Basic Weld-On Rear Disc Brake Kit for 1978-88 GM Caliper, 3 In BS
Basic Weld-On Rear Disc Brake Kit for 1978-88 GM Caliper, 3 In BS
Speedway Motors

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#91031925

Basic Weld-On Rear Disc Brake Kit for 1978-88 GM Caliper, 3 In BS

  • Replace those old drum rear brakes with modern disc brakes using this universal weld on disc brake kit
  • Features reinforced weld on brake brackets for use with GM Metric brake calipers
  • 11.75" OD vented rotors which are .81" thick ensure cool operation for fade free braking performance
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Type:

3 Inch Steel Hat / Metric Caliper

3 Inch Steel Hat / Standard Caliper1.96 Inch Aluminum Hat/ Standard Caliper

$220.99

/kit

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Product Summary

Universal Fit, Rear Position, 11.75 Inch Rotor Diameter

  • Replace those old drum rear brakes with modern disc brakes using this universal weld on disc brake kit
  • Features reinforced weld on brake brackets for use with GM Metric brake calipers
  • 11.75" OD vented rotors which are .81" thick ensure cool operation for fade free braking performance
  • This basic kit includes rotors, brake hats, and caliper brackets to allow you to choose your own calipers
  • The 3" backspace steel brake hat accommodates 5 on 4-1/2, 4-3/4", and 5 on 5" bolt circles

Comes as a Kit

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Key Specs

MFG. Part #91031925
PositionRear
Wheel Bolt Pattern (in.)5x4.5 in. | 5x4.75 in.
Wheel Bolt Pattern (mm)5x114.3 mm | 5x120.65 mm
Rotor Diameter11.75 Inch
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Speedway Motors 91031925 Details

Replace those old drum brakes with modern rear disc brakes. Included steel caliper brackets weld to your 3" tube rearend, making this a universal kit for a variety of applications. Basic kit includes caliper brackets for '78-'88 GM metric car front calipers, Pro-lite vented .810" x 11-3/4" iron rotors, steel brake hats (3" backspace, 6-1/4" I.D.), and rotor bolts.

Hat fits 5 on 4-1/2", 5 on 4-3/4" and 5 on 5" bolt circles.

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Speedway Motors 91031925 Specifications

KEY SPECS
MFG. Part #91031925
BrandSpeedway Motors
PositionRear
Wheel Bolt Pattern (in.)5x4.5 in. | 5x4.75 in.
Wheel Bolt Pattern (mm)5x114.3 mm | 5x120.65 mm
Rotor Diameter11.75 Inch
Rotor TypeVented
Parking Brake ProvisionNo
Minimum Recommended Wheel Diameter15 Inch
Rotor ShapeRound
Hardware IncludedYes
Rotor StylePlain Face
Front Rotor IncludedNo
Front Caliper IncludedNo
Rear Caliper IncludedNo
Front Spindles IncludedNo
Master Cylinder IncludedNo
Brake Booster IncludedNo
Brake Hoses IncludedNo
Rear Rotor IncludedYes
FinishNatural
Rotor Hat Bolt Pattern8 x 7.00"
Bolt Pattern5x4.5 | 5x4.75 | 5x5
GENERAL
Sold in QuantityKit
NotesIncludes rotors, rotor hats, caliper brackets, hardware, and instruction sheets.
Rotor Thickness0.81"
Thread Pitch7/16"-20
Rotor Material TypeCast Iron

Ratings & Reviews

5

5 Reviews

Overall Assessment

Customers positively review the product for its easy installation and adaptability, specifically praising its axle bracket and multi-pattern bolt compatibility. Race car enthusiasts find it a valuable addition, and customers commend the upgrade feature in regards to using it as a rear brake and easy conversion to a parking brake. Problems witnessed with rotor hats were rectified with a high-quality replacement, demonstrating the company's commitment to customer satisfaction. The transition from drum brakes to this product resulted in significant improvement, leading to recommendations for repeated purchase. The product notably outperforms competitors in terms of quality, adaptability, and upgrades.

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Weld on disk brake review.

5.0

5 years ago

'49 3100 Build

Mississippi

Verified

Easy to install axle bracket. Hat works great for a variety of bolt patterns.

Would Recommend

Great service

5.0

8 years ago

Webn1027

Pioneer, TN

Verified

Good addition to the race car!

Would Recommend

Great service brake rotor hats

5.0

9 years ago

Gib

Shadyside Ohio

Verified

Had a problem with runout on rotors,determined the hats were not made correctly,Speedway had me return them,sent me an upgraded product,at no additional cost,and shipped them back in a very timely matter.This is just one of the many reasons I feel confident, and enjoy dealing with Speedway. Thank You Gilbert Patt

Would Recommend

Good brakes

5.0

9 years ago

Moe

Mt

Verified

Great way to have rear discs and easy to upgrade to parking brake with a simple caliper change

Yes I would buy this product again

5.0

9 years ago

Wild Bill

Kannapolis nc

Verified

Did away the drum brakes great improvement

Would Recommend

Showing 5 of 5 reviews

Questions & Answers

7 Questions • 7 Answers

Can I run 80-85 Cadillac calipers with an e-brake on these brackets?

by Ed

• 8 years ago

1 answer

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Will this work with moser 33 spline axels?

by Randy

• 9 years ago

1 answer

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Does this product fit a ford 9inc rear end? I have metric calipiers & need to know if they will fit?

by Mike

• 9 years ago

1 answer

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will this kit clear 14x7 American racing 14" wheels with std offset?

by mikey

• 9 years ago

1 answer

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I have a 6 inch axle dia what rotor hat will fit over it.

by scotty

• 10 years ago

1 answer

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The discription says it will fit a 6.25 axle flange, and the directions say 5.75 max. which would be correct? My flange is 6.20 on a set of Strange dana 60 axles.

by Yogi

• 11 years ago

1 answer

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will this kit work with the standard GM D52 brake calipers and 15x8 truck rallies?

by Bigblockc10

• 11 years ago

1 answer

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