How To Make A Double Flare-Here’s A Complete Guide

Knowing how to make a double flare supports you in preventing your vehicle from the bad friction wear fretting along with cracks at the flares causing leaks in the lines.

It also helps you protect your engine better.

However, creating a double flare can be complicated if you don’t know its specific steps. You also don’t know what you should prepare for making this tool.

Don’t worry, we will give you all the useful information in this article.

Keep reading for details and the ultimate guide on making a double flare.

What Is A Double Flare?

How To Make A Double Flare

The double flare is the most common dual type of flare in the industry, especially among American and Asian automobiles.

It can also be an Inverted flare or SAE. This tool can fit multiple automotive makes and models.

A double flare enters the car’s braking system twice. It should allow the shaped single flare lip to remain folded on the system.

Despite being alike, a double flare is much stronger than a single flare and can withstand the braking system’s pressure.

How To Make A Double Flare? A Full Guide

Do You Have to Flare Brake Lines

Do you want to know how to do a double flare without hassle? The complete guide below will give you detailed steps to help you make this tool quickly and easily.

Cut The Line

The first step is cutting the double flared brake line to get a smooth and clean line.

You must cut the tubing using a tube cutter to the required length.

The tubing cutters operate best with the tightened blade after each pass. Just crank down the cutter wheel cylinders without loading the brake line into this tubing cutter.

Discard burrs from the tubing’s cut surface. Next, slide the flare nut onto the tube with the hexagonal end first.

Using the old brake lines as the instruction, trim each line beforehand to see how much additional tubing you have, or you’ll need to buy one if you are short.

Put the Fitting onto the Brake Line

The second step of “double flare how to” is to put the fitting on the brake line before flaring it. After loosening the wing-nut clamps, insert the fitting into the proper gap in the tubing clamp.

Place the fitting upside down next to the tube’s protruding end. Let the end protrude from the fitting to accommodate its thickness.

Tighten the wing brake nuts and hold the tool halves parallel to each other while tightening.

Adjust the fitting height to match your flare height. Allow the fitting to reach the bottom part because that’s the flare height.

Place an anvil next to your fitting, loosen the clamp, and raise the fitting to the same height as the anvil’s shoulder.  The anvil should be the same size as the fitting you are using.

Insert Brake Line On The Flare Bar

Inserting the brake line into the flaring bar is the third step in the guide on how to double flare.

You notice that the concave area on one side of the flaring bar where threading starts is relative to the flat back. Insert the brake line over the bar, so the flared end comes out of the open thread.

Continue installing the anvil on the brake line. Turn the anvil upside down and thread the bar top through the correct size hole in the tube. Let it comfortably be in the tube.

Put an Adaptor next to the Brake Line

After completing the third step, continue the fourth step in learning how to double flare a brake line. Like when you choose the brake bleeder hose size, knowing the compatible size of this tool is essential.

Put an adapter with the proper size (¼-inch and 3/16-inch types are the most popular) on the flaring bar and thread the baking line, so it is level with the adapter’s lower lip.

It is better to place the brake line above the lips a little if you don’t want it to drop under the lip height.

Then, turn the adapter upside down, cover it with the brake fluid, and install it on the tube. Double-check the alignment of the adaptor lip and brake line.

Tighten The Flare

Tighten the flaring cone, making the anvil flush with its base by boring into it. Turn it until the anvil bottom sits properly on the flat and firm anvil base.

Put the flare on the tube clamp, ensuring to lock the screw point in the adapter center and the flare on the tube clamp bar.

Tighten the screws by turning it clockwise on the flaring bar until the adapter bottom is out of the tube clamp.

Then, unscrew the flare and remove it from the anvil. This produces your first flare.

Don’t use strong force here to avoid damaging the flare. Try to do this step slowly with the proper force.

Insert the Yoke Press Tool into the Adaptor

Slide the yoke presser over the adapter and ensure the adapter is flat, straight, and not falling to the side or in a twisted position.

Grasp the yoke, an E-shaped flaring tool with an adjustable central conical point, and attach it to the flared base.

Install it loosely, and you can move it around without difficulty. Tighten the yoke presser so that the adaptor bottoms are out and touch the flaring bar.

This is one of the indispensable steps when you learn how to do a double flare on brake line. 

Remove The Adaptor

Remove the adaptor from the presser and brake line. After taking out this brake tool, inspect the tubing end.

The flare needs to be even all around without gaps or cracks. Remove the tubing from the clamp, also.

This step is easy and simple to do.


Do You Have to Flare Brake Lines?

Yes, you have to. Double flares are essential for brake lines because of the high pressures inflicted on them through the hydraulic system.

Unlike single flared lines, double flare can be appropriate for higher-pressure lines with no leaking or cracking.

The brake system can not afford to leak into the lines since this can cause serious failure or injury for the brakes.

What Does Single Flare Differ From Double Flare Brake Lines?

You can find several differences between single-flared and double-flared lines in your vehicle’s braking system.

For single flared lines, you never find them in the automotive brake system unless you have repaired the braking system but not placed them back together properly.

The alloy steel brake pedal lines don’t use these single-flared fittings. Yet, you may see single flared lines in an automotive design somewhere.

You can frequently see double-flared lines in Asian and American automotive models.

These double flared fittings can help you manage friction wear and crack at the flare sight leading to a leak in the line.

In summary, your vehicle never has single-flared lines because they are a significant hazard in a vehicle’s braking system.

And the most common type of flaring fittings is double-flared lines, which you can look for in most vehicles.

Why Do You Need a Brake Flaring Tool‌?

It’s because this tool plays an important role in protecting and repairing brake lines. It allows you to repair your car without removing its brake line.

‌Thus, a brake line tool will help you save money and time. It is easy to fix your vehicle yourself instead of taking it to an auto shop for expensive replacement.

Don’t worry when you don’t know about using it to repair your automobile because this tool is simple to operate. You can use it for most vehicle designs even with the most complex ones.

How To Use a Double Flaring Tool?

‌First, you must gather the right materials for the best effectiveness, including double flaring lines and tools.

A double flare brake line is easy to look for, so choose and use suitable flaring tools to ensure accuracy and consistency.

Before purchasing the double flare line, you must check the quality and size of your car. Then, you measure and cut the tube to comply with the required length on the line.

Remove any burrs to get the smoothest tubing edges, and slide the fittings onto the tube. The final step is to set up the tubing to prepare for using the double-flare tool to complete your auto repairs.


How To Make A Double Flare-Here's A Complete Guide

The above guide has helped you learn how to make a double flare for your vehicle repairs with ease.

This process is simple to do if you follow our instructions. There is no doubt that a brake line flare tool is an indispensable component in the automotive tool kit.

It assists you in fixing your brake line and doing heavy-duty DIY.

Specifically, the flaring process of a brake line requires a capable and consistent double flaring tool with high durability.

You need to check your vehicle and use the proper double flare tool to repair the faulty brake line to improve your car’s performance and operation.

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