Product Overview
Elevate your vehicle’s stopping power to professional levels with the Wilwood Forged Narrow Superlite 6R Big Brake Kit (140-15945). This comprehensive front brake system is engineered for high-performance drivers who demand superior braking force, exceptional heat management, and consistent pedal feel on the track, autocross course, or aggressive street driving. The kit’s core strength lies in its forged narrow “6R” profile calipers, which provide massive 6-piston clamping power while minimizing weight and clearing a wider range of factory and aftermarket wheels.
The heart of this system is the pair of forged aluminum Superlite 6R calipers. Unlike cast calipers, the forging process aligns the aluminum’s grain structure, resulting in a stronger, more rigid caliper that resists flex under extreme pressure, giving you precise modulation and control. These are paired with massive 12.19″ (309.6mm) rotors featuring curved-vane technology for optimal cooling, drastically reducing brake fade during repeated hard stops. For help selecting the perfect pad, read our guide [Choosing the Right Brake Pad Compound for Your Driving Style].
This isn’t just an upgrade; it’s a complete transformation of your front braking system. Designed as a direct, bolt-on solution for specific vehicle applications, this kit includes everything needed for installation. Whether you’re pushing lap times or want absolute confidence on a canyon run, this system provides the thermal capacity and stopping power that stock brakes simply cannot match. Learn more about the engineering in our article [The Advantages of Forged vs. Cast Brake Calipers].
Technical Specifications
| Specification | Details |
|---|---|
| Kit Part Number | 140-15945 |
| Caliper Model | Forged Narrow Superlite 6R |
| Caliper Pistons | 6-Piston (Differential Bore) |
| Caliper Material | Forged Aluminum |
| Rotor Diameter | 12.19″ (309.6 mm) |
| Rotor Type | Directional Vane, Slotted (2-Piece Optional) |
| Rotor Thickness | 0.81″ (20.6 mm) |
| Rotor Material | Iron Alloy (AeroRotors Available) |
| Pad Compound | Wilwood Polymatrix Q (Included) |
| Hardware Included | Calipers, Rotors, Pads, Brackets, Hardware |
Comparison Table: Superlite 6R vs. OEM & Competitor Kits
| Feature | Wilwood Superlite 6R Kit | Typical OEM Performance Brakes | Competitor Big Brake Kit |
|---|---|---|---|
| Caliper Construction | Forged Aluminum | Cast Iron or Cast Aluminum | Typically Cast Aluminum |
| Piston Count | 6-Piston Differential Bore | 2-Piston or 4-Piston | 4-Piston or 6-Piston |
| Weight | Significantly Lighter | Heavy | Moderate |
| Rotor Size | 12.19″ (Large Thermal Mass) | 11-13″ (Varies) | 11.5-14″ (Varies) |
| Cooling | Excellent (Curved Vane Rotors) | Standard | Varies |
| Pad Selection | Extensive Wilwood & Aftermarket | Limited OEM Options | Brand Specific |
Frequently Asked Questions (FAQs)
Q1: Will this big brake kit fit inside my factory wheels?
The “Narrow” Superlite 6R profile is designed for maximum wheel clearance. However, fitment is dependent on your specific wheel’s inner barrel diameter and spoke design. Always check Wilwood’s specific fitment guide for your vehicle application or consult with our technical team for a definitive answer. You may also need to consider our [Wilwood Wheel Spacers] for perfect clearance.
Q2: What is the advantage of a differential bore piston design?
The six pistons are sized in a progression (e.g., smaller pistons at the leading edge, larger at the trailing edge). This optimizes pressure distribution across the brake pad, reducing taper wear and improving overall pad life and consistency.
Q3: Are these brakes suitable for daily driving?
Yes, when paired with the correct pad compound like the included Polymatrix Q, they are very streetable with low noise and dust. However, their true potential is realized during high-performance driving. For a more dedicated track setup, you would want to switch to a more aggressive pad like the [Wilwood BP-20 or BP-30 Track Pads].
Q4: What is required for a proper brake bleed with this kit?
A thorough brake bleed is critical. We recommend using a high-temperature, high-performance brake fluid like [Wilwood EXP 600 Plus Brake Fluid] and a pressure bleeder to ensure all air is purged from the system for a firm pedal.
Q5: Does this kit include a parking brake?
No, the Wilwood 140-15945 is a front brake kit only and does not incorporate a parking brake function. The parking brake remains with your stock rear brakes. For a complete stop, consider pairing it with a matching [Wilwood Rear Big Brake Kit].
Pros and Cons
| Pros | Cons |
|---|---|
| Massive Stopping Power & excellent modulation | Premium Price compared to stock replacement parts |
| Superior Heat Management reduces fade | Potential Wheel Fitment Issues must be verified |
| Lightweight Forged Calipers reduce unsprung weight | No Parking Brake (front kit only) |
| Wide Range of Pad Compounds available | Can be Overkill for purely street-driven vehicles |
| Consistent Pedal Feel under extreme conditions | Possible Rotor Warping if not bed-in properly |
| Bolt-On Installation for specified applications | Increased Dust vs. OEM, depending on pad compound |
Conclusion & Ideal Use Cases
The Wilwood Forged Narrow Superlite 6R Big Brake Kit (140-15945) is a top-tier solution for serious enthusiasts who have surpassed the limits of their factory braking system. It delivers race-proven performance, reliability, and durability in a package that is adaptable for everything from aggressive street use to full competition.
This brake kit is the ideal choice for:
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Track Day & HPDE Enthusiasts: Manages repeated high-speed braking.
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Autocross & Time Attack Competitors: Provides precise modulation and instant bite.
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High-Performance Street Cars: Offers ultimate safety margins and confidence.
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Muscle Cars & Sports Cars: Modernizes braking performance on classic and modern platforms.
For less aggressive driving or smaller budgets, consider the [Wilwood 4-Piston Powerlite Kit]. However, for those who need uncompromised performance and the thermal capacity to handle extreme abuse, the Superlite 6R kit is an exceptional investment in both speed and safety. For official specifications, torque values, and bed-in procedures, always refer to the Wilwood Engineering Installation Instructions (External Link).
Contact our performance braking experts today to confirm fitment for your vehicle, discuss pad compound options, and bundle your purchase with brake fluid and stainless lines for a complete upgrade.
