Wilwood Rear Superlite 4R Brake Kit for Jeep Wrangler JL, Black Calipers and 14-Inch GT Rotors, Retains Factory Parking Brake (Listed 2018–2025 Applications)

Black Superlite 4R service calipers and 14.00-inch GT slotted rotors form this Jeep Wrangler JL rear conversion. The documented original parking-brake mechanism remains in use; it is not the separate electronic parking-brake system found in Wilwood axle-conversion kits. BP-20 pads and 25-inch braided flexlines are supplied. Match the Wrangler trim/year row and check the 18-inch wheel clearance drawing. Founded by Bill Wood in 1977 and based in Camarillo, California, Wilwood Engineering designs and manufactures disc brake systems for motorsport, street-performance and specialized applications. Its calipers, brake rotors, master cylinders, valves, fittings and brake lines are selected to suit the complete braking system.

Technical Details

• Manufacturer part number: 140-15930. Quantity: one kit for the stated axle/application.
• Minimum nominal wheel diameter: 18 inches. The wheel must also clear the actual caliper and rotor profile in the installation drawing.
• 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.
• Service caliper: Forged Narrow Superlite 4R; 4 pistons; stainless piston material. Radial mounting, black 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.
• Included braided flexline kit: 220-15929 (25.00 in). Confirm the chassis fitting and routing for the actual installation.
• Mounting hardware and the specified pads are included. Spindles, master cylinder and brake booster are not supplied.
• Rear housing interface: OEM; axle offset: 0.00 in; 0 mm.

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.

PMB Performance has over 20 years of experience working with parts and fitment details. Provide the actual brake hardware, mounting dimensions and wheel measurements when requesting help with this conversion.

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.