The Wilwood 140-13477 is a complete front disc conversion for 1970-1973 Mustangs, built around the Forged Dynalite-M (FDL-M) four-piston caliper and an 11.30-inch one-piece rotor. Wilwood's Classic Series front disc brake kits for 1970 to 1973 Ford Mustangs offer disc brake upgrade solutions for OEM drum or disc spindles. The calipers are Type III Hard Anodized Forged Dynalite Calipers, and the rotor comes as a one piece rotor and hub assembly, so there is no separate hub to source.
Choose this kit over stock drums or a cheaper bolt-on set when you want a firmer, more consistent stop on a classic Mustang that sees regular street or weekend use. Owners report that the kit works with your original drum spindle, and one owner described a clear improvement in stopping power over the factory drums. This is the undrilled, plain-face version. If you want a drilled and slotted rotor, the manufacturer sells that as a separate part number (140-13477-D).
The manufacturer says the kit can be used with either manual or power-boost master cylinders, and it lists a Min Wheel Diameter Req'd of 14 inches, so confirm your wheel clearance before ordering. Search terms buyers use include 1970-73 Mustang drum to disc conversion, FDL-M front brake kit, 11.30 vented rotor, and 140-13477 Mustang front brakes. Check fitment with Wilwood's vehicle lookup before you buy.
The manufacturer lists 140-13477 with undrilled rotors. The drilled and slotted version is sold as 140-13477-D, and the red-caliper configurations carry an -R suffix.
Yes. The manufacturer designed the kit for 70-73 Ford Mustang OEM Drum spindles, and it works as a disc upgrade on drum-spindle cars.
Yes. FDLM 1 piece kits can be used with either manual or power boost master cylinders.
Owners report that this kit goes on without drilling, and that only some simple hand tools were needed for the job. One owner noted that the installation instructions were very detailed. Before you start, confirm fitment on Wilwood's website and check that your wheels meet the 14-inch minimum. Plan for a complete front brake job, including the master cylinder setup and bleeding the system afterward.
