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#91032004
Ford 9 Inch Rearend Bolt-On Performance Rear Disc Brake Kit
- Performance disc brake stopping power for your Ford 9 Inch rearend at an economical price
- Kit includes replacement bearing retainers with bracket mounting provisions, caliper brackets, 11.75" Pro-Lite rotors, AFCO F88 four-piston calipers, brake pads, and hardware
- Fits on axles using Big Ford New Style bearings
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Product Summary
Ford 9 Inch, Rear Position, 11.75 Inch Rotor Diameter
- Performance disc brake stopping power for your Ford 9 Inch rearend at an economical price
- Kit includes replacement bearing retainers with bracket mounting provisions, caliper brackets, 11.75" Pro-Lite rotors, AFCO F88 four-piston calipers, brake pads, and hardware
- Fits on axles using Big Ford New Style bearings
- Rotor hats have a 1.96" offset with 5 on 4-1/2", 5 on 4-3/4", and 5 on 5" bolt circles
- AFCO F88 calipers feature four staggered forged pistons and a 30% stiffer design to provide a major stopping power upgrade, better feel, and the least amount of drag
Comes as a Kit
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Key Specs
| Position | Rear |
| Bolt Pattern | Multi: 5 on 4.5" | 4.75" | 5" |
| Rotor Diameter | 11.75 Inch |
| Rotor Type | Vented |
| Caliper Pistons | Four |
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Speedway Motors 91032004 Details
Replace those old drum brakes with modern rear disc brakes. Designed for high-performance applications, this kit includes AFCO F88 forged aluminum brake calipers with staggered forged pistons, a stiffer body, and less drag. Mounts .81" x 11-3/4" Pro-lite vented iron rotors and calipers to a Ford 9" rear end with Big Ford New Style bearings. Complete with rotors, hats, AFCO F88 calipers, bearing retainers, brake pads, caliper brackets, and slider bolts.
Steel hat fits 5 lug hubs with 4-1/2", 4-3/4", or 5" bolt circle.
Kit Includes:
(2) Pro-Lite Vented Brake Rotors, 11.75 x .81 Inch
Every rotor is cast from premium grade, long grain carbon iron which exhibits long wear, high thermal stability, and excellent resistance to distortion in high heat. Modern foundry and machining techniques hold close tolerances on face and vane thickness. Combining the correct face thickness with a 32 vane casting provides superior heat management and long service life with low rotating and unsprung weight. The straight vane design also makes it possible to use the same rotor on left or right hand mounting locations.
- Thickness: GM .810"
- Outside Diameter: 11.75"
- # Holes: 8
- Bolt Circle: 7"
- Thread: Thru
- Weight: 8.00 lbs
(2) AFCO F88 Forged Aluminum Calipers
AFCO's F88 forged aluminum brake caliper has been produced to provide you with the best caliper in asphalt racing. This F88 caliper is 30% stiffer to give a better feel on and off the brakes to allow the least amount of drag. This F88 caliper is designed to be used with an .810" wide rotor with a 3.5" bolt pattern. The caliper has 1-1/4" x 1-3/8" staggered forged pistons.
- 30% stiffer
- 1-1/4" x 1-3/8" staggered forged pistons
- Forged truly round pistons
- Left side
- Stainless steel abutment plates
- Forged caliper body
- One-piece high flow bleeders (use 7/16" wrench)
- Internal cross over passages
- Extreme duty bridge bolts
(1) Set of AFCO C1 Compound Brake Pads for F88 Calipers
The C1 brake pad compound was designed and developed to meet the braking needs of medium to high temperature racing applications. As brake system temperatures quickly increase and decrease, C1 provides consistent performance while remaining fade resistant. C1 has proven to be extremely rotor friendly and provides exceptional pad life without requiring lengthy pad break-in (bedding) procedures.
C1 is widely used in dirt track racing and is the ultimate pad for all medium temperature applications. Recommended temperature use: 400-900 degrees.
