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Ford 9 Inch Bolt-On Rear Disc Brake Kit w/ E-Brake

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Specs
Material Type:
Cast Iron
Sold in Quantity:
Kit
Finish:
Natural
Bolt Pattern:
Dual: 5 on 4.5"/4.75"
Thread Pitch:
7/16"-20
Hardware Included:
Yes
Rotor Diameter:
11.25
Caliper Pistons:
Single
Rotor Thickness:
1.00
Minimum Recommended Wheel Diameter:
15 Inch
Caliper Finish:
Natural
Parking Brake Provision:
Yes
Rotor I.D.:
2.78
Rotor Backspace:
2.30
Rotor Construction:
Vented
Garage Sale:
No
Rotor Location:
Rear
Rotor Shape:
Round
Drilled:
No
Slotted:
No
Notes
Works with 8" Ford, small bearing 9" Ford, and new and old style big bearing ford 9" using 3/8" retaining bolts.
Ford 9 Inch Bolt-On Rear Disc Brake Kit w/ E-Brake

Click image to enlarge

Please NOTE the following about this product:

  • This item is sold as a kit.

Details

Reviews

Q & A

What's in the Box

If you don't want to spend an arm and a leg on a rear disc brake kit and still have to weld the bracket on, we've got you covered. This kit includes bolt-on caliper brackets, 11-1/4" vented rotors, '78-'88 GM emergency brake calipers, brake pads and hardware.

  • Fits both 5 on 4-1/2" and 5 on 4-3/4" bolt circles
  • For Ford passenger car axles ONLY 
  • Fits axle with maximum flange diameter of 6-1/4" O.D.
  • For 15" and larger wheel applications ONLY

NOTE: This bolt on brake kit is designed to be used on 8" and 9" housings using 3/8" retaining bolts. If you want to use it on a 9" housing with 1/2" bolts, you will need to use the 3/8" hardware to do so. Fits "old" and "new" style big bearing (3.150" bearing O.D.) Ford housings and with axle offsets of a minimum 2-3/8" to 2-1/2".

Axle Flange Identification Chart (GIF)

910-31921 Instructions (PDF)

Application

  • "Old-style" big bearing 9" Ford axle
  • "New-style" big bearing 9" Ford axle
  • 8" Ford axle
  • Axle housings with minimum axle offsets of 2-3/8" to 2-1/2"

This kit will NOT work on pickup housings or the 50's 9" housings as they only have about 2" backspace. The exception would be the late 50's station wagon rear ends.

When using with a Currie Axle with an o/d register of 2.795", the rotor is included in this kit with an i/d register of 2.78" and therefore will need to be machined by increasing the hole diamter in the rotor to match the Currie axle spec of 2.795"

Item Details

With emergency brake calipers.

Customer Reviews

Rated 3.9 out of 5 by 8 reviewers.
RATING BREAKDOWN
8 reviews
5 Stars
2
4 Stars
4
3 Stars
1
2 Stars
1
1 Star
0
RECOMMEND THIS PRODUCT:

jbcalhoun
Midland, TX, USA
Product Rating

Ford Disc Brake Kit

September 20, 2014
This kit was simple to install. Fit and Finish were second to none. I would recommend this kit to anyone wanting to upgrade their system.
Pros:
  • Great Fit
Cons:
  • None
Yes, I recommend this product.
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bigmurf
Detroit area
Product Rating

Great Kit; Lousy Instructions

May 09, 2014
This is a 5-star kit with 1-star instructions. My buddy and I got them together largely through a trial and error process, comparing the parts to the blurry illustrations. Without any identification of the parts in the illustrations, the written instructions are nearly useless. The instructions should advise that the stock retainer plates should definitely be removed. Otherwise, the T-bolts aren't long enough. Finding the right combination of spacers (provided with the kit) in order to center the calipers over the rotors is a tedious process. I ended up using all the spacers in the kit. I found it necessary to position the calipers facing straight back instead of up and back, as the latter position left the top caliper bolt inaccessible because of proximity to my '32 Ford's frame rail. With all of that said, it's a great kit in terms of the parts. Now I can't wait to try them out!
Pros:
  • Great parts
  • Great kit
Cons:
  • Lousy instructions
Yes, I recommend this product.
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Hammer'd Stude
Verified Purchaser
Avon, Indiana (westside of Indy)
Product Rating

Great Brake Kit.

