Menu

Shop

Garage

Cart

Account

Products to Compare (max of 3)
X
Compare These Parts
Add to Cart
$158.99
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

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

Universal Fit, Rear Position, Multi: 5 on 4.5" | 4.75" | 5" Bolt Pattern, Vented Rotor Type

5 Reviews | 7 Answered Questions
In Stock
Ships FREE
STORE PICKUP
Availability
Store Pickup Availability
X
Lincoln, NE -
Phoenix, AZ -
Select your vehicle to verify fitment.
Select Vehicle
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
Basic Weld-On Rear Disc Brake Kit for 1978-88 GM Caliper, 3 In BS
X
Basic Weld-On Rear Disc Brake Kit for 1978-88 GM Caliper, 3 In BS
Zoomed In Image
Part # 91031925
$158.99
kit
Call to Order
Add to Buildlist
Compare
Details
What's In The Kit
Reviews
Q&A
Videos & Articles
  • 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

Build Your Kit

You're almost there! This kit has an option or two for you to select. Let us know which options you want for your new kit.
Next
Add to Cart

Details

Position:
Rear
Bolt Pattern:
Multi: 5 on 4.5" | 4.75" | 5"
Rotor Diameter:
11.75 Inch
Rotor Type:
Vented
Parking Brake Provision:
No
MFG. Part #:
91031925
Rotor Hat Bolt Pattern:
8 x 7.00"
Rotor Thickness:
.81"
Rotor Shape:
Round
Thread Pitch:
7/16"-20
Finish:
Natural
Hardware Included:
Yes
Sold in Quantity:
Kit
Notes:
Includes rotors, rotor hats, caliper brackets, hardware, and instruction sheets.
Rotor Material Type:
Cast Iron
Front Rotor Included:
No
Rear Rotor Included:
Yes
Front Caliper Included:
No
Rear Caliper Included:
No
Front Spindles Included:
No
Master Cylinder Included:
No
Brake Booster Included:
No

Info

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.

Notes

Brake pad and caliper installation note:  

This bracket features a 90 degree bend in the bracket at the slider bolt threaded area for additional caliper support.  This part of the bracket may or may not interfere with the corner of the inner brake pad backing plate due to differences in brake pad manufacturers.  When this occurs, it will be necessary to simply remove a minimal amount of backing plate material at each corner of the inner brake pad to allow for the necessary clearance between the bracket and brake pad when the caliper and pads are fully installed.

Charts

910-31925 Instructions (PDF)

Instructions (PDF)

Important Messages

  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
Some parts are not legal for use in California or other states with similar laws/regulations

What's In The Kit

Each kit from Speedway Motors is carefully packaged and delivered right to your door. Below is a list of all the items you should expect to receive when you order this kit. Some of these items may also be available for sale individually if you're here looking for replacement parts.
  • Pro-Lite Vented Brake Rotor, 11.75 x .81 Inch
    Qty x 2
  • Speedway Stamped Steel Disc Brake Rotor Hat, 3 Inch Offset
    Qty x 2
  • Rotor Hat Bolt Set, 1/8 Inch Thick
    Qty x 2
  • Weld-On 1978-88 GM Metric Caliper Bracket
    Qty x 2
  • Instruct Sheet-Brake Kit
    Qty x 1
  • Speedway 1978-88 GM Metric Brake Pad Spacer
    Qty x 2

Reviews

Q & A

Videos & Articles
  • Just about any classic vehicle’s drum brakes can be upgraded to the increased braking performance of a disc brake system. Our Buyer’s Guide provides an overview of disc brake benefits and what you need to succeed with your upgrade.
  • When it comes to a traditional style build on an early hot rod it just has to be rolling on a solid front axle of some sort. In this buyer's guide we take you through I-beam and round tube solid axles, spindle choices, radius rod needs, and more.

You May Also Like

Error
X
Note
X
Ok