Best Double Flare Tool for Brake-Line Repairs

#1 · Best Overall

1. Capri Tools 3/16 in. Double Flaring Tool

• Weight: 12.8 oz

Best for: Compact in-place 3/16-inch repairs.

Why it ranks #1: It makes 45-degree SAE double flares on 3/16-inch non-stainless steel, nickel, and copper tubing, with a compact design for tight on-vehicle work.

The Capri Tools CP21110-316 makes 45-degree SAE double flares on 3/16-inch tubing, with a compact form that supports work both on and off the vehicle. Its detachable die also lets you move the job to a bench vise, giving brake-line repairers options when access or working position changes.

Compatibility with non-stainless steel, nickel, and copper tubing covers several stated materials for 3/16-inch brake-line work. The compact body helps reach tight on-vehicle spaces, while the detachable die supports bench-vise use when you can remove the line or prefer a stable work surface. Setup uses two 10 mm locking screws and a positioning bolt, so the supplied procedure provides a defined way to secure tubing at the correct position before forming the flare.

Skip it if you need a tool for several tube diameters; the Lisle 33260 handles both 3/16-inch and 1/4-inch tubing.

Choose it for 3/16-inch brake-line repairs where compact access and the option of bench-vise work matter. Its stated tubing range excludes stainless steel, and it does not cover other diameters.

Listed on Amazon as: Capri Tools 3/16 in. Double Flaring Tool (CP21110-316)

#2 · On-Vehicle Pick

2. Titan 51535 Double Flaring Tool

• Weight: 14.2 oz

Best for: In-place 3/16-inch brake-line work.

Why it ranks #2: This compact tool creates inverted 45-degree SAE double flares on 3/16-inch steel and nickel-copper tubing and can be used on the vehicle.

Titan’s 51535 creates an inverted 45-degree SAE double flare on 3/16-inch steel or nickel-copper tubing, and its compact shape supports repairs in tight under-car spaces. The removable handle adds another practical adjustment for mechanics working around restricted access or changing how they position the tool.

The included positioning bolt and double-ended OP1/OP2 punch provide the named components for locating and forming the flare, while Grand 66A die lubricant is included for the job. Its compact construction is specifically suited to on-vehicle brake-line repair, avoiding the need to remove a line just to reach a bench. The removable handle can help adapt the tool’s working arrangement, but the maker does not recommend it for stainless steel tubing.

Skip it if you need to flare stainless steel; the DPTOOL kit lists 304 stainless steel among its compatible materials.

A practical fit for brake-line mechanics handling 3/16-inch steel or nickel-copper tubing in confined vehicle locations. Keep its stainless-steel restriction and single listed tube size in mind before choosing it.

Listed on Amazon as: Titan 51535 3/16-Inch Double Flaring Tool

#3 · 1/4-Inch Pick

3. Capri Tools 1/4 in. Double Flaring Tool

• Weight: 6.4 oz

Best for: Compact 1/4-inch in-place flaring.

Why it ranks #3: It targets 1/4-inch tubing and makes 45-degree SAE double flares; its compact design supports tight-space and on-vehicle work.

The Capri Tools 1/4-inch double flaring tool forms 45-degree SAE flares on non-stainless steel, nickel, and copper tubing. Its compact design supports work both on and off the vehicle, giving brake-line repairers a small tool for tight access as well as bench-vise jobs.

The dedicated 1/4-inch size suits jobs using that tubing diameter, while stated compatibility with non-stainless steel, nickel, and copper covers several common line materials. Its compact body is intended for tight on-vehicle access, and the detachable die allows use with a bench vise when the work is easier off the vehicle. Setup uses two 10 mm locking screws and a positioning bolt, providing a defined way to secure and position tubing before forming the flare.

Skip it if you need one tool for 3/16-inch and 1/4-inch lines; the Lisle 33260 covers both sizes.

Choose it for 1/4-inch brake-line work where compact access and a detachable die suit the workflow. Its stated scope excludes stainless steel and does not cover other tubing diameters.

Listed on Amazon as: Capri Tools 1/4 in. Double Flaring Tool

#4 · Two-Size Kit

4. Lisle 33260 Double Flaring Tool Kit

• Weight: 1.8 lb

Best for: Tight-space 3/16 and 1/4 lines.

Why it ranks #4: It makes single or double flares on both 3/16-inch and 1/4-inch tubing, with a low-profile design and depth stop.

Lisle’s low-profile 33260 works on 3/16-inch and 1/4-inch tubing, with a compact shape intended to flare lines in tight spaces. Its vise assembly holds tubing centered without marring, pairing restricted-access use with a stated way to keep the line positioned during forming.