January 14, 2012
Haven't gotten in snstalled yet, but looks like it will be great addition.
Yes, I recommend this product.
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Robert K
Verified Purchaser
Seattle, wa
Product Rating

Bolt on Rear Disc kit

November 18, 2011
The description should state for use with coilovers only. This kit will not work with buggy spring type suspension as the calipers will not "clock" to the correct position due to the spring perches mounted on housing and hole pattern of mounting plate
Yes, I recommend this product.
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Mert
Hurst, TX
Product Rating

Performance and Safety Upgrade for Brake

May 26, 2010
When I upgrade to a 9 inch rearend, or upgrade a lighter rear axle with big Ford Wheel Bearings, this item provides an option to 40 yr old drum brakes - AND provides the E-Brake necessary for state vehicle inspections, registration, etc.
Pros:
  • All new parts
  • Exceptional quality
  • Get Rid of Drums
  • Solves E-Brake Issue
  • Serious Street Capability
  • 100 percent complete
Yes, I recommend this product.
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chevy32
Verified Purchaser
Hutchinson, KS.
Product Rating

This product is great,I would buy again

March 16, 2012
This product is going on the rearend that I bought in my 1932 chevy coupe
Pros:
  • This product is perfect
  • It looks good
Yes, I recommend this product.
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RPM99
Verified Purchaser
Product Rating

Good overall brake kit

February 10, 2015
They installed ok better directions would be better and kit does not come with brake hoses.
Yes, I recommend this product.
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racer445
Verified Purchaser
Product Rating

Not a complete kit

March 31, 2015
I am missing the brake lines and e-brake cables to install this (kit) Don't even know what fits or how to make it work with my car.
Pros:
  • good price and parts
Cons:
  • not complete
No, I would not recommend this product.
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Page 1 of 1
91031921

Product Q&A

16 questions : 17 answers

1 answers

Will this fit 1971 Lincoln Continental Mark III 3.14 9", width 1.083h rear end

airborne98
El Paso, TX, USA
February 05, 2015

Will this fit 1971 Lincoln Continental Mark III 3.14 9", width 1.083h rear end

Answers

February 06, 2015
EricM
Yes this will fit your 1971 Lincoln with a 9" Ford rear end.
2 answers

Left or right I have this kit fitted to my street rod with the hand brake cables coming from the bottom . The bleed nipples at the bottom and the inlet at the top is this ok ??? Or have I got them the wrong way round

Mickster0721
Uk
November 30, 2014

Left or right I have this kit fitted to my street rod with the hand brake cables coming from the bottom . The bleed nipples at the bottom and the inlet at the top is this ok ??? Or have I got them the wrong way round

Answers

February 11, 2015
RPM99
Bleeders allways!! need to be on top
December 01, 2014
EricM
The inlet fitting needs to be on the bottom and the bleeder at the top. You have the calipers on the wrong side of the car. Take the calipers off and swap sides and they will be correct.
1 answers

Will this kit fit 15x10 deep dish Cragar Super Sport rims Hi, I purchased Wilwood brake kit 835-1407139 the rotors are 12.19". With calipers bolted on, my Cragars would not clear calipers. I see this Speedway kit has 11-1/4" rotors. How much is the total diameter with caliper? I have a total of 12-3/8" clearance inside my Cragars. My axle flange offset is 2-3/8"

Milo
IL
November 07, 2014

Will this kit fit 15x10 deep dish Cragar Super Sport rims Hi, I purchased Wilwood brake kit 835-1407139 the rotors are 12.19". With calipers bolted on, my Cragars would not clear calipers. I see this Speedway kit has 11-1/4" rotors. How much is the total diameter with caliper? I have a total of 12-3/8" clearance inside my Cragars. My axle flange offset is 2-3/8"

Answers

November 10, 2014
EricM
This bolt on disc brake kit for the 9” Ford uses a 11 ¼" rotor and adding in the caliper thickness nets 14” as the minimum requirement for wheel ID. We apologize but do not have a 9" rear disc brake kit that will work with your wheels at 12 3/8" ID.
1 answers

what is the rotor face thickness? rotor face as in where it would bolt to the axle

slimshady
November 02, 2014

what is the rotor face thickness? rotor face as in where it would bolt to the axle

Answers

November 03, 2014
EricM
The rotor is .236" thick where it rests between the axle and wheel.
1 answers

1978 lincoln versallis factory disc brakes My e-brakes are a pita and will your kit work on my housing without changing the track width?

tires2burn
August 31, 2014

1978 lincoln versallis factory disc brakes My e-brakes are a pita and will your kit work on my housing without changing the track width?

