Basic Weld-On Rear Disc Brake Kit for 1978-88 GM Caliper, 1.59 In BS

2 Questions

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

$270.13

In Stock

$306.34

Save $36.21

Add to a list

Select a vehicle to verify Fitment

Select Vehicle

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 1.59" offset CNC machined aluminum brake hat accommodates 5 on 4-1/2, 4-3/4", and 5 on 5" bolt circles

Comes as a Kit

View Kit Components

See more details

Key Specs

Position	Rear
Bolt Pattern	Multi: 5 on 4.5" \| 4.75" \| 5"
Rotor Diameter	11.75 Inch
Rotor Type	Vented
Parking Brake Provision	No

See more specs

Need To Know

This Product Will Ship Free

Need help?

Quick and Easy Returns

Speedway Motors 91031915 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, aluminum brake hats (1.59" backspace), and rotor bolts.

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

Charts

910-31915 Instructions (PDF)

Guides & Documents

Disc Brake Kits Instruction Sheet (91031915)

Brake Rotors Guide/Document (91031906)

Brake Rotor Hats Guide/Document (8351700317)

Speedway Motors 91031915 Specifications

KEY SPECS
MFG. Part #	91031915
Brand	Speedway Motors
Position	Rear
Bolt Pattern	Multi: 5 on 4.5" \| 4.75" \| 5"
Rotor Diameter	11.75 Inch
Rotor Type	Vented
Parking Brake Provision	No
Rotor Shape	Round
Hardware Included	Yes
Front Rotor Included	No
Front Caliper Included	No
Rear Caliper Included	No
Front Spindles Included	No
Master Cylinder Included	No
Brake Booster Included	No
Rear Rotor Included	Yes

GENERAL
Rotor Hat Bolt Pattern	8 x 7.00"
Rotor Thickness	.81"
Rotor I.D.	3.06"
Rotor Backspace	1.59"
Thread Pitch	7/16"-20
Finish	Natural
Sold in Quantity	Kit
Notes	For 3" rear end tube. Includes rotors, rotor hats, rotor bolts, and caliper brackets.
Rotor Material Type	Cast Iron