The AP Racing Radi-CAL brake system is specifically designed for BMW G80 M3 and G82 M4 models. This groundbreaking brake caliper innovation introduces a revolutionary asymmetrical design, utilizing advanced Computer Aided Design (CAD) and Finite Element Analysis (FEA) techniques. The result is visually stunning calipers with a unique, organic appearance, breaking away from traditional designs.
Since its debut in 2007, the Radi-CAL system has dominated professional motorsport, achieving numerous victories across various competitions. By redefining performance expectations, these calipers have consistently proven their superiority.
The Radi-CAL design offers several distinct advantages that differentiate it from conventional calipers. Notably, it delivers a significant increase in stiffness, boasting over 30% higher static and dynamic stiffness compared to traditional calipers. This enhanced rigidity minimizes deflection under load, resulting in exceptional pedal feel and modulation, as well as promoting even pad wear and extending caliper lifespan.
In addition to improved stiffness, the Radi-CAL system achieves substantial weight reduction. By eliminating unnecessary caliper mass, these calipers become lighter while maintaining increased stiffness. This reduction in unsprung weight contributes to enhanced vehicle handling and overall performance.
Optimized airflow is another notable feature of the Radi-CAL design. The caliper's shape allows for efficient air movement around and through the caliper, facilitating superior heat evacuation and cooling. This efficient airflow management ensures consistent brake performance, even in demanding conditions.
The Radi-CAL system also excels in efficient packaging. The asymmetric caliper profile and internal fluid porting enable the caliper to fit into tight spaces without compromising performance or functionality. This versatility in packaging ensures compatibility with various vehicle models: the BMW G80 M3 and G82 M4, including Competition models.
Discover the forefront of brake caliper technology with the AP Racing Radi-CAL system. With its exceptional stiffness, weight reduction, optimized airflow, and efficient packaging, these calipers redefine the limits of performance and reliability. Elevate your driving experience and unlock a new level of braking precision with the AP Racing Radi-CAL brake system.
Kit Contents:
- One pair of AP Racing Radi-CAL Pro5000R calipers
- One pair of AP Racing J Hook racing discs, featuring fully floating 6061 hard anodized aluminum hats and attachment hardware
- One pair of caliper mounting brackets and hardware
- One pair of Spiegler Stainless Steel Brake Lines with abrasion-resistant coating
- Detailed installation instructions
- Brake pads are NOT included.
- Pad Tension Clips (frequently referred to as anti-rattle clips) are NOT included.
Please note that the images provided are for representational purposes only, and the actual product may vary.
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The conventional painted finish of aftermarket calipers often presents a noticeable weakness. Typically available in red, black, or gold, these painted finishes aim to enhance aesthetics and provide some protection against corrosion in harsh winter conditions. However, when subjected to track environments, painted calipers are prone to chipping, flaking, fading, color shift, and general degradation within a relatively short period of time. Even some OEM calipers can turn an unsightly shade of brown after just a single weekend. While some dedicated enthusiasts may view these signs of wear as a mark of distinction, the reality is that the appearance suffers. Additionally, the paint particles can end up in unwanted places, as we will explain shortly.
The primary cause of these issues is heat. Traditional paint and powder coat finishes are unable to withstand the extreme temperatures experienced on the track. Powder coat finishes, in particular, are known to shrink. As the caliper heats up, the powder coat layer expands and grows. However, during the cooling process, the powder coat does not necessarily shrink in proportion to the caliper body. Consequently, the finish becomes loose, ultimately cracking and deteriorating.
Paint finishes can also encounter similar problems depending on the application process. If you were to compare aftermarket calipers from the same manufacturer, you would likely observe slight variations in the painted finish. Some calipers may have a thicker coat, while others may have a thinner coat, resulting in slightly different shades of color. Painting is, to some extent, an art form that requires a tightly controlled environment. Any deviation from these controlled conditions can lead to variation. A thick coat may give the appearance of softness around the edges and is prone to cracking, similar to powder coat. Conversely, insufficient paint coverage can create an uneven look and offer inadequate protection for the underlying aluminum. Furthermore, both paint and powder coat finishes can undergo significant color shifts when exposed to heat. Red may transform into maroon or black, gold may turn brown, and black finishes may lose their visual appeal.
In contrast, the calipers used in the AP Racing Radi-CAL Competition Kits feature an Electroless Nickel Plated (ENP) finish, eliminating the issues associated with painted calipers. ENP offers exceptional hardness and resistance to wear and corrosion. It is widely employed in various applications, ranging from the manufacturing of hard disc drives to the construction of targeting pods for the F-15 Eagle fighter jet. ENP is particularly well-suited for calipers that require frequent bleeding, as it does not chip or flake like painted calipers when accidentally bumped with a wrench. Moreover, the thin and uniform application of ENP can accommodate the intricate curves and pockets of complex caliper designs, such as the AP Radi-CAL. The extremely low porosity of ENP makes it highly suitable for components exposed to harsh chemicals like brake fluid. If fluid, dirt, or debris come into contact with the calipers, ENP is remarkably easy to clean, quickly restoring its lustrous appearance. Finally, ENP provides a distinctive liquid metal-like finish, enhancing the visual appeal of your brake system. Its neutral yet eye-catching appearance blends seamlessly with any color scheme, capturing and reflecting light in a captivating manner.
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