Wilwood Rear Dynapro Drag-Race Kit for Mustang S550 2015–2023, Drilled 12.90-Inch Steel Rotors

This S550 Mustang rear kit uses thin 12.90-inch drilled steel rotors and four-piston Dynapro radial calipers for drag racing. It eliminates the parking brake and is not recommended for street use. Wilwood Engineering is a Camarillo, California manufacturer founded by Bill Wood in 1977. Disc brake design and manufacturing extend across calipers, brake rotors, master cylinders, valves, fittings and brake lines. Parts for street-performance, specialized applications and motorsport must be selected to meet the requirements of the complete brake system.

Technical Details

• Manufacturer: Wilwood
• Manufacturer part number: 140-14106-D
• Kit classification: Rear Brake Kits - Drag Race
• Axle position: Rear Kits
• Brake Type: Disc
• Selling unit: Sold as a kit.
• Minimum wheel guidance (clearance drawing required): 17 in; 431.8 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: 12.90 in; 327.66 mm
• Rotor Thickness: 0.38 in; 9.65 mm
• Rotor Material: Steel
• Surface Type: Drilled
• Rotor construction: Solid
• 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
• Pistons per service caliper: 4
• Service-caliper piston construction: Stainless
• Service-caliper mount: Radial
• Caliper body construction: Billet aluminum
• Caliper Color: Anodize
• Caliper Finish: Type III Anodize
• Caliper Inlet Port Diameter: 1/8-27 NPT
• Caliper family: Dynapro radial
• Pad compound: BP-20
• Master Cylinder Included: No
• Brake Booster Included: No
• Brake Lines Included: No

Fitment & Compatibility

The rear drag-race conversion removes the parking brake and is not recommended for street use. Match the listed S550 Mustang trim and rear hub, without assuming GT350/GT500 compatibility. DS-1146 specifies separately supplied rear flexlines for the installation; the thin solid-steel rotors and dynamic mounts must be installed exactly as shown. A nominal 17-inch wheel still needs a clearance check.

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

Wilwood product specifications · Installation instructions

Our team at PMB Performance has over 20 years of parts and fitment experience. The existing component number and brake-system details help us check the match.