Best Double Flare Brake Line Tool (2026): 5 Kits Compared
5 brake line flaring kits compared by flare types, tubing sizes, materials, case contents and warranty, from manual kits to one hydraulic kit.
On this page
Top picks at a glance
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- 1
Best OverallDPTOOL Hydraulic Kit9.8/10View on Amazon - 2
Best Manual KitFlexzion Flaring Kit9.6/10View on Amazon - 3
Best Bubble FlareFanmoss Flaring Kit9.6/10View on Amazon - 4
Best Soft SteelThorstone Flaring Tool9.6/10View on Amazon - 5
Best 7-Piece KitYIYITOOLS Flaring Kit9.5/10View on Amazon
A brake job turns into a line job when a rusted hard line crumbles at the fitting, and the car sits on stands until a new line is bent and flared. A best double flare brake line tool turns that tubing into a 45-degree double flare that seals at the fitting, so the pedal feels firm again. The kits below all make 45-degree flares for brake lines, and each listing is compared by flare types, tubing sizes, materials, case contents and warranty.
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Quick picks
- Best Overall DPTOOL Hydraulic Kit: Hydraulic power, 304 stainless steel and steel tubing, metric and SAE dies, and a 12 months warranty Check price on Amazon
- Best Manual Kit Flexzion Flaring Kit: 45° single and double flares on 3/16 in to 1/2 in tubing, 5 adapters, a cutter and a case Check price on Amazon
- Best Bubble Flare Fanmoss Flaring Kit: Single, double and bubble flares on 3/16 in and 1/4 in tubing, with a depth stop and a 6 months warranty Check price on Amazon
- Best Soft Steel Thorstone Flaring Tool: 45° single and double flares in copper, aluminum, magnesium, soft steel and brass, with 5 adapters and a cutter Check price on Amazon
- Best 7-Piece Kit YIYITOOLS Flaring Kit: Single, double and bubble flares on 3/16 in and 1/4 in tubing with a depth stop, in a 7-piece kit Check price on Amazon
Picks for the garage
DPTOOL Hydraulic Brake Line Flaring Tool Kit
Hydraulic brake line flaring tool kit that makes 45° single and double flares, push connect flares and ISO bubble flares on 304 stainless steel, steel and soft metal tubing, with a 12 months warranty.
Pros
- Hydraulic cylinder removes manual pressure
- Flares 304 stainless steel, steel and soft metal tubing
- Metric and SAE dies, plus push connect and fuel line dies
- 12 months warranty stated
Cons
- No weight is stated
- No dimensions are stated
- Push connect dies cover 1/4 in to 3/8 in only
- No tubing cutter size is stated
Brake Line Flaring Tool Kit
Brake line flaring tool kit for 45° SAE single, double and bubble flares on 3/16 in and 1/4 in copper and aluminum tubing, with a removable handle, a depth stop and a 6 months warranty.
Pros
- Single, double and bubble flares in one kit
- Built-in depth stop for tubing length control
- Low-profile body fits tight under-car spaces
- 6 months warranty stated
Cons
- Covers 3/16 in and 1/4 in tubing only
- No stainless steel use is stated
- No tubing cutter is listed in the kit contents
- Spec table lists 1 item against a kit of many pieces
Flexzion Brake Line Flaring Tool Kit with Tubing
Brake line flaring tool kit for clean 45° single and double flares on 3/16 in to 1/2 in copper, aluminum, brass and magnesium tubing, with 5 adapters, a cutter and a case.
Pros
- 5 tubing sizes, 3/16 in to 1/2 in
- Heat-treated steel bar and forged yoke
- Wing screws hold tubing firmly for straight flares
- Cutter and blow-molded case included
Cons
- No bubble flare is stated
- Not for steel or iron tubing
- No warranty term is stated
- No weight is stated
Thorstone 45 Degree Flaring Tool for Brake line
45-degree flaring tool for double and single flares in copper, aluminum, magnesium, soft steel and brass tubing, with 5 adapters, a tube cutter and a blow-molded case.
Pros
- 5 tubing sizes, 3/16 in to 1/2 in
- Covers soft steel lines as well as copper and brass
- Heat-treated steel bar and forged yoke
- Cutter and blow-molded case included
Cons
- No bubble flare is stated
- Not for hard steel or iron
- Bullets promise lifetime support, but no warranty term is stated
- No weight or dimensions are stated
YIYITOOLS 7‑Pcs Brake Line Flaring Kit
7-piece brake line flaring kit for 45° single, double and bubble flares on 3/16 in and 1/4 in copper, aluminum and nickel-copper tubing, with a depth stop and vise mounting.
Pros
- Single, double and bubble flares in one kit
- Built-in depth stop for tubing length control
- Low-profile body fits tight under-car spaces
- Vise assembly holds tubing centered without marring
Cons
- Covers 3/16 in and 1/4 in tubing only
- Not suitable for stainless steel pipes
- No warranty service is stated
- Needs 10 mm and 17 mm wrenches, not listed as included
Compared on paper
| Model | Shop Score | Flare types | Tubing sizes | Materials | Warranty |
|---|---|---|---|---|---|
| DPTOOL Hydraulic Kit | 9.8/10 | 45° single, double, bubble, push connect | 3/16 in to 1/2 in, 4-10 mm | 304 stainless, steel, soft metal | 12 months |
| Fanmoss Flaring Kit | 9.6/10 | 45° single, double, bubble | 3/16 in, 1/4 in | Copper, aluminum, nickel-copper | 6 months |
| Flexzion Flaring Kit | 9.6/10 | 45° single, double | 3/16 in to 1/2 in | Copper, aluminum, brass, magnesium | Not stated |
| Thorstone Flaring Tool | 9.6/10 | 45° single, double | 3/16 in to 1/2 in | Copper, aluminum, magnesium, soft steel, brass | Not stated |
| YIYITOOLS Flaring Kit | 9.5/10 | 45° single, double, bubble | 3/16 in, 1/4 in | Copper, aluminum, nickel-copper | No warranty service |
Specifications are manufacturer rated, as published on each listing and collected 11 November 2026. Where a listing contradicts itself, both figures are shown.
