Forged Narrow Superlite 4R rear disc kits provide the ultimate Big Brake solution for popular muscle car rear axles that require a parking brake. FNSL4R four piston calipers, 13” or 14” two-piece rotors, and high performance BP-10 compound pads provide optimized and balanced braking to compliment front big brake upgrades on all types of custom, show and high performance street machines. The neatly hidden internal shoe system provides a clean installation with superior static holding power for parking. Optional caliper finishes and rotor designs allow builders to personalize the style and performance for every application.
Wilwood Engineering designs and manufactures high-performance disc brake systems. Since the company’s inception in 1977 by Bill Wood, we have developed a substantial matrix of brake components and engineering techniques that allow us to quickly and reliably create brake systems for almost any application. Our core ability is the rapid development of custom engineered brake systems using a combination of off-the-shelf and custom components. In addition to designing and manufacturing brakes for all types of competitive motor sports, Wilwood also manufactures brake systems and components for agricultural equipment, industrial applications, utility vehicles, snowmobiles, quads, motorcycles and military vehicles.
With headquarters in Camarillo, California, Wilwood employs approximately 250 people. We have on-shelf stock of more than 300 different brake calipers, 200 rotor designs, 100 master cylinder designs and a wide assortment of brackets, fittings, valves and brake lines. Our off-shelf brake calipers range in size from tiny calipers used on go-carts and light duty industrial equipment, to heavy duty original equipment brakes for the U.S. military Humvee.
Wilwood's engineering department uses the latest computer-aided design and manufacturing techniques in conjunction with finite element analysis, dynamic test and cycle test equipment, to find high-performance and reliability solutions for the most difficult braking tasks. Our extensive inventory of proprietary on-the-shelf components allow us to provide cost-effective solutions for unique brake applications.
Wilwood is ISO 9000 compliant and has extensive experience maintaining quality levels of 100ppm or less for original equipment manufacturers.
| Download Name | File Size |
| ds1052.pdf | 717.69KB |
| Kit Summary | |
| Axle Offset | 2.50 |
| Caliper Type | 4 - Black Powder Coat |
| Min Wheel Diameter Req'd* | 17 |
| Mount Type | Radial |
| Rear End Axle | Big Ford New Style |
| Rotor Diameter | 12.88 |
| Kit Components & Specs / Rotors | |
| Bedded | No |
| Design Type | GT |
| Dynamically Balanced | Yes |
| Left Hand - Part No | 160-12962 |
| Material | Spec-37 Iron |
| Outside Diameter (in) | 12.88 |
| Right Hand - Part No | 160-12961 |
| Style | GT Slotted |
| Surface Finish | Plain |
| Type | GT 48 Curved Vane |
| Vane Count | 48 CV |
| Width (in) | 1.10 |
| Parts & Accessories / Caliper Parts | |
| Bleed Screw Kit | 220-0627 |
| Bridge Bolt Kit | 230-7710 |
| CrossOver O-Ring Kit | 130-10540 |
| O-ring Kit | 130-2579 |
| Replacement Piston 1 | 200-8439 |
| Replacement Piston 2 | 200-8439 |
| Wear Plate - Left Hand | 300-6596 |
| Wear Plate - Right Hand | 300-6595 |
| Kit Components & Specs / Rotor Hats | |
| Bolt Circle 1 | 5 X 4.50 |
| Bolt Circle 2 | 5 X 4.75 |
| Bolt Circle 3 | 5 X 5.00 |
| Finish Color | Black E-Coat |
| Hat - Part No | 170-13539 |
| Hat Offset Dimension (in) | 1.540 |
| Material | Aluminum |
| Stud Diameter - BC 1 | 0.520 |
| Stud Diameter - BC 2 | 0.520 |
| Stud Diameter - BC 3 | 0.520 |
| Type | Parking Brake Hat - Standard |
| Parts & Accessories / Hat | |
| Bolt Kit | 230-8008 |
| Kit Components & Specs / Calipers | |
| Brake Pad Area (In²) | 8.2 |
| Brake Pad Plate | 7416 |
| Brake Pad Volume (In³) | 3.8 |
| Finish Color | Black Powder Coat |
| Left Hand - Part No | 120-11782-BK |
| Mount Type | Radial |
| Pad Compound | BP-10 |
| Piston 1 Bore (in) | 1.12 |
| Piston 2 Bore (in) | 1.12 |
| Piston Area (In²) | 1.98 |
| Piston Count | 4 |
| Piston Type | Stainless |
| Right Hand - Part No | 120-11782-BK |
| Type | Forged Narrow Superlite 4R |
| Parts & Accessories / Brake Lines | |
| Parking Brake Cable | 330-9371 |
