The unsurpassed braking capacity of the Forged Narrow Superlite 4R four-piston caliper serves as the basis of these 12.88” or 14.00” inch big rotor kits for the popular Ford Bronco vehicles. SL4R kits are engineered application specific to these vehicles, providing simplified installation. Each kit is engineered vehicle specific and utilizes the existing hub assembly. Big brake kits offer increased brake capacity and complimentary style with wheel, tire, and suspension upgrades. Optional caliper finishes and rotor designs simplify personalizing the style and braking requirements of any 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 |
| ds1023.pdf | 477.66KB |
| Make | Model | Years | Fitment Notes |
| Ford | Bronco | 1966 - 1973 | KIT,FRONT,FORD BRONCO,66-75,DANA 30/44 14.00,FNSL4R,DRUM SPINDLE,W/LINES; RTR:14.00-IN DIA, GT 72 CURVED VANE, SLOTTED; CLPR:FORGED NARROW SUPERLITE 4R, 4-PISTON, BLACK POWDER COAT with 11" Diameter Brake Drum with 3300 lb Axle with 10" Diameter Brake Drum with 2700 lb Axle |
| Ford | Bronco | 1974 - 1975 | KIT,FRONT,FORD BRONCO,66-75,DANA 30/44 14.00,FNSL4R,DRUM SPINDLE,W/LINES; RTR:14.00-IN DIA, GT 72 CURVED VANE, SLOTTED; CLPR:FORGED NARROW SUPERLITE 4R, 4-PISTON, BLACK POWDER COAT with 11" Diameter Brake Drum with 3300 lb Axle with 10" Diameter Brake Drum with 2900 lb Axle |
| Details | |
| Part Type | Disc Brake Caliper / Rotor / Pad Kit |
| Kit Components & Specs / Rotors | |
| Bedded | No |
| Design Type | GT |
| Dynamically Balanced | Yes |
| Left Hand - Part No | 160-8399 |
| Material | Spec-37 Iron |
| Outside Diameter (in) | 14.00 |
| Right Hand - Part No | 160-8398 |
| Style | GT Slotted |
| Surface Finish | Plain |
| Type | GT 72 Curved Vane |
| Vane Count | 72 CV |
| Width (in) | 1.25 |
| Parts & Accessories / Caliper Parts | |
| Bleed Screw Kit | 220-0627 |
| Bridge Bolt Kit | 230-7049 |
| CrossOver O-Ring Kit | 130-10540 |
| O-ring Kit | 130-2655 |
| Replacement Piston 1 | 200-7528 |
| Replacement Piston 2 | 200-7528 |
| Wear Plate - Left Hand | 300-6596 |
| Wear Plate - Right Hand | 300-6595 |
| Kit Components & Specs / Rotor Hats | |
| Bolt Circle 1 | 5 x 5.50 |
| Finish Color | Black E-Coat |
| Hat - Part No | 170-13314 |
| Hat Offset Dimension (in) | 1.000 |
| Material | Aluminum |
| Stud Diameter - BC 1 | 0.640 |
| Stud Diameter - BC 2 | 0.000 |
| Stud Diameter - BC 3 | 0.000 |
| Type | Big Brake Hat - Short Offset |
| 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 | 120-12501-BK |
| Mount Type | Radial |
| Pad Compound | BP-10 |
| Piston 1 Bore (in) | 1.75 |
| Piston 2 Bore (in) | 1.75 |
| Piston Area (In²) | 4.80 |
| Piston Count | 4 |
| Piston Type | Stainless |
| Right Hand - Part No | 120-12501-BK |
| Type | Forged Narrow Superlite 4R |
| (Increase / Decrease Track Width) | |
| Caliper Type | 4 - Black Powder Coat |
| Min Wheel Diameter Req'd* | 18 |
| Mount Type | Radial |
| Rotor Diameter | 14.00 |
| Spindle Type | Factory Drum Spindle |
| Parts & Accessories / Brake Lines | |
| Front Line Kit | 220-13319 |
| Kit Summary | |
| OE Hub Offset | +.00 |