Answers

September 02, 2014
EricM
This kit will only work with axle off sets in the range of 2-3/8" to 2.5". The hole in the center of the rotor which is the axle register on the rotor is 2.78" and the maximum axle flange OD is 6 1/4". Check these dimensions on your axle to be sure that this kit will work for you.
1 answers

caliper bracket - which orientation The bracket that holds the caliper in this kit has 2 welded bosses that stick out one side of the plate. When assembled, do these bosses point toward the wheel or the centre of the vehicle ? I think we have them the wrong way around, with disk pad hitting the boss.

timewr
May 21, 2014

caliper bracket - which orientation The bracket that holds the caliper in this kit has 2 welded bosses that stick out one side of the plate. When assembled, do these bosses point toward the wheel or the centre of the vehicle ? I think we have them the wrong way around, with disk pad hitting the boss.

Answers

May 21, 2014
Travisp
The welded bosses on the caliper bracket need to face to the center of the vehicle. There is a good picture of this on the illustration on the website.
1 answers

Will this kit fit on 1966 Mustang The car has lowered leaf springs

Mustang714
Huntington Beach
May 03, 2014

Will this kit fit on 1966 Mustang The car has lowered leaf springs

Answers

May 05, 2014
EricM
This kit will work on nearly all 8 and 9 inch Ford applications. The lowered springs should not be an issue but on occasion a shock relocating kit or staggered shocks may be an issue. The calipers can be mounted ahead or behind the axle as needed for clearance without sacrificing any stopping power.
1 answers

Rotor wheel stud hole size? I bought a ford 9" housing for my g-body and it has large diameter course threaded studs (not sure exactly on dimensions) but if the rotors you supply do not fit can I get them machined too fit safely?

Koda1992
January 28, 2014

Rotor wheel stud hole size? I bought a ford 9" housing for my g-body and it has large diameter course threaded studs (not sure exactly on dimensions) but if the rotors you supply do not fit can I get them machined too fit safely?

Answers

January 29, 2014
EricM
These 5 on 4 1/2" pattern will accept 1/2" studs and the 5 on 4 3/4" pattern will accept 7/16" studs. If your studs are larger than this you could drill the holes larger.
1 answers

Will not work with leaf springs? I have a 1963 Ford Thunderbird. One of the reviews stated that this will not work with the leaf spring rear end. is this true?

ddetinne
CA
February 20, 2013

Will not work with leaf springs? I have a 1963 Ford Thunderbird. One of the reviews stated that this will not work with the leaf spring rear end. is this true?

Answers

February 20, 2013
Jason
Speedway’s 9” rear disc brake kit with E brake under number 91031921 works on most 9” applications including parallel leaf springs. This is dependent on the distance from the housing flange to the leaf springs. On our website under the purple print pdf instruction file you will find a picture of the kit installed for comparison to your existing clearance. The buggy spring application referenced in a review on our website placed the perch brackets very close to the housing flange causing interference. If you were to swap the kit side to side to place the calipers ahead of the axle then the E-brake cables would need to loop and come back to the calipers from the rear which is usually not desirable. We suggest comparing the photo on our website in the instruction file to your existing clearance prior to ordering
1 answers

what componants are needed to hook up to factory 9 inch rearend brake lines?

mikeys
November 20, 2012

what componants are needed to hook up to factory 9 inch rearend brake lines?

Answers

November 21, 2012
Jason
The hard lines to the wheel cylinders will have to be cut and shortened as flex lines will be needed to the calipers to allow them to float. Depending on the length of flex lines you need we offer one complete kit under number 6178561 that has 16” flex lines. If you prefer shorter then a pair of 91034843-3 in 8” along with 6174129 to mate to your hard lines, and then a banjo kit number 6172950 and the line tabs number 91031310 could be used. Other lengths of flex line are available. The 3/16” hard line will need to have a thread nut number 91031820 slid onto the shortened line and then 45 degree double flared for hook up to the flex lines.
Page 1 of 2

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