Mercedes Mullins
Flaring is a crucial process in automotive engineering, particularly when it comes to brake and fuel lines. The process involves shaping the end of a tube with precision to ensure a tight seal and secure connection. This is essential to prevent leaks and maintain the integrity of the braking and fuel systems. Flaring tools are used to create these precise shapes, with various types available, including manual, hydraulic, and on-car tools, each offering advantages depending on the specific application and the user's preferences. The process of flaring, along with bending, is an art that requires practice and the right tools to ensure a perfect fit for the unique specifications of each vehicle.
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What You'll Learn
Flaring tools for brake and fuel lines
Flaring tools are essential for creating the perfect flares in brake and fuel lines. Flares are crucial for ensuring solid connections without any leaks in brake, transmission cooler, and fuel lines.
There are different types of flares, such as the 37-degree flare and the 45-degree inverted flare. The 37-degree flare is a single flare process that requires a tube sleeve for support and is secured with a female threaded tube nut. On the other hand, the 45-degree inverted flare is a double-walled flare created in a two-step process and is the most common style used in automotive hard lines.
When choosing a flaring tool, it is important to consider factors such as ease of use, stability, and compatibility with different line sizes and materials. Some popular options include the Eastwood Professional Brake Line and Tubing Flaring Tool, which offers three kinds of flares in five sizes of tubing, and the 4Lifetimelines Universal Hydraulic Flaring Tool, which is simple enough for DIY enthusiasts to handle themselves.
Additionally, it is worth investing in quality tools to ensure proper flaring and avoid leaks. Reviews and quality control are important considerations when choosing a flaring tool. It is also recommended to use a tubing cutter with rollers and a round blade to get a straight, clean cut before flaring.
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The process of flaring
Flaring is the last step in building a custom line for a fluid transfer project. It is a forming process that shapes the end of a tube precisely and uniformly to interface with the tube nuts and fittings. This process is done to ensure that the brake lines attach snugly to the brake system assemblies in a vehicle.
After the line is bent to the desired shape, the ends of the line can be flared. This is done using a flaring tool, such as a hydraulic brake line flaring tool or a mechanical flaring tool. The type of flare that is created depends on the brake line fittings found in the vehicle's hydraulic system. The most common type of flare used in automotive hard lines is the 45-degree inverted flare, which is an SAE (Society of Automotive Engineers) standard. This type of flare has a double-walled flare seat and does not require a tube sleeve or any sort of flare seat support due to the extra wall thickness.
To create a 45-degree inverted flare, the end of the metal line is first flared wider, and then folded back in on itself to create a stronger flare for high-pressure applications. When done correctly, this concave flare forms a perfect 45-degree angle and seals against a corresponding convex seat. For brake lines, a double flare is required to contain the extreme pressures that exist in a hydraulic braking system. It is important to note that single flares are not durable enough for steel brake lines. Additionally, it is suggested to use a lubricant at the flaring head and line end to make the process smoother. For brake lines, brake fluid can be used as a lubricant.
Overall, the process of flaring requires the correct tools and a bit of practice to get the bending and flaring process down.
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The importance of a good flare
Flaring is an important step in the process of creating custom fluid transfer lines for vehicles, and it requires precision and attention to detail. A good flare ensures a tight seal, preventing leaks and maintaining the integrity of the braking and fuel systems, which are crucial for safety. Here are some key points highlighting the importance of a good flare:
The Purpose of Flaring:
Flaring is the process of shaping the ends of tubes or lines to create a wider, angled mouth. This process is essential for connecting brake and fuel lines securely. A good flare ensures a tight and secure connection, preventing leaks and maintaining the necessary pressure in the lines.
Safety and Performance:
The braking and fuel systems in a vehicle are critical for safety and performance. A well-executed flare ensures that these systems function optimally. Poorly formed flares can lead to leaks, reducing the efficiency of the braking system and potentially causing safety hazards. Therefore, it is crucial to invest in quality tools and take the time to flare lines accurately.
Types of Flares:
Understanding the different types of flares is essential for choosing the right one for your vehicle. The two most common types are the 45-degree inverted flare (SAE standard) and the 37-degree flare. The 45-degree flare is a double-walled design that provides a strong connection and is commonly used in stock components. The 37-degree flare, on the other hand, is a single flare process that requires a tube sleeve for support and is often used in custom applications.
Tools and Techniques:
Investing in quality tools, such as tubing cutters, tube benders, and flare tools, is essential for achieving a good flare. Using the correct tools can make the process easier and help ensure accuracy. Additionally, proper preparation, including measuring, cutting, and cleaning the lines, is crucial for a successful flare.
