Key points
- Choose the appropriate die for the 37-degree flare and insert the brake line into the flaring tool.
- Remove the brake line from the flaring tool and insert it into the tool again, this time using the die for the 45-degree flare.
- Thread the fitting onto the flared end of the brake line and tighten it securely using a torque wrench.
When it comes to maintaining your vehicle’s braking system, understanding the importance of properly flared brake lines is crucial. Double flaring, in particular, plays a vital role in ensuring a secure and leak-free connection. This comprehensive guide will delve into the intricacies of how to double flare brake line, equipping you with the knowledge and skills necessary to tackle this essential automotive task.
Understanding Double Flaring
Double flaring is a technique used to create a reinforced, leak-proof connection between brake lines and fittings. It involves creating two distinct flares at the end of the brake line: a small, 37-degree flare followed by a larger, 45-degree flare. This double-layered approach provides superior strength and prevents the fitting from pulling off under pressure.
Essential Tools for the Job
To successfully double flare a brake line, you’ll need the following tools:
- Brake line flaring tool: This specialized tool features a die set that allows you to create both the 37-degree and 45-degree flares.
- Pipe cutter: Used to precisely cut the brake line to the desired length.
- Deburring tool: Removes sharp edges from the cut brake line, preventing damage to the flaring tool and ensuring a smooth flare.
- Torque wrench: Essential for tightening fittings to the manufacturer’s specifications.
- Safety glasses and gloves: Protect your eyes and hands from potential hazards.
Step-by-Step Guide to Double Flaring a Brake Line
1. Prepare the brake line: Cut the brake line to the desired length using a pipe cutter. Ensure a clean, square cut.
2. Deburr the cut end: Use a deburring tool to remove any sharp edges from the cut end of the brake line.
3. Insert the brake line into the flaring tool: Choose the appropriate die for the 37-degree flare and insert the brake line into the flaring tool.
4. Create the first flare: Tighten the flaring tool to create the initial 37-degree flare.
5. Remove the brake line and insert it again: Remove the brake line from the flaring tool and insert it into the tool again, this time using the die for the 45-degree flare.
6. Create the second flare: Tighten the flaring tool to create the second, 45-degree flare.
7. Inspect the flare: Ensure both flares are clean, smooth, and free of defects.
8. Connect the fitting: Thread the fitting onto the flared end of the brake line and tighten it securely using a torque wrench.
Tips for Successful Double Flaring
- Use the correct size die: Ensure the die size matches the brake line diameter.
- Apply even pressure: Avoid over-tightening the flaring tool, as it can damage the brake line.
- Clean the brake line thoroughly: Any dirt or debris can hinder the flaring process and compromise the connection.
- Practice on scrap brake line: Familiarize yourself with the process before working on your vehicle’s brake lines.
Double Flaring vs. Single Flaring
While single flaring is a simpler technique, it offers less strength and is prone to leaks. Double flaring, on the other hand, provides superior strength and leak resistance, making it the preferred method for brake lines.
When to Double Flare Brake Lines
Double flaring is recommended for all brake lines, particularly those under high pressure or subjected to extreme vibration. It is also essential for applications where a secure and leak-free connection is paramount.
Maintaining Your Double Flared Brake Lines
- Regularly inspect for leaks: Visually inspect your brake lines for any signs of leakage.
- Check for corrosion: Corrosion can weaken the brake lines and compromise their integrity.
- Replace damaged lines promptly: If you notice any damage or wear, replace the affected brake line immediately.
The Importance of Proper Brake Line Maintenance
Maintaining your vehicle’s brake lines is crucial for safe driving. Properly flared brake lines ensure a strong and leak-free connection, preventing brake fluid leaks and maintaining optimal braking performance.
Time to Take Charge of Your Brake Line Maintenance
By mastering the art of double flaring, you gain the ability to perform essential brake line maintenance yourself. This empowers you to ensure the safety and reliability of your vehicle’s braking system, providing peace of mind on the road.
Quick Answers to Your FAQs
Q: Can I use a single flaring tool for double flaring?
A: No, a single flaring tool can only create one flare. You’ll need a dedicated double flaring tool to create both the 37-degree and 45-degree flares.
Q: How often should I inspect my brake lines?
A: It’s recommended to inspect your brake lines at least once a year or more frequently if you drive in harsh conditions.
Q: Can I use a bench vise to hold the brake line while flaring?
A: While a bench vise can be used, it’s essential to ensure the brake line is securely clamped to prevent movement during flaring.
Q: What happens if I don’t double flare my brake lines?
A: Single-flared brake lines are more susceptible to leaks and may not withstand the pressure required for optimal braking performance.
Q: How do I know if my brake line is damaged?
A: Signs of damage include corrosion, dents, cracks, or any visible leaks.