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Mustang II Complete 11 Inch Brake Kit, Ford 5 x 4-1/2 Bolt Pattern

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Specs
Sold in Quantity:
Kit
Bolt Pattern:
5 on 4.5"
Finish:
Natural
Rotor Diameter:
11.00
Caliper Finish:
Natural
Rotor Construction:
Vented
Material Type:
Cast Iron
Caliper Pistons:
Single
Rotor Location:
Front
Rotor Shape:
Round
Thread Pitch:
1/2"-20
Hardware Included:
Yes
Drilled:
No
Slotted:
No
Centerline of Holes:
5.50
Stud Length:
1.29
Stud Diameter:
.50
Rotor Thickness:
.88
Notes
Includes rotors, bearings and seals, calipers, pads, brake hoses, brake tabs, and caliper brackets.
Mustang II Complete 11 Inch Brake Kit, Ford 5 x 4-1/2 Bolt Pattern
Mustang II Complete 11 Inch Brake Kit, Ford 5 x 4-1/2 Bolt Pattern
Mustang II Complete 11 Inch Brake Kit, Ford 5 x 4-1/2 Bolt Pattern
VIDEO
Mustang II Complete 11 Inch Brake Kit, Ford 5 x 4-1/2 Bolt Pattern

Click image to enlarge

Please note the following about this product:

  • This item is sold as a kit.

Details

Reviews (17)

Q & A (13)

What's in the Box

Info

Upgrade your Mustang II based suspension from the stock 9-1/4" rotors to our 11" rotors with powerful single piston GM metric floating calipers. This simple bolt-on conversion requires no machining. For use on 1974-80 Pinto, Bobcat and Mustang II spindles.

Features a 5 on 4-1/2" Ford/Mopar wheel bolt pattern (increases track width 1/2" per side). Includes two 16" front brake hoses and 7/16"-20 banjo bolts with crush washers.

Note:  14" wheels will require clearance to be checked as not all 14" wheels will clear caliper

910-31944 Instructions (PDF)

Customer Reviews

Rated 4.8 out of 5 by 17 reviewers.
RATING BREAKDOWN
17 reviews
5 Stars
13
4 Stars
4
3 Stars
0
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

Eric the "Wildman"
Verified Purchaser
Verified Reviewer
Cleveland. Ohio

Great resto-mod... 1977 Pinto Station Wagon w/ V8 engine

May 21, 2016
Installation is relatively simple, I used this kit with standard brakes. I am sure the kit would be great with power brakes, bigger rotors bring the speed down quick, much safer than with 9 inch stock factory brake rotors. Mine stops almost as fast as if brakes had power assist... I would recommend this kit to anyone that has a Ford Pinto, Mercury Bobcat, Mustang II, whether you have swapped a V8 into one of them or a stock V8, this brake kit is the one to have! Should also consider changing wheels and tires. Stock 13 inch wheels will not work with this kit. Happy motoring!
Pros:
  • Much Faster Stopping
  • Reasonably Priced
  • Easy Install
  • Kit Is Complete
  • Gm Calipers Easy 2 Get
Cons:
  • Can't Think Of Cons
Yes, I recommend this product.
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Ron
Verified Purchaser
Verified Reviewer
Marietta, GA

Great Product!

May 01, 2016
Very fast shipment. Included all parts needed. Exactly as described in catalog.
Pros:
  • Comprehensive Instruction
  • Complete Kit
  • Easy Installation
Cons:
  • None
Yes, I recommend this product.
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John
Verified Purchaser
Roeland Park, Kansas

Quality product at a fair price!

April 17, 2016
I have a 1930 Modal A Ford Hot Rod with a Mustang II front end that had serious braking problems with the original 9" rotors. With this kit that problem no longer exists! My car smoothly and quickly comes to a safe stop in a much shorter distance.
Yes, I recommend this product.
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LONE WOLF
Verified Purchaser
KC MO

KIT WAS EASY TO INSTALL AND EVERYTHING WAS THERE

March 31, 2016
SIMPLE GOOD INSTRUCTIONS
Pros:
  • Worked Well
Cons:
  • No Problems
Yes, I recommend this product.
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Smoke show
Verified Purchaser
Verified Reviewer
Weiser idaho

