OEM Tools Double Flaring Tool & Brake Line Kit (24364)
Our 24364 double flaring tool kit delivers professional results for brake line installations and repairs. This complete system includes precision adapters for creating bubble-free, leak-proof double flares on 3/16" and 1/4" brake lines.
We designed this kit for technicians who need reliable flaring results without investing in bulky bench-mounted equipment. The compact yoke body fits easily in standard toolboxes while the hardened steel components handle daily shop use. Whether you're replacing corroded brake lines or fabricating custom hard lines for restoration projects, our 24364 provides the accuracy professional work demands.
- Creates SAE double flares on 3/16" and 1/4" brake tubing
- Includes adapters for both standard and bubble flare configurations
- Hardened steel yoke and forming cone for durability
- Four-piece adapter set fits common domestic and import applications
- Precision-machined dies ensure uniform flare dimensions
Tool Construction & Component Quality
The OEM automotive tools inline flaring tools 24364 features a machined steel yoke that resists flexing during the forming process. We use hardened steel for the forming cone and adapters because brake line work demands tools that maintain their geometry through hundreds of flares.
The kit includes four precision adapters sized for the most common brake line applications in passenger vehicles and light trucks. Each adapter seats firmly in the yoke base to prevent misalignment during the flaring operation. The included tubing cutter features a cutting wheel designed specifically for brake line materials, creating clean cuts without collapsing the tube wall.
Creating Professional Double Flares
Double flaring requires two forming operations to create the mushroom-shaped end that seals against brake fittings. We include detailed instructions with the 24364, but the basic process follows industry-standard technique used across automotive service tools for hydraulic system work.
First, select the correct adapter for your tubing diameter and insert the cut brake line to the depth marked on the adapter body. The initial forming operation uses the adapter’s built-in mandrel to fold the tubing end inward. Remove the adapter, flip it to expose the forming cavity, then complete the second operation that shapes the final double flare profile.
###Brake System Integration###
This flaring kit pairs naturally with other brake service equipment in your shop. Many technicians keep it alongside an OEM Tools brake bleeder for complete hydraulic system service capability.
When replacing brake lines, proper flaring technique prevents air infiltration during bleeding operations. The double flare profile creates metal-to-metal contact with the fitting seat before the threaded connection tightens. This geometry stops fluid leaks and prevents air from entering the system through microscopic gaps.
Complete Your Brake Service Setup
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Common Questions About the OEM Tools 24364 Flaring Kit
The 24364 kit includes adapters for 3/16-inch and 1/4-inch brake tubing, which covers the vast majority of passenger vehicle and light truck applications. These are the two standard sizes used in domestic and import brake systems. The kit handles both copper and steel brake line materials in these diameters.
If you work on heavy trucks or specialty vehicles requiring larger diameter brake lines, you'll need a different adapter set. For standard automotive brake service, these two sizes handle virtually all common applications.
Yes, the 24364 works excellently with copper-nickel alloy tubing, which has become the standard for brake line replacement in modern vehicles. Copper-nickel resists corrosion better than traditional steel brake lines while remaining easier to flare than stainless steel.
The tool's progressive forming cone applies pressure gradually, which is particularly important when working with copper-nickel. This material work-hardens if forced too quickly during the flaring process. Use quarter-turn increments on the feed screw and you'll create perfect flares every time.
A properly formed double flare has a mushroom-shaped profile with uniform wall thickness around the entire circumference. The flare diameter should match the fitting seat dimensions, and the surface should be smooth without cracks or splits.
Visually inspect the flare from multiple angles before installation. The formed edge should show consistent metal flow with no thin spots or tears. When you test-fit the flare into the brake fitting, it should seat firmly without excessive force. If the flare spins freely in the fitting or shows gaps, remake it before installing the brake line.
Double flares create a folded edge that seals against a cone-shaped fitting seat, common in domestic vehicles and many Asian imports. Bubble flares (also called ISO or DIN flares) form a rounded, convex shape that seals against a flat fitting surface, typically found in European vehicles.
The OEM Tools 24364 includes adapters for creating both flare types. Check your vehicle's service manual or inspect the existing brake fittings to determine which style you need. Using the wrong flare type results in leaks because the seal geometry won't match the fitting design.
For new copper or copper-nickel tubing purchased specifically for brake line work, annealing isn't necessary before flaring. This material comes pre-annealed from the manufacturer and flares easily in its as-shipped condition.
If you're attempting to reflare an existing brake line or working with work-hardened tubing, annealing helps prevent splitting. Heat the tubing end to cherry red with a torch, then let it cool naturally. Clean off any scale before flaring. Most brake line replacement work uses new tubing that doesn't require this step.
While the 24364 can technically form flares on stainless steel brake tubing, we don't recommend it for regular use with this material. Stainless steel requires significantly more pressure during the forming process, which can damage the tool's components over time.
Stainless brake lines are primarily used in racing applications and custom builds where corrosion resistance justifies the installation difficulty. If you regularly work with stainless steel brake lines, consider a heavy-duty hydraulic flaring tool designed specifically for harder materials. For standard automotive copper-nickel and steel brake line work, the 24364 provides excellent service life.
The included cutter blade lifespan depends on how much brake line work you perform and the tubing materials you cut. For occasional use cutting copper-nickel brake lines, the factory blade typically lasts through dozens of cuts before requiring replacement.
You'll notice the blade dulling when it starts crushing the tubing instead of making clean cuts. Replace the blade when you see tubing deformation or need multiple rotations to complete a cut. Replacement blades are inexpensive and widely available at automotive tool suppliers. Keeping a sharp blade ensures clean tube preparation, which is essential for quality flares.