The kit creates single or double flares across two common listed diameters, 3/16-inch and 1/4-inch, making it useful when a repair involves either size. A depth stop helps set tubing length, while the vise assembly holds the tube centered without marring; together, those features support repeatable positioning through the flare process. The included case, forming dies, grease, depth plug, and internal deburring tool provide named pieces for setup and line preparation, but the tool does not work on stainless tubing.

Skip it if you need stainless-steel compatibility; the DPTOOL kit lists 304 stainless steel among its supported materials.

A sensible fit for 3/16-inch or 1/4-inch line repairs where low-profile access and controlled tube positioning matter. Its stated material limitation excludes stainless tubing.

Listed on Amazon as: Lisle 33260 Double Flaring Tool Kit – 3/16" and 1/4"

#5 · Three Flare Types

5. GEAROLL Brake Line Flaring Kit

• Weight: 2.38 lb
• Package Dimensions: 9.21 x 5.28 x 3.66 in

Best for: Multiple flare types for soft tubing.

Why it ranks #5: It covers 3/16-inch and 1/4-inch tubing and makes SAE double, single, and bubble flares on copper, aluminum, and nickel-copper.

GEAROLL’s kit makes 45-degree SAE double, single, and bubble flares on both 3/16-inch and 1/4-inch tubing, bringing three flare types to brake and hydraulic line tasks. Compatibility with copper, aluminum, and nickel-copper gives repairers several stated soft-tubing choices within that size range.

The two supported diameters let one kit address both 3/16-inch and 1/4-inch line work, while the single, double, and bubble flare options accommodate different stated connection styles. Its listed compatibility with copper, aluminum, and nickel-copper helps keep the tool focused on those tubing materials for vehicle brake or hydraulic-line maintenance. Stainless steel is expressly excluded because the product description says that material is too hard, so this is not the right choice for stainless-line jobs.

Skip it if you work with stainless steel; the SEEKSELF kit lists stainless steel compatibility and covers four tube diameters.

Consider it for brake or hydraulic-line work requiring several flare styles on 3/16-inch or 1/4-inch soft tubing. The listed material restriction rules it out for stainless-steel tubing.

Listed on Amazon as: Brake Line Flaring Tool Kit, 3/16" 1/4" SAE Double Flare Tool for Brake Lines, Creates Single Double Bubble Flares for Vehicle Brake & Hydraulic Lines

#6

6. Clatoon Brake Line Flaring Kit

• Weight: 2.57 lb
• Package Dimensions: 9.02 x 8.03 x 1.97 in

Best for: Under-car access across five sizes.

Why it ranks #6: Its five dies cover 3/16-inch through 1/2-inch tubing, and the kit is described as suitable for tight under-car spaces.

Clatoon’s kit covers five tubing sizes from 3/16-inch to 1/2-inch and supports both single and double flares, including work in tight under-car spaces. The included tubing cutter and five dies give vehicle repairers several named tools for preparing and flaring lines without leaving the kit.

The flaring bar, forged yoke, and five dies support the listed range of line sizes, while the cutter helps prepare tubing for the flare. Clatoon also identifies the chrome swivel as alloy steel and says it reduces friction; that detail supports smoother turning during use. Its compact design is stated to enable tight, under-car flaring, making it more suited to in-place vehicle jobs than a vise-only bench setup. The supplied facts do not specify compatible tubing materials.

Skip it if you need confirmed tubing-material compatibility before choosing a tool; the Titan 51535 specifies steel and nickel-copper.

A fit for vehicle repairs where under-car access, multiple listed diameters, and a cutter in the kit are useful. Check the tubing-material requirements against the available product information before selecting it.

Listed on Amazon as: Clatoon Brake Line Double & Single Flaring Tool Kit with Tubing Cutter

#7

7. Wostore Brake Line Flare Kit

• Weight: 5.35 lb
• Package Dimensions: 15.71 x 7.64 x 2.13 in

Best for: Seven sizes and ISO bubble flares.

Why it ranks #7: Seven dies span 3/16-inch to 5/8-inch tubing, and the kit creates SAE double, single, and ISO bubble flares.

Wostore’s kit makes single, SAE double, and ISO bubble flares, with seven dies spanning 3/16-inch to 5/8-inch. That breadth suits technicians handling varied automotive tubing sizes and flare styles, including brake, fuel, and transmission-line work identified in the product description.

Seven listed die sizes cover 3/16, 1/4, 5/16, 3/8, 7/16, 1/2, and 5/8-inch tubing, giving the kit broad size coverage for automotive line tasks. The forged-steel yoke and hardened-steel flaring bar are described as able to withstand high pressure and repeated use, supporting a more demanding workshop routine. Support for single, SAE double, and ISO bubble flares further expands the connection styles available, although compatible tubing materials are not specified in the supplied details.

