Ford 9 Inch Bolt-On Rear Disc Brake Kit w/ E-Brake
Ford 9", Rear Position, Dual: 5 on 4.5" | 4.75" Bolt Pattern, 11.25 Inch Rotor Diameter
- Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
Build Your KitYou're almost there! This kit has an option or two for you to select. Let us know which options you want for your new kit.
As featured on Classic Truck’s Week to Wicked. Watch the transformation here!
If you dont want to spend an arm and a leg on a rear disc brake kit and still have to weld the bracket on, weve 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".
910-31921 Instructions (PDF)
With emergency brake calipers threaded to accept 7-16"-20 banjo bolt.
- "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"
What's In The Kit
Speedway Replacement 11-1/4 Inch Rear Brake RotorPart # 91031039Qty x 2
GM Metric Disc Brake to 9 Inch Ford Bracket SetPart # 91031981Qty x 1
Ford 9 Inch Brake Bolt KitPart # 91031981-2Qty x 1
1978-Up GM Metric Emergency Brake Caliper, LH, 5.45 Mount BoltsPart # 91031046-LQty x 1
1978-Up GM Metric Emergency Brake Caliper, RH, 5.45 Mount BoltsPart # 91031046-RQty x 1
Instruction Sheet 91031902/91031921Part # 910319.INSTQty x 1
More Like This
Speedway 8 & 9 Inch Ford Disc Brake Conversion Kit w/ E-Brake
Speedway Ford 9 Inch Rearend Bolt-On Rear Disc Brake Kit
Speedway 9 in. Ford Truck Rear End Disc Brake Kit
AFCO 7250-0100 Ford 9 Inch Axle Brake Kit
Wilwood 140-7139 Rear Disc Brake Kit, Big Ford 9 Inch, Old 2.36 Offset
Wilwood 140-7140 Rear Disc Brake Kit, Big Ford 9 Inch New 2-1/2 Offset
Wilwood 140-7143 Rear Disc Parking Brake Kit, Ford 9 Inch, 2.66 Offset
Wilwood 140-2115-B Rear Brake Kit- Old Big Bearing Ford, 2.36 Offset
Wilwood 140-10012-DR FNSL4R 14 Inch Rear Parking Brake Kit, Big Ford
Wilwood 140-10012-P FNSL4R 14 In Rear Parking Brake Kit, Big Ford 2.50
Q & A
Day 1 afternoon update of the Speedway Motors and Classic Trucks Week to Wicked classic Chevy project.
The E-Stopp Electric E-Brake is an electronic push-button activated emergency brake option where the visible element is small and compact, and can replace the traditional hand or foot-operated emergency brakes.
After getting the control arms and drop spindles installed last time, we are dying to see what it looks like on the ground. Today we are working with the Speedway Deluxe Disc Brake Kit. Josh and Joe are on a roll!