I have purchased this twice .a winner

January 28, 2016
All good I highly recommend.
Pros:
  • Very Good Kit Has Everyth
Yes, I recommend this product.
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Fred
Verified Purchaser
Georgia

Excellent conversion kit

December 20, 2015
The kit made the transition to front disc brakes very easy, especially for a novice.
Pros:
  • Complete Easy To Install
Cons:
  • Good Kit No Negativities
Yes, I recommend this product.
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Willys
Verified Purchaser
Quebec Canada

quality parts that work well

November 17, 2015
fit well and function perfectly
Yes, I recommend this product.
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hairless
Verified Purchaser
sebastain fl.

used on 48 chevy pu

August 20, 2015
worked out great but should have got lighter spring rate.
No, I would not recommend this product.
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vonkysmeed
Huntington Beach, CA, USA

Works Great

January 03, 2014
Bought this to upgrade the brakes on my V8 pinto so that it would stop. Did a great job on collecting all required parts into one package. Also provided a 5 lug swap in the process... Only down side was the assembly instructions for the metric calipers are not included for shim locations. Had to pull it apart a few times to get it right... Car now stops quickly and safely...
Pros:
  • larger brakes
Cons:
  • no 4 lug option
Yes, I recommend this product.
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vonkysmeed
Huntington Beach, CA, USA

Works Great

January 03, 2014
Bought this to upgrade the brakes on my V8 pinto so that it would stop. Did a great job on collecting all required parts into one package. Also provided a 5 lug swap in the process... Only down side was the assembly instructions for the metric calipers are not included for shim locations. Had to pull it apart a few times to get it right... Car now stops quickly and safely...
Pros:
  • larger brakes
Cons:
  • no 4 lug option
Yes, I recommend this product.
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Page 1 of 2

Product Q&A

13 questions : 14 answers

1 answers

will these brakes work with mustang 2 two inch drop spindels

jkgm
cols. ohio
February 28, 2015

will these brakes work with mustang 2 two inch drop spindels

Answers

March 02, 2015
EricM
Yes this will work with 2" drop Mustang II spindles such as our part number 91034304.
2 answers

spindles Ok I have a 1962 falcon putting a 302 in it for know until I get my 351 Cleveland together. Putting factory 1974 mustang 2 suspension in it. Wanting to know what all I need to change. Springs and hubs ? Didn't know if spindles would be strong enough to support everything since they were 4 cyl spindles. I know you said the kit would fit the spindles. Not sure what to do.

GeorgeD
May 27, 2014

spindles Ok I have a 1962 falcon putting a 302 in it for know until I get my 351 Cleveland together. Putting factory 1974 mustang 2 suspension in it. Wanting to know what all I need to change. Springs and hubs ? Didn't know if spindles would be strong enough to support everything since they were 4 cyl spindles. I know you said the kit would fit the spindles. Not sure what to do.

Answers

July 02, 2015
Eric
Expert
The Mustang II spinldes are very, very strong. Don't worry about what engine came stock in that vehicle, the suspension will be up to the minor task you have at hand. Springs will obviously need to be a little stiffer with your setup but the suspension parts are more than strong enough to support your vehicle and engine combination.
May 28, 2014
EricM
The Mustang II spinldes are very, very strong. Don't worry about what engine came stock in that vehicle, the suspension will be up to the minor task you have at hand. Springs will obviously need to be a little stiffer with your setup but the suspension parts are more than strong enough to support your vehicle and engine combination.
1 answers

will this fit directly on my factory 4 cyl spindles

GeorgeD
May 25, 2014

will this fit directly on my factory 4 cyl spindles

Answers

May 27, 2014
EricM
Yes this will fit you 1974 Mustang spindles.
1 answers

Jason's answer that this MII 11" brake kit will work on "limited" 14 inch wheels. Is Jason talking about a minimum backset for 14" whls? Want to replace OEM 9" rotors with 11" rotors to improve no-vac assist braking/stopping. What is the limiting factor Jason mentioned? Backset??

Gene329
Forest Lake, MN
March 30, 2014

Jason's answer that this MII 11" brake kit will work on "limited" 14 inch wheels. Is Jason talking about a minimum backset for 14" whls? Want to replace OEM 9" rotors with 11" rotors to improve no-vac assist braking/stopping. What is the limiting factor Jason mentioned? Backset??

