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Six-Piston Braking for C10 and C15 Pro Spindles
Wilwood 140-15940-D is a front big brake kit for 1963-1987 Chevrolet C10 and GMC C15 trucks equipped with Wilwood one-piece Iron Pro drop spindles. It combines black Forged Narrow Superlite 6R calipers with 12.19-inch drilled and slotted one-piece hub rotors.
Key Features
- 140-15940-D uses six-piston radial-mount Forged Narrow Superlite 6R calipers.
- Black powder-coated calipers with stainless-steel pistons.
- 12.19 x 1.10-inch SRP drilled and slotted iron rotors.
- Dual 5 x 4.75-inch and 5 x 5.00-inch hub bolt circles with 1/2-20 studs.
- BP-10 street-performance brake pads included.
- Designed specifically for Wilwood one-piece Iron Pro drop spindles.
- Minimum 15-inch wheel diameter, subject to Wilwood wheel-clearance verification.
- Compatible brake flexline kit is required and sold separately.
Fitment
| Vehicle | Years and Requirements |
|---|---|
| Chevrolet C10 | 1963-1987; Wilwood one-piece Iron Pro drop spindles required |
| GMC C15 | 1963-1987; Wilwood one-piece Iron Pro drop spindles required |
This kit does not fit original-equipment spindles. Confirm spindle part number, wheel clearance, bolt circle, and brake-line selection before ordering.
Specifications
| Detail | Value |
|---|---|
| Brand | Wilwood |
| MPN | 140-15940-D |
| Position | Front |
| Caliper | Forged Narrow Superlite 6R |
| Pistons | 6 per caliper |
| Caliper finish | Black powder coat |
| Rotor diameter | 12.19 inches |
| Rotor thickness | 1.10 inches |
| Rotor style | Drilled and slotted |
| Rotor material | Iron |
| Hub material | Aluminum |
| Bolt circles | 5 x 4.75 inches and 5 x 5.00 inches |
| Minimum wheel diameter | 15 inches |
| Hub offset | +0.41 inch |
| UPC | 889545093919 |
What's Included
- Two 140-15940-D black six-piston front calipers
- Two 12.19-inch drilled and slotted rotor and hub assemblies
- BP-10 brake pads
- Caliper brackets and mounting hardware
- Dual-pattern hubs with wheel studs
About Wilwood
Wilwood designs performance brake systems around specific spindle, hub, caliper, and rotor combinations. The 140-15940-D package is engineered for early C-series trucks converted to Wilwood Iron Pro drop spindles.
Related Parts
- Wilwood Iron Pro drop spindle kit 831-15931 for 1963-1970 applications
- Wilwood Iron Pro drop spindle kit 831-15932 for 1971-1987 applications
- Compatible Wilwood front flexline kit 220-7056, 220-11237, or 220-12168
- Verify every related component for the specific truck before ordering with 140-15940-D.
FAQ
What is the 140-15940-D?
It is a six-piston front big brake kit with black calipers and 12.19-inch drilled and slotted hub rotors for compatible C10 and C15 trucks using Wilwood drop spindles.
Will this kit fit original factory spindles?
No. Wilwood specifies its one-piece Iron Pro drop spindles and states that the kit will not fit original-equipment spindles.
Does it fit both Chevrolet and GMC trucks?
Yes. Verified fitment covers 1963-1987 Chevrolet C10 and GMC C15 applications with the required Wilwood spindles.
What wheel size is required?
Wilwood lists a 15-inch minimum diameter, but the specific wheel must pass the published clearance template.
Are brake lines included?
No. A compatible Wilwood front flexline kit is required and sold separately.
Are the rotors drilled and slotted?
Yes. This configuration uses directional SRP drilled and slotted rotors.
What bolt patterns do the hubs support?
The hubs support 5 x 4.75-inch and 5 x 5.00-inch bolt circles with 1/2-20 studs.
Is the master cylinder included?
No. Wilwood designed the kit for compatible original-equipment master-cylinder output, but the master cylinder is not included.
Install Instructions
- Confirm the vehicle year, model, Wilwood Iron Pro drop spindle, wheel clearance, and selected flexline kit.
- Support the vehicle safely and remove the front wheels and existing brake components.
- Inspect and prepare the required Wilwood spindle assemblies according to their instructions.
- Install the supplied hubs, rotors, brackets, and calipers using Wilwood hardware and torque specifications.
- Install the BP-10 pads and verify rotor centering and caliper clearance.
- Connect the compatible front flexlines and route them clear of steering and suspension movement.
- Bleed the brake system with the specified fluid and inspect every connection for leaks.
- Check wheel clearance before final installation, then torque the wheels correctly.
- Bed the pads and rotors according to Wilwood procedures before normal driving.
Prop 65 Warning
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. Wilwood identifies this warning as applicable to the brake pads.
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