The Wilwood 140-10012-DR is a rear big brake kit built on the Forged Narrow Superlite 4R platform for Big Ford New Style housing ends. This FNSL 4R kit fits the Big Ford New Style rear housing flange with a 2.50" axle offset. It combines two-piece 14-inch drilled and slotted rotors with lightweight aluminum hats, red powder-coated four-piston calipers, and BP-10 pads. Wilwood positions these rear kits as a complete big brake solution for popular muscle car rear axles that require a parking brake.
The main reason to choose this kit over a stock rear setup or a disc-only rear kit is the integrated parking brake. Its internal drum handles static holding, which matters if your build needs a working handbrake without a separate mechanism. The kit includes an internal drum parking brake for superior static holding power. Because the rear hardware is sized to pair with a front big brake upgrade, it helps keep braking balanced across the car. Searchers looking for a 14" Big Ford rear disc kit with parking brake, red calipers, and drilled rotors will find this part number matches that description.
The manufacturer states that rear brake kits are not supplied with hydraulic lines or fittings, so you may need to buy additional lines to complete the installation.
The manufacturer lists 18 inches as the minimum recommended wheel diameter for this kit. Check the manufacturer's wheel clearance diagram against your specific wheel before purchase.
The manufacturer recommends Wilwood Hi-Temp 570 grade fluid or higher. For severe braking or sustained high-heat use, the manufacturer recommends Wilwood EXP 600 Plus Racing Brake Fluid.
The manufacturer's assembly instructions for this kit state that disc brakes should only be installed by someone experienced with their installation and maintenance. Before starting, measure the axle flange dimension and confirm your wheel studs are 0.50 inch in diameter, since the hats are drilled for that size. During assembly, the rotor registration adapter slides onto the axle register with its smaller outer diameter facing the flange. The manufacturer leaves brake line routing to the installer's professional judgment, so plan your line routing and retention carefully. Finish by filling and bleeding the system with the recommended fluid. The parking brake cable (manufacturer part 330-9371) is listed separately, so confirm you have it before you start.