- High torque with excellent control qualities
- User friendly/easy break-in
- Exceptional pad and rotor wear
- Made in the U.S.A.
- Sold as a set of 4
These brake pads from Afco are designed to fit the new F88 caliper or a standard SL style caliper. The C1 pad compound is designed for medium to low brake temperatures and provide good cold bite while being rotor friendly.
Best used on:
- Front of dirt late models
- Rear of asphalt late models
- Any drilled rotor
Tech Tip: Only use full metallic pads on coated rotors.
Learn how to properly Bed-In your brake pads by reading our tech article. Bedding-In Brake Pad Procedure.
(2) Wilwood 170-0208 Rear Brake Drag Hats
Willwood brake hats have a long-standing reputation for fit, performance, and durability. Manufactured from premium grade aluminum alloys offering high strength and low weight.
(1) AFCO Shim Kit for F88 Calipers
These shim kits are intended to service F88, F33, and F22 forged aluminum AFCO calipers.
Racer Note: Racing brake calipers, if properly maintained, can generally be used for several racing seasons. Frequent replacement of the caliper pistons and seals will increase caliper life and performance.
(1) Mounting Components Kit
This has all of the other necessary components to mount the AFCO F88 brake calipers.
- Bearing retainers with caliper bracket mounting provisions
- Caliper brackets
- Caliper bracket shims for proper alignment
- Mounting hardware
Charts
Guides & Documents
Speedway Motors 91032004 Specifications
Speedway Motors 91032004 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 91032004 |
| Brand | Speedway Motors |
| Position | Rear |
| Bolt Pattern | Multi: 5 on 4.5" | 4.75" | 5" |
| Rotor Diameter | 11.75 Inch |
| Rotor Type | Vented |
| Caliper Pistons | Four |
| Caliper Finish | Natural |
| Color | Gray |
| Parking Brake Provision | No |
| Minimum Recommended Wheel Diameter | 15 Inch |
| Rotor Shape | Round |
| Hardware Included | Yes |
| Rotor Style | Plain Face |
| Front Rotor Included | No |
| Front Caliper Included | No |
| Rear Caliper Included | Yes |
| Front Spindles Included | No |
| Master Cylinder Included | No |
| Brake Booster Included | No |
| Brake Hoses Included | No |
| Rear Rotor Included | Yes |
| GENERAL | |
| Bore Size | 1.375" |
| Bore Size 2 | 1.25" |
| Rotor Hat Bolt Pattern | 8 x 7.00" |
| Outside Diameter | 13.88" |
| Rotor Drum I.D. | 6.14" |
| Rotor Thickness | 0.81" |
| Rotor I.D. | 6.38" |
| Rotor Backspace | 1.96" |
| Stud Diameter | 0.52" |
| Inside Diameter | 3.06" |
| Sold in Quantity | Kit |
| Axle Flange Offset | 2.50" |
| Mount Type | Bolt-On |
| Total Piston Area | 2.72 sq. in. |
| Brake Pad Compound | C1 |
| Caliper Type | AFCO F88 |
| Rotor Finish | Natural |
| Rotor Material Type | Cast Iron |
| Vane Count | 32 Straight Vane |
| Hat Type | Drag Hat- Standard |
| Hat Finish | Black E-Coat |
| Hat Bolt Circle 3 | 5 x 5.00" |
| Hat Bolt Circle 2 | 5 x 4.75" |
| Hat Bolt Circle 1 | 5 x 4.50" |
| Stud Diameter 3 | 0.52" |
| Stud Diameter 2 | 0.52" |
| Hat Material Type | Aluminum |
| Hat Offset Dimension | 1.96" |
| Rotor Hat Material | Aluminum |
| Brake Lines Included | No |
| Parking Brake Cables Included | No |
| Mounting Bracket Included | Yes |
| Ford Bearing End Style | Big Ford New Style (Torino) |