Wilwood's Forged Dynalite rear parking brake kit, in this drilled-red configuration, converts a Big Ford New Style axle housing to disc brakes. It pairs forged billet four-piston calipers with a 12.19 in./309.63mm vented rotor, and the 12.19" drilled and slotted one-piece rotors and BP10 SmartPads are built for balanced braking. The parking function comes from an internal shoe parking brake that provides excellent static holding power, so a buyer doesn't need a separate parking system. Because the kit is sized for a 2.50 axle offset, it suits owners searching for a Big Ford new style 2.50 offset rear disc conversion.
The offset is the main reason to buy this kit instead of a generic setup. The manufacturer calls the offset dimension critical to ensure proper alignment of the rotor to the caliper, so a mismatched housing can't simply be forced to work. The kit is also rated for 15 in. minimum wheel diameter on the solid-rotor variant of this kit, which helps narrow wheel selection for a 9-inch rear swap. The package does not include the master cylinder, brake booster, or brake hoses, so budget for those separately when pricing the conversion.
The manufacturer lists this kit for Big Ford New Style flanges with a 2.50 axle offset and advises verifying fitment on its website before ordering.
The manufacturer's install sheet for this Big Ford New Style configuration says to install a new parking brake cable, because the original cable may not adapt to Wilwood calipers. It also notes that OEM rubber brake hoses generally cannot be adapted to Wilwood calipers.
According to the manufacturer's Big Ford New Style install sheet, the hat is drilled for 1/2 in. wheel studs, while some OEM axles use 7/16 in. studs. The manufacturer recommends upgrading to 1/2 in. studs.
Wilwood's install sheets state that installation should be performed only by people experienced with disc brake systems, and this kit is best suited to a builder comfortable with axle work. Before final assembly, verify the axle flange offset against the kit's 2.50 in. rating, since the manufacturer says that dimension drives rotor-to-caliper alignment. Per the manufacturer's Big Ford install sheet, torque the hat-to-rotor bolts to 180 in-lb and safety wire them with 0.032 in. stainless wire. Use the same number of shims on the top and bottom caliper mounting bolts, apply red Loctite 271 to the mounting bolt threads, torque them to 30 ft-lb, and safety wire them. Install the pads with the steel backing plate facing the caliper pistons. Gotchas: budget for a new parking brake cable, a master cylinder, and brake lines, and plan a full brake bleed after assembly.