Practice and Precision:
Flaring requires practice and attention to detail. It is a skill that improves with experience, and it is important to take the time to learn the process properly. Practicing on spare pieces of brake line can help refine the technique before attempting critical flares on a vehicle.
In conclusion, a good flare is vital to the safe and efficient operation of a vehicle's braking and fuel systems. It ensures a tight seal, prevents leaks, and maintains the necessary pressure. By investing in quality tools, understanding the different types of flares, and practicing the technique, one can achieve a good flare and contribute to the overall reliability and safety of the vehicle.
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Different types of flares
Flaring is a common method used to connect brake and fuel lines. This process involves creating custom-length hard metal lines to transfer fluids like brake fluid, fuel, and transmission fluid.
There are several types of flares used for brake and fuel lines, each with its own unique characteristics and applications:
37-Degree Flare:
The 37-degree flare, also known as the "AN" flare, is a single flare process that originated from a joint effort between the US Army and Navy during World War II. This type of flare requires a tube sleeve to support the back of the flare, and it is secured using a female threaded tube nut.
45-Degree Inverted Flare (Double Inverted Flare):
The 45-degree inverted flare is a standard specified by the Society of Automotive Engineers (SAE). This flare features a two-step process, creating a double-walled flare seat. It utilizes an inverted flare fitting, often abbreviated as "IFF," and has external or male threads. Due to the extra wall thickness, this flare does not require a tube sleeve or flare seat support. The 45-degree inverted flare is commonly used in automotive hard lines, including brake, fuel, and transmission fluid transfer lines.
Bubble Flare:
The bubble flare, also known as the DIN/ISO (Deutsche Institut für Normung/International Organization for Standardization) bubble flare, is characterized by the end of the line being mushroomed out and partially folded back, resulting in a rounded end. Bubble flares are typically found on European, Asian, and modern American cars and trucks. They seat into a concave surface in the corresponding part they are connected to.
Hydraulic Type:
The hydraulic brake line flaring tool is commonly used by professionals and is ideal for those plumbing an entire car, including fuel, transmission, brake, and other lines. It is a handheld tool that incorporates a hydraulic piston and pump handle, providing more leverage in a compact package. While it is more expensive, often costing over $300, it is excellent for flaring lines already installed on the car, and it does not require a bench vise.
On-Car Type:
The on-car type of flaring tool is less common but designed for working in tight spaces under a car. These tools are more compact and often more affordable than high-quality wingnut-type tools. They work on a single diameter of the brake line and provide enough leverage to be used without a bench vise.
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Flaring and forming copper-nickel brake lines
Flaring is a process that shapes the end of a tube to interface with the tube nuts and fittings. This process is done to ensure that the brake lines attach snugly to the brake system assemblies in your vehicle. The type of flare you fabricate depends on the brake line fittings found in a given vehicle's hydraulic system.
Copper-nickel brake lines are ideal for replacement as they are flexible and can be bent by hand to work around obstacles, including firewalls. They are also superior to steel in terms of reliability and are rust-proof. Copper-nickel brake lines require considerably less force to form a leak-proof seal than steel or stainless steel.
When flaring copper-nickel brake lines, it is important to start with a precisely measured length of the factory line. About 1/2 inch should be added on either end to accommodate the flare. Before flaring, place tube nuts matching the fittings on the brake assemblies over the line, with the threads facing outward toward the flare. After the tube nuts are on the line, a flaring tool of choice can be used to press the tool's 3/16" punch, which is then switched out for the 45-degree 3/16" punch and pressed again to form a double flare.
There are various tools available for flaring, including the hydraulic type, which is used by professionals, and the on-car type, which is more compact and designed for working in limited spaces. It is important to invest in a good-quality tool to ensure proper flaring and avoid leaks.
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Frequently asked questions
Flaring is a forming process that shapes the end of a tube precisely and uniformly to interface with the tube nuts and fittings. It ensures that the brake and fuel lines connect solidly without any leaks.
Some tools used for flaring brake and fuel lines include the 4LifetimeLines Universal Hydraulic Flaring Tool, the Eastwood Professional Brake Line and Tubing Flaring Tool, and the Mastercool.
It is important to start with a perfectly uniform, square end on the hard line. The tubing should be cut with a tubing cutter with rollers and a round blade. The outside of the tube should be cleaned with a wire brush, fine sandpaper, or Scotch-Brite.
