Highlights
- Whether you’re installing a new brake system or repairing an existing one, knowing how to flare brake line properly is essential.
- Use a deburring tool or a file to remove any burrs or sharp edges from the inside of the flare.
- Deburr the flare properly and make sure the flare is fully seated in the fitting.
Flaring brake lines is a crucial skill for any automotive enthusiast or professional mechanic. Whether you’re installing a new brake system or repairing an existing one, knowing how to flare brake line properly is essential. This guide will provide you with step-by-step instructions, tips, and troubleshooting advice to help you achieve perfect flares every time.
1. Gather Your Tools
Before you start, gather the following tools:
- Brake line flaring tool
- Brake line
- Flaring block
- Brake fluid
- Rags
2. Choose the Correct Flare Type
There are two main types of brake line flares: single-flare and double-flare. Single-flare is typically used for rigid brake lines, while double-flare is used for flexible brake lines. Make sure you choose the correct flare type for your application.
3. Prepare the Brake Line
Cut the brake line to the desired length and remove any burrs or sharp edges. Use a tubing cutter or a hacksaw to ensure a clean cut.
4. Insert the Brake Line into the Flaring Tool
Place the brake line into the flaring tool and tighten the chuck. Make sure the brake line is fully inserted and centered.
5. Insert the Flaring Block
Insert the flaring block into the flaring tool and tighten the knob. The flaring block should be positioned against the end of the brake line.
6. Flare the Brake Line
Apply pressure to the flaring tool and slowly rotate it around the brake line. Continue flaring until the flare is formed to the desired angle, usually 45 degrees.
7. Check the Flare
Remove the brake line from the flaring tool and inspect the flare. It should be smooth, uniform, and free of cracks or imperfections.
8. Deburr the Flare
Use a deburring tool or a file to remove any burrs or sharp edges from the inside of the flare. This will help prevent leaks and ensure a proper seal.
9. Install the Flare
Install the flared brake line into the brake system and tighten the fittings. Make sure the flare is fully seated and there are no leaks.
10. Bleed the Brake System
Once the brake line is installed, bleed the brake system to remove any air from the lines. This will ensure proper brake performance.
Troubleshooting Tips
- Flare is not smooth or uniform: Check the flaring tool and flaring block for any damage or wear. Make sure the brake line is fully inserted and centered in the flaring tool.
- Flare is cracked or imperfect: Reduce the pressure applied to the flaring tool or try using a different flaring block.
- Flare is not at the correct angle: Adjust the angle of the flaring tool to achieve the desired flare angle.
- Flare leaks: Deburr the flare properly and make sure the flare is fully seated in the fitting.
Wrapping Up
Flaring brake lines properly requires patience, precision, and the right tools. By following the steps outlined in this guide, you can achieve perfect flares and ensure a safe and reliable brake system. Remember to always wear safety glasses and gloves when working with brake lines.