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Add confident rear braking capacity for heavy street and towing duty
Wilwood 140-14559 combines six-piston TX6R calipers with large GT slotted rotors and application-specific braided lines for a balanced rear brake upgrade. The kit retains the factory parking-brake assembly while providing the thermal capacity and pedal response expected from a properly matched big-brake package.
Key Features
- Wilwood 140-14559: Six-piston TX6R radial-mount calipers with black powder-coat finish
- 15.50 x 1.38-inch GT slotted iron rotors with black e-coat hats
- Forty-eight-vane rotor design supports heat evacuation during repeated stops
- BP-22 compound pads are supplied for street and performance use
- Application-specific braided stainless flex line kit is included
- Designed to retain the original-equipment parking-brake assembly
Fitment
Use Wilwood 140-14559 only for the applications below. Confirm every listed qualifier and exclusion.
| Years | Make | Model | Details |
|---|---|---|---|
| 2013-2022 | Ford | F-250 Super Duty | 4WD; Single rear wheel (SRW); Rear axle; 20-inch minimum wheel diameter; Wheel clearance diagram must be checked |
| 2013-2022 | Ford | F-350 Super Duty | 4WD; Single rear wheel (SRW); Rear axle; 20-inch minimum wheel diameter; Wheel clearance diagram must be checked |
Specifications
| Detail | Value |
|---|---|
| Brand | Wilwood |
| Manufacturer Part Number | 140-14559 |
| Product Type | Brake Kits - Performance Slot |
| Kit Position | Rear axle |
| Caliper | TX6R radial mount, six piston |
| Caliper Finish | Black powder coat |
| Piston Bore Sizes | 1.62, 1.38, and 1.38 inches |
| Piston Area | 5.06 square inches |
| Rotor Diameter | 15.50 inches |
| Rotor Thickness | 1.38 inches |
| Rotor Surface | GT slotted |
| Rotor Material | Iron |
| Rotor Vane Count | 48 |
| Minimum Wheel Diameter | 20 inches |
| Brake Line Kit | 220-14166 |
| UPC | 889545081381 |
What's Included
- Rear TX6R six-piston calipers for Wilwood 140-14559
- Pair of 15.50-inch GT slotted rotors
- BP-22 brake pads
- Application-specific mounting brackets and hardware
- Braided stainless flex line kit
- Not included: Wheels and tires
- Not included: Brake fluid
- Not included: Front brake components
- Not included: Installation labor
About Wilwood
Wilwood Engineering develops application-specific braking systems, calipers, rotors, pedals, and hydraulic controls. Its TX6R truck packages combine forged multi-piston calipers with large directional rotors and matched hardware for demanding street, towing, and performance applications.
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FAQ
What is the 140-14559?It is a Wilwood TX6R rear big-brake package with black six-piston calipers, large slotted rotors, pads, mounting hardware, and braided lines for the listed Super Duty applications.
Which trucks does this rear brake kit fit?It is listed for 2013-2022 Ford F-250 Super Duty and F-350 Super Duty 4WD trucks with single rear wheels.
Does the kit fit dual-rear-wheel trucks?No. The current application is limited to single-rear-wheel trucks.
What wheel size is required?Wilwood specifies a minimum 20-inch wheel, and the current wheel-clearance diagram must still be checked before installation.
What type of rotors are included?The package uses 15.50 x 1.38-inch GT slotted iron rotors with 48-vane ventilation and black e-coat hats.
Are brake lines included?Yes. The application-specific braided stainless flex line kit is included.
Is the factory parking brake retained?Yes. The kit is designed around the original-equipment parking-brake assembly when installed on a verified application.
Who should install the kit?Brake work is safety-critical and should be completed by a qualified technician using the current Wilwood instructions, wheel-clearance diagram, and Ford service procedures.
Installation Instructions
- Confirm the truck is a listed 4WD single-rear-wheel application and verify the 20-inch minimum wheel size against the current Wilwood clearance diagram.
- Raise and support the vehicle safely, remove the rear wheels and original brake components, and retain the parking-brake parts required by the instructions.
- Install the brackets, rotors, calipers, pads, and braided lines in the specified orientation using the supplied hardware.
- Tighten all fasteners to the current Wilwood and Ford specifications, route the lines without contact, and bleed the hydraulic system with suitable fluid.
- Set the parking brake, confirm wheel and suspension clearance, bed the pads and rotors as directed, and verify safe braking before road use.
California Proposition 65 Warning: This product may expose you to chemicals known to the State of California to cause cancer and reproductive harm.
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