Skip it if you need listed material compatibility before choosing; the Capri Tools CP21110-316 specifies non-stainless steel, nickel, and copper.

Consider it for automotive tubing work that benefits from seven die sizes and three flare styles. Its listed details do not identify compatible tubing materials, a relevant limitation when matching a line.

Listed on Amazon as: Wostore Brake Line Flare Kit, SAE Double & ISO Bubble, 7 Dies 3/16-5/8"

#8

8. TUBPRO Brake Line Flaring Kit

• Weight: 2.77 lb
• Package Dimensions: 9.25 x 9.21 x 2.09 in

Best for: Soft-line work with carry case.

Why it ranks #8: The five-size set covers 3/16-inch through 1/2-inch tubing and includes a cutter, five adapters, and a storage case.

TUBPRO’s kit covers five tubing sizes, from 3/16-inch through 1/2-inch, and makes 45-degree single or double flares. Its listed compatibility includes copper, aluminum, magnesium, soft steel, and brass, making it a broad option for softer line materials rather than hard steel or iron.

Five adapters pair with the flaring bar and forged yoke to support the stated range of tubing diameters, while the included cutter helps prepare tubing within the same kit. A blow-molded case is specified for transportation and storage, useful when the tool moves between jobs or needs to stay organized. The material range is the key boundary: the product says it is not applicable to hard materials such as steel and iron, so verify that the line itself falls within its listed soft-material scope.

Skip it if you flare hard steel or iron lines; the SEEKSELF kit lists steel and stainless steel compatibility.

Pick it for portable work on listed soft tubing when several diameters and a cutter are useful. Its material restriction excludes hard steel and iron, so it is not a universal line tool.

Listed on Amazon as: Brake Line Flaring Tool Kit, 3/16", 1/4", 5/16", 3/8" and 1/2” Double & Single Tubing Flare Tool for Copper and Aluminum Fuel Line Tube

#9

9. SEEKSELF Brake Line Flaring Kit

• Weight: 8.89 lb
• Package Dimensions: 14.29 x 6.38 x 3.46 in

Best for: Bench vise, broad size coverage.

Why it ranks #9: It covers four tube sizes from 3/16-inch to 3/8-inch and makes single, double, and bubble flares, but requires bench-vise mounting.

SEEKSELF’s kit covers four outside diameters—from 3/16-inch through 3/8-inch—and forms 45-degree single, double, and bubble flares. That combination suits bench-based line work across several listed sizes and materials, including stainless steel, steel, and some soft metals such as copper.

Four die-block sets accommodate 3/16-inch, 1/4-inch, 5/16-inch, and 3/8-inch tubing, reducing the need to switch to a separate size-specific tool across those lines. The choice of single, double, or bubble flare supports varied connection requirements, and stated compatibility includes stainless steel, steel, and some soft metals. The required vise mounting calls for a secure bench setup; the product specifically says it is not suitable for use under a car.

Skip it if you must flare lines while they remain under a car; the Clatoon kit lists tight under-car use.

Choose it for varied 3/16-inch to 3/8-inch line work at a bench, especially when stainless compatibility matters. Its vise requirement makes it unsuitable for in-place under-car repairs.

Listed on Amazon as: Professional Brake Line Flaring Tool Kit for 45 Degree Single, Double and Bubble Flares, 3/16", 1/4", 5/16", 3/8" and 4.75mm Steel Copper Metal Tubing, Black

#10

10. DPTOOL Brake Line Flaring Kit

• Weight: 9.13 lb
• Package Dimensions: 14.41 x 6.46 x 3.54 in

Best for: Bench flaring for multiple materials.

Why it ranks #10: This bench-only kit makes single, double, and bubble flares and lists 304 stainless steel, steel, and soft tubing as compatible materials.

DPTOOL’s kit forms 45-degree single, double, and bubble flares on 304 stainless steel, steel, and soft-metal tubing. That mix of flare types and listed materials makes it relevant to varied brake or hydraulic-line jobs, provided the work can be done at a bench with a vise.

The single, double, and bubble flare capability lets a repairer handle different connection styles with one kit, while support for 304 stainless steel, steel, and soft metals broadens its stated material range. The product specifically requires a vise, which means the tool belongs in a bench workflow rather than an under-vehicle repair. Its description emphasizes accurate flares for brake or hydraulic lines, but supplied information does not specify tube diameters, so selection depends on the sizes required for the job.

Skip it if you need specified die sizes before buying; the Wostore kit lists seven sizes from 3/16-inch to 5/8-inch.

A candidate for bench-based brake or hydraulic-line work involving multiple flare types and the listed materials. The required vise and unspecified tubing diameters are important boundaries for choosing it.

Listed on Amazon as: DPTOOL Brake Line Flaring Tool Kit for 45 Degree Single Double Bubble