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, Natural
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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
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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.
We get a lot of questions about brake kits so Tim gives a brief overview of disc brake setups.