Answers

April 01, 2014
EricM
With an 11” rotor you had 1 3/8” all the way around for the caliper for a total of 13 ¾” you need for clearance inside your wheel. When disc brakes originated the disc brake wheels were of different design and flatter in the area of drop for tire removal. Offset of the wheel itself also can play an important part. If you look at a wheel from the mid 60’s it has a big drop inward from the bead for tire removal and along with the offset can easily run right into the caliper. Disc brake wheels and most aftermarket from the late 60’s on have a chance to clear the dimension above.
1 answers

Will this work on 69 disk brake spindles

86chevyss
January 15, 2014

Will this work on 69 disk brake spindles

Answers

January 16, 2014
EricM
No this fits '74 to '78 Mustang and '74 to '80 Pinto/Bobcat only. Sorry I do not have a disc brake kit for your '69 Mustang originally equipped with disc brakes.
1 answers

I have your Mustang ll drop spindles and 14" rims. Will this kit fit Chevy blot pattern

Ohiocharlie
Ohio
March 30, 2013

I have your Mustang ll drop spindles and 14" rims. Will this kit fit Chevy blot pattern

Answers

April 01, 2013
Jason
The 11” Mustang II brake kit uses GM calipers and nets an O.D. for comparison to the I.D. of your wheels of approximately 13.6”. This is to allow for caliper clearance and will work on limited disc brake 14” wheels.
1 answers

Mustang II IFS system. Does this kit require the use of "SHIMS" tack welded to the stationary pad when combining a Ford rotor and GM calipers? Currently I have 11" Granada rotors, Ford 5X41/2 pattern with GM calipers and weak front brakes. (wheels won't lock in panic braking). Will this kit improve my stopping power?

Willslimo
Florida
March 03, 2013

Mustang II IFS system. Does this kit require the use of "SHIMS" tack welded to the stationary pad when combining a Ford rotor and GM calipers? Currently I have 11" Granada rotors, Ford 5X41/2 pattern with GM calipers and weak front brakes. (wheels won't lock in panic braking). Will this kit improve my stopping power?

Answers

March 04, 2013
Jason
This brake kit number 91031944 uses Granada 11” rotors and GM calipers so it may not be an improvement to your existing brakes. This diameter rotor and caliper style stop GM cars weighing in over 4000 pounds and if you are under that weight we would suggest checking the rest of the brake system for other issues. Use of 3/16” line is recommended to aid in brake pressure and you will need 1200 to 1300 psi at the calipers to allow proper braking. Master cylinder bore size, pedal ratio, bleeding of the system, and other areas of concern need to be addressed. If looking for a higher power brake system we do offer the SSBS brake kit number 28614836 which may be of interest and also a Wilwood kit with multiple piston calipers. Brake pressure requirement will still be the same.
1 answers

Does this kit include bearings?

davewat
February 12, 2013

Does this kit include bearings?

Answers

February 13, 2013
Jason
Yes, this mustang II 11" brake kit part #91031944 does include bearings and seals, brake hoses, dust cap, slide bolts, spindle nuts, rotors, brackets, calipers and pads
1 answers

I have these on the front of a 40 ford pu what disc should I used for the rear?

January 13, 2011

I have these on the front of a 40 ford pu what disc should I used for the rear?

Answers

January 19, 2011
Waymon
If your rear axle is a stock 40 ford, we don't sell a brake kit for it. However If you have a later model axle with a 4-3/4, 4-1/2 or 5x5 bolt pattern, you can use our weld on kit 91031934.
1 answers

If I convert to the Item #91031944 with the 11" rotors and GM Metric floating calipers, will my mini-stock racing rims still fit? They are a 13" X 8" rim with a 2" backspacing.

JoeJoe
July 12, 2011

If I convert to the Item #91031944 with the 11" rotors and GM Metric floating calipers, will my mini-stock racing rims still fit? They are a 13" X 8" rim with a 2" backspacing.

Answers

July 13, 2011
Jason
No, with 11" rotor you will need 14" wheels minimum. Wheels will hit on calipers
Page 1 of 2

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