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#91031909
Complete Disc Brake Kit 1937-48 Ford, 5 on 5-1/2 BC
- Upgrade to big 11 3/4" rotors on your '37-'48 Ford car or '37-'47 Ford 1/2 ton pickup spindles and retain the original 5 on 5 1/2" bolt circle
- Wheels must have 3-7/16" center hole and be disc brake compatible
- Will work with spindles having either original steering arms or flat steel steering arms. Will NOT work with FORGED aftermarket steering arms
$419.99
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Product Summary
Front Position, 11.75 Inch Rotor Diameter, Natural
- Upgrade to big 11 3/4" rotors on your '37-'48 Ford car or '37-'47 Ford 1/2 ton pickup spindles and retain the original 5 on 5 1/2" bolt circle
- Wheels must have 3-7/16" center hole and be disc brake compatible
- Will work with spindles having either original steering arms or flat steel steering arms. Will NOT work with FORGED aftermarket steering arms
- Features 1971-76 Impala calipers with 2.81" bore for increased stopping performance
- Everything included to install at the wheel with exception of spindle nut kit sold separately; Pt# 910616004
Comes as a Kit
View Kit Components
Key Specs
| MFG. Part # | 91031909 |
| Position | Front |
| Wheel Bolt Pattern (in.) | 5x5.5 in. |
| Wheel Bolt Pattern (mm) | 5x135 mm |
| Rotor Diameter | 11.75 Inch |
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Speedway Motors 91031909 Details
This complete disc brake kit easily installs big 11-3/4" rotors on your 1937-1948 Ford car or 1937-1947 Ford 1/2 ton pickup spindles while retaining the original 5 on 5-1/2" bolt circle.
This kit will work with spindles having either original steering arms or with flat steel steering arms. It will NOT work with forged aftermarket steering arms. Wheels must have 3-7/16" center hole and have been designed for disc brake applications. Will NOT work with early Ford factory wire or steel drum brake wheels. You will need to use a later disc brake steel wheel or aftermarket wheel.
Item Details
'Ford 11-3/4" rotors to ''37-''47 Ford 1/2 ton pickup & ''37-''48 Ford car spindles'Charts
910-31909 Instructions (PDF)
Speedway Motors 91031909 Specifications
Speedway Motors 91031909 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 91031909 |
| Brand | Speedway Motors |
| Position | Front |
| Wheel Bolt Pattern (in.) | 5x5.5 in. |
| Wheel Bolt Pattern (mm) | 5x135 mm |
| Rotor Diameter | 11.75 Inch |
| Rotor Type | Vented |
| Caliper Pistons | One |
| Caliper Finish | Natural |
| Parking Brake Provision | No |
| Minimum Recommended Wheel Diameter | 15 Inch |
| Rotor Shape | Round |
| Hardware Included | Yes |
| Rotor Style | Plain Face |
| Front Rotor Included | Yes |
| Front Rotor Diameter | 11.75 Inch |
| Front Caliper Included | Yes |
| Rear Caliper Included | No |
| Front Spindles Included | No |
| Master Cylinder Included | No |
| Brake Booster Included | No |
| Brake Hoses Included | Yes |
| Rear Rotor Included | No |
| Bolt Pattern | 5 on 5.5" |
| Color | Natural |
| Front Caliper Finish | Natural |
| Front Caliper Piston Quantity | 1 |
| Application Type | 37-48 Ford Car Spindle |
| GENERAL | |
| Sold in Quantity | Kit |
| Notes | Includes rotors, bearings and seals, calipers, pads, brake hoses, brake tabs, and caliper brackets. |
| Front Suspension Type | Straight Axle |
Ratings & Reviews
4.7
67 Reviews
Customers praise the product for its quality, ease of installation, and compatibility with various models. Multiple reviews highlight the kit as comprehensive, eliminating the hassle of sourcing parts separately. Users appreciate the clear instructions and the kit's usability even for individuals not typically familiar with car work. However, some have mentioned the need for additional parts or minor modifications and adjustments for optimal fit. The ability to source replacement components from any auto parts store is valued. In contrast, there is a mixed response on the use of a proportioning valve: some found it unnecessary, while others recommended it. A few users found the calipers and brake lines to be of lesser quality and suggested purchasing these separately. Overall, customers are satisfied with the product and recommend it over competitors, and several users plan to repeat purchase for future projects.
Ratings & Reviews
4.7
67 Reviews
Customers praise the product for its quality, ease of installation, and compatibility with various models. Multiple reviews highlight the kit as comprehensive, eliminating the hassle of sourcing parts separately. Users appreciate the clear instructions and the kit's usability even for individuals not typically familiar with car work. However, some have mentioned the need for additional parts or minor modifications and adjustments for optimal fit. The ability to source replacement components from any auto parts store is valued. In contrast, there is a mixed response on the use of a proportioning valve: some found it unnecessary, while others recommended it. A few users found the calipers and brake lines to be of lesser quality and suggested purchasing these separately. Overall, customers are satisfied with the product and recommend it over competitors, and several users plan to repeat purchase for future projects.
4.7
67 reviews
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Most Liked Positive Review
4.0
Done in a day.