How the points were given
Each kit is scored on performance, build, value, safety and warranty, with the weights published on our How We Pick page. None states a safety listing, so all score zero on safety, and 3 give no clear warranty term.
| Product | Shop Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| DPTOOL Hydraulic Kit | 9.8 | 33 | 22 | 21 | n/a | 3 |
| Fanmoss Flaring Kit | 9.6 | 28 | 20 | 20 | n/a | 2 |
| Flexzion Flaring Kit | 9.6 | 30 | 21 | 21 | n/a | 0 |
| Thorstone Flaring Tool | 9.6 | 30 | 21 | 20 | n/a | 0 |
| YIYITOOLS Flaring Kit | 9.5 | 26 | 19 | 19 | n/a | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.
What the listings tell you
5 flaring tool listings went into this roundup. All 5 cover 3/16 in and 1/4 in tubing. Only 2 state a warranty term, and only 1 is hydraulic. None states a safety listing.
Buying guide: choosing the best double flare brake line tool
Single, double and bubble flares
A double flare folds the tubing wall back on itself for a seal that holds brake pressure, while a single flare is a simple cone. A bubble flare suits ISO fittings and some GM fuel lines. The Fanmoss and YIYITOOLS kits make single, double and bubble flares, the DPTOOL kit adds push connect flares, and the Flexzion and Thorstone kits make single and double flares only.
Tubing sizes: 3/16 in to 1/2 in
All 5 kits cover 3/16 in and 1/4 in tubing. The Flexzion and Thorstone kits cover 3/16 in to 1/2 in with 5 adapter sizes, the DPTOOL kit covers the same range with inverted dies, and the Fanmoss and YIYITOOLS kits cover 3/16 in and 1/4 in only. The DPTOOL kit also covers 4-10 mm metric tubing with ISO dies.
Materials: soft metal, steel and stainless
Most kits here flare copper, aluminum and nickel-copper or brass tubing. The Flexzion and Thorstone kits state they are not for hard steel or iron, and the YIYITOOLS kit states it is not suitable for stainless steel pipes. Only the DPTOOL kit states it flares 304 stainless steel and steel tubing.
Manual or hydraulic
Manual kits use a yoke and a cone anvil with wing screws or a vise assembly to form the flare. The DPTOOL kit is the only hydraulic tool here: its cylinder removes manual pressure, which helps on steel and stainless tubing.
Warranty: 6 months, 12 months or none
The Fanmoss kit states a 6 months warranty and the DPTOOL kit states a 12 months warranty. The YIYITOOLS listing states no warranty service, and the Flexzion and Thorstone listings state no warranty term. A warranty term matters on a tool that sees hard use, so check the listing before ordering.
Use rated jack stands on solid ground, wear eye protection with power and air tools, keep fuel-burning equipment out of a closed garage, and follow the manual for every tool. Read our Safety Disclaimer.
Garage Fit Check
- Check the tubing sizes before ordering: all 5 kits cover 3/16 in and 1/4 in, and only 3 cover 1/2 in.
- Keep each kit in its case on a bench shelf: the Flexzion, Fanmoss, Thorstone and DPTOOL kits state a blow-molded or portable case.
- A bench vise helps: the Fanmoss and YIYITOOLS kits mount on a vise for off-vehicle work.
- Confirm the flare type before the first job: single, double and bubble flares need different dies and adapters.
- Store the adapters with the kit: the magnetic adapter holder on the DPTOOL kit holds the molds in place.
FAQ: garage tools
What is a double flare on a brake line?
A double flare folds the tubing end back on itself to form a strong seat at the fitting. The kits here make 45-degree double flares, and the DPTOOL kit also makes push connect flares.
What tubing sizes do these kits cover?
All 5 kits cover 3/16 in and 1/4 in tubing. The Flexzion, Thorstone and DPTOOL kits cover 3/16 in to 1/2 in, and the DPTOOL kit also covers 4-10 mm metric tubing.
Can these kits flare stainless steel brake lines?
Only the DPTOOL kit states it flares 304 stainless steel and steel tubing. The YIYITOOLS kit states it is not suitable for stainless steel pipes, and the Flexzion and Thorstone kits state they are not for hard steel or iron.
Do any of these kits state a warranty?
The Fanmoss kit states a 6 months warranty and the DPTOOL kit states a 12 months warranty. The YIYITOOLS listing states no warranty service, and the Flexzion and Thorstone listings state no warranty term.
What is the difference between a double flare and a bubble flare?
A double flare is a 45-degree flare with the tubing wall folded back, while a bubble flare is a rounded ISO flare. The Fanmoss, YIYITOOLS and DPTOOL kits make bubble flares as well as double flares.
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