Wilwood Red Superlite 4R Rear Brake System for Jeep Wrangler JL, 14-Inch GT Slotted Rotors and Braided Flexlines (Listed 2018–2025 Applications)

For the documented Wrangler JL rear setup, this red/GT kit adds Superlite 4R radial service calipers without replacing the original parking mechanism. The 14.00 × 1.25-inch slotted rotor rings, BP-20 pads and braided hoses are supplied for the conversion. It is intended to complement an appropriate larger front brake system. Check each trim/year entry, brake balance and wheel envelope before installation. Based in Camarillo, California, Wilwood Engineering was founded by Bill Wood in 1977. Its disc brake systems serve motorsport, street-performance and specialized applications. The range includes calipers, rotors, master cylinders, valves, fittings and brake lines, with each component chosen for its role in the complete brake installation.

Technical Details

• Manufacturer part number: 140-15930-R. Quantity: one kit for the stated axle/application.
• Service caliper: Forged Narrow Superlite 4R; 4 pistons; stainless piston material. Radial mounting, red powder coat finish.
• Published piston bores: 1.38, 1.38 inches. Supplied pad compound: BP-20.
• Caliper hydraulic inlet: 1/8-27 NPT.
• Uses the documented original parking-brake mechanism; this is not an electronic-parking conversion kit.
• Rotor specification: 14.00-inch outside diameter × 0.81-inch thickness; GT slotted faces. Iron construction; GT 36 Straight Vane design; published vane configuration: 36 V.
• Rotor hats: iron, black e-coat finish; Parking Brake Hat - Standard. Hat offset: 2.200 inch.
• No replacement wheel hubs are supplied; retain or provide the documented matching hub arrangement.
• Wheel mounting pattern: 5 x 5.00 inches.
• Rear housing interface: OEM; axle offset: 0.00 in; 0 mm.
• Included braided flexline kit: 220-15929 (25.00 in). Confirm the chassis fitting and routing for the actual installation.
• Minimum nominal wheel diameter: 18 inches. The wheel must also clear the actual caliper and rotor profile in the installation drawing.
• Mounting hardware and the specified pads are included. Spindles, master cylinder and brake booster are not supplied.

Fitment & Compatibility

This rear kit is for the Wrangler JL entries in the table; it is not a Gladiator rear kit. Exact trim ranges differ, including the listed 4xe and special-edition applications. It retains the documented original parking-brake mechanism, master-cylinder output and ABS operation where fitted. Check the existing parking brake and hub arrangement, rear brake balance, flexline routing and 18-inch wheel clearance before installation. Use the complete application table below for the individual year, submodel, brake configuration and note attached to each entry.

For fitment assistance, send PMB Performance the vehicle details together with the installed spindle or axle configuration and wheel measurements. We draw on 20+ years of parts and fitment experience to help assess the combination.

Manufacturer documentation: Installation instructions.

Manufacturer Warning

Applicable to brake pads only: Wilwood warns of exposure to arsenic, cadmium, hexavalent chromium compounds, lead, nickel, cobalt and antimony trioxide, chemicals known to California to cause cancer or reproductive harm. More information: P65Warnings.ca.gov.