Everything fit pretty good. I had to grind down part of the casting on the calipers to get them to fit right, which is in the instructions. Also had to grind a slot into one of the brackets to clear a bolt on the drivers side. I wound up using the stock bearing cups that you're supposed to replace and just doubled up the washer between the wheel bearing and castle nut on the spindle. Used the old ones and new ones that came with the kit. Everything is snug and the cotter pin is doing it's job so I think that's an easier fix. Got it all done in about 6 hours including 2 trips to NAPA. Haven't driven the truck yet but we will see. Good kit for the price!
Most Liked Negative Review
2.0
5x5.5
Had to find wheels to fit on a car with the 5x5,5 disc brake kit
Filter by Ratings
Yes
4.0
2 months ago
Steve
Avon Park, Florida
Verified
Everything fit well and I could have finished the job in six hours if I didn't have to search for an adapter to make the stock brake line work. I would think the adapter would be included or the hose supplied would have a fitting that match the stock brake lines.
Would Recommend
Review
5.0
2 months ago
Harry
Richmond,ky
Verified
Disc Brakes for 1940 Ford Pick-Up
Would Recommend
glad i looked for the disc brake kit
5.0
3 months ago
misfit
co
Verified
I am very pleased with the instilation process. I can use my stock 40 Ford wheels.
Would Recommend
Yes
5.0
5 months ago
40 chevy
Louisiana
Verified
Everything went really good and the fit was perfect
Would Recommend
I would recommend this product
5.0
6 months ago
Smitty
Wainwright Alberta Canada
Verified
No complaints
Would Recommend
Excellent conversion
5.0
a year ago
Sunset
Driftless Area, Wisconsin
Verified
Easiest conversion I've seen. Used on a 41 Ford 1/2 ton and used a Summit kit previously on a 61 ford F100. Can't go wrong with this. Simple, easy to assemble. Quality parts. Would buy again.
Would Recommend
Fits with modifications.
4.0
a year ago
46 ford
Nor cal
Verified
Going on original46 ford front end. Needed some larger spacers for caliper mounts. No instructions came with kit , had to find them on speedway website.
Would Recommend
I would definitely buy this again if needed.
4.0
a year ago
Tim
Canada
Verified
Found it cheaper to go with this disc brake conversion kit then to rebuild my 1940 drum brakes. Obviously all offshore parts. But the quality seems good enough. Seriously can't beat it for the price.
Would Recommend
Yes
5.0
a year ago
Pete
Ca
Verified
Easy install , instructions were simple
Would Recommend
Would buy this kit again.
5.0
a year ago
Ken
Wyoming
Verified
Bought this kit to convert a stock 41 willys axle to disc brakes. Figured out that the ford round back spindles work great on the stock willys axle with some minor machine work. Have a set of 15x4 American 5 spoke magnesium wheels with the 5x5.5 bolt pattern. Thats the reason for buying this kit.
Would Recommend
Showing 10 of 67 reviews
Questions & Answers
Questions & Answers
49 Questions • 16 Answers
Does this kit change the track width of the front end compared to the original drum brakes? Asked another way, if identical backspace wheels are used will the front wheels/tires be further apart or closer together than stock? I realize that disc brake compatible wheels must be used. Car/axle in question is for a '48 Ford.
by lake_harley
• 7 years ago
1 answer
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Why wo t this kit fit a 1935 ford? Do you have a kit fir a 35 ford with the 5 x 5 1/2 bolt pattern? Thanks
by Richie
• 7 years ago
1 answer
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Looking for replacement banjo bolts.thanks.
by Maxwell
• 7 years ago
1 answer
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Looking for replacement banjo bolt and crush washers for the calipers in this kit.
by Maxwell
• 7 years ago
1 answer
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Looking for replacement wheel bearings kit for this set up, need some help.
by Keith
• 8 years ago
2 answers
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What is the stud size and thread pitch
by Sebastyon
• 8 years ago
3 answers
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I have a 48 Ford coupe that is an original. It has the 91031909 conversion kit. Do you have a rotor with bolt pattern 5 on 4.5 that will fit these spindals? I plan to upgrade to a 9 inch rear with 5 on 4.5 bp., and new wheels. Thanks
by JOHN
• 8 years ago
1 answer
View Answer
Do you have a part number for the master cylinder needed for this kit , along with residual and or proportioning valve .
by tom
• 8 years ago
2 answers
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Will this fit a 45 Ford 3/4 ton? My 52 F3 can use the F1 front disc conversions but lose the 8 lug for 5.. is this the same?
by Hanniballs
• 8 years ago
2 answers
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Does it matter if the calipers are positioned towards the front or rear? The caliper bracket is hitting my king pin lock nut. It's a stock axle with all stock hardware. I really don't want to try and remove the lock pin to turn it around since it has been in there for 70 years. I really don't want to break anything.
by Joe
• 8 years ago
2 answers
View Answers
10 of 49 questions shown
Fitment
Fitment
1937-1947 Ford 1/2 Ton Pickup
1939-1948 Ford Deluxe
1940 Ford Pickup
1937-1947 Ford Sedan Delivery
1939-1940 Ford Standard
1941-1948 Ford Super Deluxe