-20 inches available at the booster. We also suggest a pedal ration of 6 to 1 or better. If you do not have enough vacuum the best alternative is to use a 1” bore master cylinder as less pedal pressure is required to achieve the same psi at the calipers than the 1 1/8” master.
1 answers

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!

TheAlbatrossHotRod
UK
June 18, 2013

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!

Answers

June 18, 2013
Jason
This 1-1/8" bore master cylinder has all four outler ports that are 3/8-24. Fitting part #6174129 is 3/8-24 but female and you will need a male fitting part #910318-3/8
1 answers

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 ???

quest1946
kenosha wi 534
May 17, 2013

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 ???

Answers

May 17, 2013
Jason
Master cylinder number 91031440 is 1 1/8” bore and can be used with a disc/drum application with a power booster. If you are running without a booster we suggest a 1” bore number 91031445 to help limit pedal pressure requirement. With disc front and drum rear you will need a proportioning valve and we suggest an adjustable under number 91031353 or a fixed number 91031364.
1 answers

which port goes the front brakes large or small

rayh
April 26, 2013

which port goes the front brakes large or small

Answers

April 26, 2013
Jason
The larger port always goes to the front brakes on this master cylinder
1 answers

Is this considered interchangeable with a GM Corvette style master cylinder which has ports only on the left side? My booster is for a GM-type master cylinder, but I need the ports on the right side. 2nd question, are the fittings 3/8-24 inverted flare or

bob
Huntsville, AL
August 10, 2012

Is this considered interchangeable with a GM Corvette style master cylinder which has ports only on the left side? My booster is for a GM-type master cylinder, but I need the ports on the right side. 2nd question, are the fittings 3/8-24 inverted flare or

Answers

August 13, 2012
John
This master cylinder is same configuration as the GM Corvette style and has 3/8 x 24 ports on both sides. Plugs included for the unused ports.
1 answers

Can I use a non-power master cyl. and add a power booster to it

Hope Maine
June 24, 2011

Can I use a non-power master cyl. and add a power booster to it

Answers

June 27, 2011
Jason
This master cylinder is set up to work with manual pedals and/or power boosters
1 answers

How do I know if I need the 1-1/8 bore or 1" bore master cylinder?

Harry
Santa Barbara, CA
May 31, 2011

How do I know if I need the 1-1/8 bore or 1" bore master cylinder?

Answers

June 01, 2011
Jason
This will depend on application. The smaller the bore this stiffer the pedal, bigger the bore the more fluid it moves. If using up to 11" rotors with 2 or 4 piston calipers. a 1" is probably the preferred choice. If using larger rotors and/or 4 to 6 piston calipers go with 1-1/8. Disc/drum or drum/drum the 1" is more common.
1 answers

which port goes the front brakes each ports are the same size.

bernie
SC
May 28, 2015

which port goes the front brakes each ports are the same size.

Answers

May 29, 2015
Eric
Expert
The port closest to the mount flange is for the front brakes and the port furthest from the mount flange is for the rear brakes.
Page 1 of 1

You may also be interested in:

Universal Power/Manual Master Cylinder, 1 Inch Bore, Corvette-Style
(Part #91031445)
                        

These high-tech corvette-style master cylinders were designed using OE specifications and 100% tested.  They have a 1" bore and are suited for disc/drum combinations. Each master cylinder is ported on both the left and right sides, allowing for installation in many different applications. This exclusive design features a mating flange that works with applications requiring 3-1/8” through 3-3/8” bolt patterns.  These master cylinders will work with manual or power brake systems and can be quickly changed with the included adapter pin to plug the deep well.  The wide body and low profile gives this master cylinder the clearance you need when installing in tight areas and yet it maintains a large volume of fluid necessary for 2 and 4 wheel disc brake applications.

  • 1" bore
  • 3/8"-24 IFF outlet ports on both sides
  • Plugs are included for the unused ports
  • Mount spacing is 3-3/8" on center
  • Works with power or manual brake systems
  • Compact, for installation under floor or on firewall
  • Suited for either disc/disc or disc/drum combinations 
  • Stroke of this master cylinder is approximatlely 1-1/16"

Brake System Builder's Tip (Link)

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

Single 7 Inch Brake Booster Master Cylinder Combo, 1-1/8 Inch Bore
(Part #91031410)
                        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

Dual 7 Inch Brake Booster Master Cylinder Combo, 1-1/8 Inch Bore
(Part #91031412)
                        

Compact 7" dual diaphragm booster assembly for installation under floor or on firewall of almost any vehicle. 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

