Wilwood 140-10012-DR FNSL4R Rear Big Brake Parking Kit Big Ford New Style 2.50"

Vehicle Fitment

• Big Ford New Style Rear Axle Flange - 2.50" Axle Offset
• Bolt Circle: 5 x 4.50", 5 x 4.75", 5 x 5.00" (0.52" stud diameter)

Fitment Notes

• This is a semi-universal kit designed to fit Big Ford New Style rear axle housings with a 2.50" axle flange offset. Verify your axle flange type and offset measurement before ordering.
• Minimum wheel diameter required: 18". Refer to Wilwood's wheel clearance diagram (DS574) to confirm fitment with your specific wheel.
• Does not fit rear ends with ABS or Traction Control.
• Not compatible with staggered shock applications - see Wilwood part 140-9560-DR for staggered shock fitment.
• OEM axles with 7/16" studs may require upgrading to 1/2" studs for proper fitment.
• Kit may fit additional vehicles - contact Wilwood Sales/Tech Support at (805) 388-1188 to confirm.

Features

• Forged Narrow Superlite 4R (FNSL4R) four-piston calipers deliver exceptional clamping force in a compact, lightweight forged body - ideal for big brake rear upgrades.
• 14.00" two-piece vented SRP Drilled and Slotted rotors maximize heat dissipation and bite for high-performance street and show builds.
• Internal drum-style parking brake system provides clean, concealed static holding power without external cables or visible hardware cluttering the install.
• Radial mount caliper design ensures precise pad-to-rotor alignment and consistent brake bias under load.
• Red powder coat caliper finish delivers a show-quality appearance and corrosion resistance right out of the box.
• Stainless steel pistons resist corrosion and maintain consistent caliper performance over long service intervals.
• Spec-37 iron rotor material with Black Electro Coat finish provides strength, durability, and excellent initial bite.
• Parking brake rotor hat features a multi-bolt-circle design (5x4.50", 5x4.75", 5x5.00") to accommodate a wide range of wheel setups.

Specifications

• Position: Rear (Left and Right)
• Caliper Type: Forged Narrow Superlite 4R (FNSL4R)
• Caliper Finish: Red Powder Coat
• Caliper Part Numbers: LH 120-11782-RD / RH 120-11782-RD
• Piston Count: 4 (dual 1.12" bore stainless pistons per caliper)
• Piston Area: 1.98 in²
• Brake Pad Plate: 7416 | Compound: BP-10 | Pad Area: 8.2 in²
• Rotor Diameter: 14.00" (355.6mm)
• Rotor Width: 1.10" (27.9mm)
• Rotor Style: SRP Drilled & Slotted | Vented | 72 Curved Vanes
• Rotor Material: Spec-37 Iron with Black Electro Coat
• Rotor Hat Material: Aluminum with Black E-Coat | Offset: 1.540"
• Rear End: Big Ford New Style Flange | Axle Offset: 2.50"
• Mount Type: Radial
• Minimum Wheel Diameter: 18"
• Bolt Circle: 5 x 4.50" / 5 x 4.75" / 5 x 5.00" | Stud Diameter: 0.520"
• UPC: 889545008333

Included Components

• 2x Forged Narrow Superlite 4R Calipers - Red Powder Coat (120-11782-RD)
• 2x SRP Drilled & Slotted 14.00" Vented Rotors - Black Electro Coat (LH: 160-8401-BK / RH: 160-8400-BK)
• 2x Parking Brake Hat - Aluminum, Black E-Coat (170-13539)
• 1x Set BP-10 Brake Pads (Pad Plate 7416)
• 1x Hardware Kit including bridge bolts, hat bolts (230-8008), and all required mounting hardware

Product Description

The Wilwood 140-10012-DR Forged Narrow Superlite 4R Big Brake Rear Parking Brake Kit is the ultimate rear disc upgrade for custom, show, and high-performance street builds using Big Ford New Style rear axle housings with a 2.50" flange offset. The FNSL4R four-piston calipers pair with massive 14.00" SRP Drilled and Slotted rotors to deliver stopping power that complements front big brake upgrades and the demands of high-horsepower builds. Red powder coat calipers add serious visual impact to match the performance.

The integrated internal drum-style parking brake system is neatly hidden inside the rotor hat, providing a clean installation with no external cables or mechanical clutter. The aluminum rotor hats feature a multi-bolt-circle design - accepting 5x4.50", 5x4.75", and 5x5.00" patterns - giving builders maximum flexibility across a wide variety of wheel setups. This kit is designed for rear ends without ABS or Traction Control, and requires 18" or larger wheels. Verify axle flange type, offset, and wheel clearance against Wilwood's DS574 diagram before installation.