Complete Disc Brake Kit 1937-48 Ford, 5 on 5-1/2 BC

#91031909

Complete Disc Brake Kit 1937-48 Ford, 5 on 5-1/2 BC

Name: Complete Disc Brake Kit 1937-48 Ford, 5 on 5-1/2 BC
Brand: Speedway Motors
SKU: 91031909
Price: 420.99 USD
Availability: InStock
Rating: 4.7 (68 reviews)

68 Reviews

49 Questions

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

$420.99

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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

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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)

Guides & Documents

Disc Brake Kits Installation Instructions (91031909)

Everything You Need to Know About Converting Drum Brakes to Disc

Brake Caliper Brackets Installation Instructions (91631909)

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

68 Reviews

Overall Assessment

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.

Write A Review

4.7

68 reviews

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

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would buy again

5.0

a month ago

toy box

archie mo

Verified

was a perfect fit on the 38,had to cut bolts a little long binded on axel no big deal great price

Would Recommend

Yes

4.0

5 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

6 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

7 months ago

misfit

Verified

I am very pleased with the instilation process. I can use my stock 40 Ford wheels.

Would Recommend

Yes

5.0

8 months ago

40 chevy

Louisiana

Verified

Everything went really good and the fit was perfect

Would Recommend

I would recommend this product

5.0

10 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

2 years ago

Pete

Verified

Easy install , instructions were simple

Would Recommend

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Questions & Answers

49 Questions • 16 Answers

Sort Questions

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

• 8 years ago

1 answer

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Looking for replacement banjo bolts.thanks.

by Maxwell

• 8 years ago

1 answer

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Looking for replacement banjo bolt and crush washers for the calipers in this kit.

by Maxwell

• 8 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

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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

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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