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The sealing surface for the brake fitting is created by flaring the ends of the line. There are two ways to accomplish this task, using either a single flare or a double flare in general.

Single Flare

In older, low-pressure braking systems, single flares were common. The single flare brake line is formed by pressing the tubing against a flaring tool, creating a flare, typically at a 45-degree angle at the tubing’s end. It’s a method commonly used in low-pressure braking systems, often seen in older vehicles. The process is simple, efficient, and suitable for systems where high pressure isn’t a significant factor.

single flare fitting
single flare fitting

Creating a Single Flare

To create a single flare:

  1. Cut the tubing to the desired length, ensuring a square cut.
  2. Remove all burrs.
  3. Slide the nut on the tube, ensuring the threaded end of the nut faces outwards.
  4. Create a 45-degree flare at the end of the tube using a flaring tool.
  5. Measure the flare diameter and check for excessive thin out.
  6. Lubricate the threads and assemble the fitting body.
  7. Tighten the assembly with a wrench until a solid feeling is encountered, then apply a one-sixth turn.

Understanding Double Flares

On the other hand, we have the double flare technique. Here, a small lip is first made at the end of the tubing, and then this lip is folded back upon itself to create a second flare. The two flares usually have angles around 45 and 37 degrees respectively. This method is typically used in high-pressure braking systems, like those in modern cars.

double flare
double flare

Advantages of Double Flare

Double flares provide a stronger and more dependable seal than single flares, crucial for high-pressure brake systems. Additionally, double flare brake lines are less likely to crack or leak over time, enhancing the safety and reliability of the braking system.

Single Flare vs Double Flare

So how do single and double flares measure up against each other? Well, a double flare offers a stronger and more reliable seal compared to a single flare. This strength is crucial in high-pressure brake systems. Plus, double flare brake lines are less likely to crack or leak over time, enhancing the safety and reliability of the braking system.

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