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#91031915
Basic Weld-On Rear Disc Brake Kit for 1978-88 GM Caliper, 1.59 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
$211.99
/kit
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This part is Backordered. We estimate this item will ship on or before July 20th.
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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 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
Key Specs
| MFG. Part # | 91031915 |
| Position | Rear |
| Wheel Bolt Pattern (in.) | 5x4.5 in. | 5x4.75 in. |
| Wheel Bolt Pattern (mm) | 5x114.3 mm | 5x120.65 mm |
| Rotor Diameter | 11.75 Inch |
Need To Know
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Return PolicySpeedway Motors 91031915 Details
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)
Speedway Motors 91031915 Specifications
Speedway Motors 91031915 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 91031915 |
| Brand | Speedway Motors |
| Position | Rear |
| Wheel Bolt Pattern (in.) | 5x4.5 in. | 5x4.75 in. |
| Wheel Bolt Pattern (mm) | 5x114.3 mm | 5x120.65 mm |
| Rotor Diameter | 11.75 Inch |
| Rotor Type | Vented |
| Parking Brake Provision | No |
| Minimum Recommended Wheel Diameter | 15 Inch |
| Rotor Shape | Round |
| Hardware Included | Yes |
| Rotor Style | Plain Face |
| Front Rotor Included | No |
| Front Caliper Included | No |
| Rear Caliper Included | No |
| Front Spindles Included | No |
| Master Cylinder Included | No |
| Brake Booster Included | No |
| Brake Hoses Included | No |
| Rear Rotor Included | Yes |
| Finish | Natural |
| Bolt Pattern | 5x4.5 | 5x4.75 | 5x5 |
| GENERAL | |
| Sold in Quantity | Kit |
| Notes | For 3" rear end tube. Includes rotors, rotor hats, rotor bolts, and caliper brackets. |
| Rotor Hat Bolt Pattern | 8 x 7.00" |
| Rotor Thickness | 0.81" |
| Rotor I.D. | 3.06" |
| Rotor Backspace | 1.59" |
| Thread Pitch | 7/16"-20 |
| Rotor Material Type | Cast Iron |
Ratings & Reviews
Ratings & Reviews
Questions & Answers
Questions & Answers
2 Questions • 2 Answers
Which way does the hat bolt to the rotor it looks like it can bolt both ways?
by Hodge
• 9 years ago
1 answer
View Answer
I have an 86 S10 rear end in my Monza. Im not sure what backspacing will work. It has 15" Bart (stock car) wheels on it. Do you see any issues I may encounter with this product?
by tomg
• 11 years ago
1 answer
View Answer
2 of 2 questions shown