Wilwood Rear AERO4/MC4 Parking-Brake Kit for Mustang 2015–2023, Black Calipers and 14-Inch Rotors

This rear Mustang conversion separates hydraulic service braking from mechanical parking-brake operation. Black AERO4 calipers work with 14-inch slotted rotors, while dedicated MC4 calipers provide the parking-brake connection. Camarillo, California is home to Wilwood Engineering, founded by Bill Wood in 1977. Wilwood designs and manufactures disc brake systems, with calipers, brake rotors, master cylinders, fittings, valves and lines serving motorsport, street-performance and specialized uses. Select individual parts to meet the needs of the complete brake system.

Technical Details

• Manufacturer: Wilwood
• Manufacturer part number: 140-13888
• Kit classification: Rear Brake Kits - Street Performance
• Axle position: Rear Kits
• Brake Type: Disc; Parking
• Selling unit: Sold as a kit.
• Pistons per service caliper: 4
• Service-caliper piston construction: Stainless
• Service-caliper mount: Radial
• Caliper body construction: Forged aluminum
• Caliper Color: Black
• Caliper Finish: Black Powder Coat
• Caliper Inlet Port Diameter: 1/8-27 NPT
• Caliper family: AERO4
• Pad compound: BP-20
• Master Cylinder Included: No
• Brake Booster Included: No
• Brake Lines Included: Yes
• Minimum wheel guidance (clearance drawing required): 18 in; 457.2 mm
• Required rear axle / flange: OEM
• Catalog axle-offset reference: 0.00 in; 0 mm
• Spindle Included: No
• Mounting Hardware Included: Yes
• Separate wheel hubs included: No
• Rotor Outside Diameter: 14.00 in; 355.6 mm
• Rotor Thickness: 0.81 in; 20.57 mm
• Rotor Material: Iron
• Surface Type: GT Slotted
• Rotor construction: Vented
• Bolt Circle Diameter: 5 x 4.5 in; 5 x 114.3 mm
• Catalog stud / mounting-hole reference: 0.630 in; 16.00 mm
• Rotor surface finish: Black Electro Coat
• Hat material: Aluminum
• Hat finish: Black E-Coat
• Hat offset dimension: 1.200 in

Fitment & Compatibility

This rear conversion is for the specific 2015–2023 S550 Mustang trims listed below; no unlisted Shelby application should be assumed. DS-1078 includes rear hose kit 220-13913 and parking-brake cable assembly 330-15137. The separate MC4 calipers must be correctly aligned and the cable travel adjusted; verify wheel clearance around both service and parking calipers.

Listed models: Mustang. Use the fitment table below for the individual years, submodels and equipment conditions.

Wilwood product specifications · Installation instructions

For fitment assistance backed by more than 20 years of experience, share the installed brake configuration with PMB Performance before ordering.