Quick notes
- Double flaring is a crucial technique used to create a leak-free connection between the brake line and the brake fitting.
- Apply a small amount of brake fluid to the flares and insert the brake line into the brake fitting.
- If the brake line is too short, you will need to cut a new piece of brake line and make new flares.
Brake lines are essential components of a vehicle’s braking system. They transport brake fluid from the master cylinder to the wheel cylinders or calipers, enabling you to apply pressure to the brake pads and slow down the vehicle. Over time, brake lines can become damaged or corroded, necessitating replacement. Double flaring is a crucial technique used to create a leak-free connection between the brake line and the brake fitting. In this comprehensive guide, we will delve into the intricacies of how to make brake line double flares, empowering you to tackle this task with confidence.
Understanding Double Flaring
Double flaring is a process that involves creating two raised lips, or flares, at the end of a brake line. These flares provide a secure and leak-proof connection when the brake line is inserted into a brake fitting. The first flare, known as the primary flare, is created using a single flaring tool. The second flare, called the secondary flare, is formed by inverting the brake line and using a double flaring tool.
Tools and Materials Required
To make brake line double flares, you will need the following tools and materials:
- Brake line tubing
- Brake line cutter
- Single flaring tool
- Double flaring tool
- Flaring block
- Brake fluid
- Rags or paper towels
Step-by-Step Guide to Making Brake Line Double Flares
1. Cut the Brake Line
Measure and mark the desired length of the brake line. Use a brake line cutter to make a clean, perpendicular cut.
2. Deburr the End of the Brake Line
Use a deburring tool or a sharp knife to remove any burrs or sharp edges from the cut end of the brake line. This prevents leaks and ensures a proper seal.
3. Create the Primary Flare
Insert the brake line into the flaring block and secure it with the clamp. Position the single flaring tool over the brake line and tighten the screw until the primary flare is formed.
4. Inspect the Primary Flare
Ensure that the primary flare is even and symmetrical. It should have a 45-degree angle and be approximately 1/16-inch wide.
5. Create the Secondary Flare
Invert the brake line and insert it into the flaring block with the primary flare facing down. Position the double flaring tool over the brake line and tighten the screw until the secondary flare is formed.
6. Inspect the Secondary Flare
Inspect the secondary flare to ensure it is even and symmetrical. It should be slightly wider than the primary flare, approximately 3/16-inch wide.
7. Lubricate and Install
Apply a small amount of brake fluid to the flares and insert the brake line into the brake fitting. Hand-tighten the fitting and then use a wrench to tighten it further, following the manufacturer’s torque specifications.
Troubleshooting Common Issues
- Leaking flares: Ensure that the flares are even and symmetrical. Tighten the brake fitting further or use a new brake line fitting.
- Cracked flares: If the flares are cracked, cut off the damaged portion of the brake line and make new flares.
- Brake line too short: If the brake line is too short, you will need to cut a new piece of brake line and make new flares.
- Brake line too long: If the brake line is too long, you can trim it down using a brake line cutter.
Tips for Success
- Use high-quality brake line tubing and flaring tools.
- Practice on a scrap piece of brake line before attempting to flare the actual brake line.
- Keep the brake line clean and free of debris.
- Inspect the flares carefully before installing them.
- Tighten the brake fitting securely, but do not overtighten.
Recommendations: Enhancing Brake System Performance
Mastering the art of brake line double flaring empowers you to maintain and repair your vehicle’s braking system with confidence. By following the steps outlined in this guide, you can create leak-proof connections that ensure optimal brake performance and safety. Remember to practice caution, use the correct tools, and inspect your work thoroughly to achieve the best results.
Frequently Asked Questions
Q: What is the difference between a single flare and a double flare?
A: A single flare has one raised lip, while a double flare has two raised lips. Double flares are more secure and leak-proof than single flares.
Q: How often should I inspect my brake lines?
A: Brake lines should be inspected annually or more frequently if you drive in harsh conditions. Look for signs of corrosion, damage, or leaks.
Q: Can I use a double flaring tool to create a single flare?
A: Yes, you can use a double flaring tool to create a single flare by not inverting the brake line before forming the second flare.
Q: What type of brake fluid should I use?
A: Always use the type of brake fluid recommended by the vehicle manufacturer.
Q: Is it safe to drive with a cracked brake line flare?
A: No, it is not safe to drive with a cracked brake line flare. A cracked flare can lead to leaks and brake failure.
