Wilwood Rear Brake Kit: 14.25-inch Drilled/Slotted Rotors for Selected 1999–2020 GM Trucks / SUVs with OE Single-Piston Rear Brakes, Black AERO4

Black AERO4 calipers and BP-10 pads clamp the 14.25-inch drilled and slotted rotors in this rear package. It is configured for six-lug GM applications with original single-piston rear calipers, so dual-piston original brakes need a different verified selection. Calipers, brake rotors, master cylinders, valves, fittings and brake lines are among the disc brake systems and components Wilwood Engineering designs and manufactures. The Camarillo, California company was founded by Bill Wood in 1977 and supports motorsport, street-performance and specialized applications. Select individual components to meet the requirements of the complete brake system.

Technical Details

Kit contents and separate parts

• Manufacturer part number: 140-9407-D
• Supply: one kit with brake components for both sides of the rear axle
• Mounting hardware: included
• Hubs: not included
• Spindles, master cylinder and brake booster: not included
• Hydraulic hoses: not included
• AERO4 service calipers replace the specified OE single-piston rear arrangement; original parking hardware is reused.

Rotors and mounting dimensions

• Rotors: 14.25 in; 361.95 mm diameter x 1.25 in; 31.75 mm thick; vented Iron
• Friction faces: SRP Drilled & Slotted
• Rotor finish: Black Electro Coat
• Internal vanes: 48 straight
• Rotor/hat wheel-stud clearance patterns: 6 x 5.5 in; 6 x 139.7 mm

Calipers and friction components

• Calipers: AERO4; 4 pistons per caliper
• Caliper finish: Black Powder Coat
• Body construction: Forged aluminum
• Piston material: stainless
• Caliper mounting: radial
• Hydraulic inlet: 1/8-27 NPT
• Included pad compound: BP-10
• Listed piston bore sizes: 1.62 / 1.38 in

Fitment & Compatibility

Requires six-lug GM truck/SUV rear hardware originally equipped with single-piston calipers, retaining the OE internal parking brake. Consult the table below for individual Chevrolet, GMC and Cadillac applications; 2019 pickup entries are Silverado LD and Sierra Limited. The table also contains a 2007 Sierra Classic two-piston-rear entry, which conflicts with this kit requirement: do not select this kit for a dual-piston original rear system without Wilwood confirmation. Verify Police-package rear hardware directly. DS-571 specifies separate hoses 220-7699 for 1999–2006 and 220-11196 for 2007–2018; verify later listed vehicles individually. Nominal minimum wheel diameter: 18 in; 457.2 mm. Compare the actual wheel barrel and spokes with the linked clearance drawing; diameter alone does not establish fit.

Installation documents

• Installation instructions

WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.

For help matching the axle, spindle and brake components, contact PMB Performance. Our team brings over 20 years of experience in brakes and vehicle restoration.

Vehicle Applications

Application Notes

1. For OE rears with single piston calipers.
2. This rear brake kit requires rear-specific hoses. DS-571 specifies 220-7699 for 1999–2006 applications; verify length, fittings and routing.
3. Line kit included (manufacturer): None
4. Rear hose references from DS-571: 220-7699 for 1999–2006 and 220-11196 for 2007–2018. Hoses are separate; verify later listed vehicles individually.
5. For this rear kit, DS-571 specifies 220-11196 hoses for 2007–2018 applications. Front-kit hose numbers do not establish rear fitment.
6. This kit requires original single-piston rear brakes. Do not use it on an original dual-piston rear application without specific confirmation from Wilwood.