Dual 8 Inch Brake Booster Master Cylinder Combo, 1-1/8 Inch Bore
(Part #91031414)
                        

Compact 8" dual diaphragm booster assembly for installation under floor or on firewall of almost any vehicle. 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

Wilwood 261-13270 Aluminum Tandem Master Cylinder Kit with Bracket and Valve
(Part #26113270)
                        

These Aluminum Tandem Chamber Master Cylinder kit from Wilwood comes with a Combination Proportioning Valve, mounting bracket, fluid tubes and mounting hardware. The Tandem Master Cylinder represents the latest in refinements in brake pressure actuation and fluid control. The slotted flange mounting makes it a simple bolt on for many OE mounts including the popular Chrysler, Corvette, GM, and Ford Mustang bolt patterns and is compatible with manual or power brake system applications. Master cylinders are available with a 1-1/8” bore size and they come in your choice of standard, ball burnished, or black E-coat finishes.

The combination proportioning valve substantially simplifies wiring and brake proportioning adjustments on vehicles with custom brake systems. The combination block maintains full isolation between front and rear fluid circuits and is specifically designed to accompany the Tandem Chamber Master Cylinder. The combo valve and bracket are black E-coated for a performance look and long lasting durability. Stainless steel fluid tubes are precision bent with preinstalled stainless tube nuts for a simple bolt-on installation between the Combination Proportioning Valve and the Wilwood Tandem Master Cylinder. Stainless steel button head fasteners thread into the bracket for a simple installation and years of durable, rust-free performance. Simply connect the fluid lines, bleed the system, and you're finished.

  • Bore size: 1-1/8"
  • 1.1" stroke
  • Dual tandem outlets - 1/2"-20
  • Fit size 1: 3/8"-24 IF or 1/2"-20 IF
  • Fit size 2: 3/8"-24 IF or 9/16"-18 IF
  • Integral res type
  • Aluminum
  • Choose from standard, ball burnished, or black E-coat finish

Wilwood Tandem Master Cylinder Kit Product Data Sheet (PDF)

New Product Release (PDF) 

OTB Gear 6437 Master Cylinder Conversion Top for Remote Brake Fluid Reservoir
(Part #9106437)
                        

This Master Cylinder conversion top is for your double chamber reservoir from OTB Gear. It is precision cast aircraft grade A-356 aluminum. Its retro-style design entails 1/8" NPT inlets.

  • Retro-style design
  • 1/8" NPT Inlets
  • Polished
  • Made in the USA 

Fits: Early Corvette style master cylinder.

OTB Gear 6438 Master Cylinder Conversion Top for Brake Fluid Reservoir
(Part #9106438)
                        

This Master Cylinder conversion top is for your double chamber reservoir from OTB Gear. It is precision cast aircraft grade A-356 aluminum. Its retro-style design entails 1/8" NPT inlets.

  • Retro-style design
  • 1/8" NPT Inlets
  • Unpolished
  • Made in the USA 

Fits: Early Corvette style master cylinder.

OTB Gear 6433 Remote Brake Fluid Reservoir, Polished
(Part #9106433)
                        

This double chamber reservoir from OTB Gear is precision cast aircraft grade A-356 aluminum. It allows you to run the fluid lines from the bottom or backside.

  • Retro-style design
  • 4-1/4" Wide X 3-1/4" High X 2-1/4" Deep
  • Inlets: 1/8" NPT
  • Made in the USA
Dual Outlet Master Cylinder Steel Dual Brake Line Kit
(Part #91031801)
                        

This is a pair of steel or stainless steel brake lines intended to simplify plumbing from the master cylinder to a proportioning block, such as our 910-31358 or 835-26011179.

  • Features tight 90° bends at the master cylinder end
  • Both ends of both lines are 3/8"-24 inverted flare nuts
  • The longer of the two lines measures app. 12" from the bend to the end
Replacement Pushrod for Manual Master Cylinder
(Part #91631946)
                        

This replacement pushrod for manual master cylinders fits our Dual Feed Master Cylinder 910-31420.

  • Overall Length:  6"
  • Threaded Length:  5-3/8"
  • Threads:  3/8" Fine

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

Dual Outlet Master Cylinder Stainless Steel Dual Brake Line Kit
(Part #91031802)
                        

This is a pair of steel or stainless steel brake lines intended to simplify plumbing from the master cylinder to a proportioning block, such as our 910-31358 or 835-26011179.

  • Features tight 90° bends at the master cylinder end
  • Both ends of both lines are 3/8"-24 inverted flare nuts
  • The longer of the two lines measures app. 12" from the bend to the end