How to Repair a Brake Line: Leaks, Rust-Through, and Broken Lines Fixed Right
You can repair a damaged brake line by cutting out the bad section and splicing in new tubing with flared unions, but only if the damage is isolated and the ...
Copper-nickel brake lines & fittings
Brake lines that never rust.
Copper-nickel lines bend by hand, flare clean, and won't rot out like factory steel. Backed by a lifetime warranty.
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4LifetimeLines
Complete Cu-Ni Brake JobWhat's included
- 3/16 in. x 25 ft Copper-Nickel Brake Line Kit
- 3/16 in. Fitting Assortment — 24 SKUs
- 3/16 in. Handheld Line Straightener
$143.23$150.77Save $7.54
4LifetimeLines
Stainless Brake Line JobWhat's included
- 3/16 in. x 25 ft Stainless Steel Brake Line Kit
- Professional Flare Tool Kit — SAE double & ISO bubble
$99.73$104.98Save $5.25
4LifetimeLines
Flare Tool + Extra DiesWhat's included
- Professional Flare Tool Kit — SAE double & ISO bubble
- Flaring Dies — 3/16, 1/4, 5/16, 3/8 in.
$143.14$150.67Save $7.53
4LifetimeLines
Compression Union 3-PackWhat's included
- 1/4 in. High-Pressure Compression Union
- 5/16 in. High-Pressure Compression Union
- 3/8 in. High-Pressure Compression Union
$13.07$13.76Save $0.69
4LifetimeLines
Turret Flaring SetupWhat's included
- Professional Turret Flaring Tool — quick-change turret
- 3/16 in. Handheld Line Straightener
$229.92$242.02Save $12.10
4LifetimeLines
5/16 Nylon Fuel Line SetWhat's included
- 5/16 in. x 25 ft Nylon Fuel Line Coil
- 5/16 in. Steel-to-Nylon Push-On Connectors (2 ct)
$24.68$25.98Save $1.30
4LifetimeLines
PVF Steel Line DuoWhat's included
- 5/16 in. x 25 ft PVF-Coated Steel Coil
- 3/8 in. x 25 ft PVF-Coated Steel Coil
$31.33$32.98Save $1.65
4LifetimeLines
Stainless Tube Nut SetWhat's included
- 3/16 in. (7/16-24 Inverted) Stainless Tube Nuts (10 ct)
- 3/16 in. (3/8-24 Inverted) Stainless Tube Nuts (10 ct)
$19.93$20.98Save $1.05
4LifetimeLines
Cu-Ni Coil TrioWhat's included
- 3/16 in. x 25 ft Copper-Nickel Coil
- 1/4 in. x 25 ft Copper-Nickel Coil
- 5/16 in. x 25 ft Copper-Nickel Coil
$94.02$98.97Save $4.95
4LifetimeLines
Brake Line + Rock GuardWhat's included
- 3/16 in. x 25 ft Copper-Nickel Brake Line Kit
- 3/16 in. x 16 ft Stainless Steel Gravel & Rock Guard
$42.73$44.98Save $2.25
4LifetimeLines
Master Flaring SetupWhat's included
- Master Flaring Tool Set — SAE double & ISO bubble
- 3/16 in. Handheld Brake & Fuel Line Straightener
$102.63$108.04Save $5.41
4LifetimeLines
Nylon Fuel Line KitWhat's included
- 3/8 in. x 25 ft Nylon Fuel Line Coil
- 5/16 in. x 25 ft Nylon Fuel Line Coil
- 3/8 in. Steel-to-Nylon Push-On Connectors (2 ct)
$43.67$45.97Save $2.30
4LifetimeLines
Fitting Size Gauge SetWhat's included
- SAE Brake Line Fitting Size Gauge
- Metric Brake Line Fitting Size Gauge
$24.28$25.56Save $1.28
4LifetimeLines
Pro Brake Line SetupWhat's included
- 3/16 in. x 25 ft Copper-Nickel Brake Line Kit
- Pro Flare Tool Kit — SAE double & ISO bubble
- 3/16 in. Fitting Assortment — 24 SKUs
$156.53$164.77Save $8.24
4LifetimeLines
Brake Line + Matching FittingsWhat's included
- 3/16 in. x 25 ft Copper-Nickel Brake Line Coil
- 3/16 in. Metric 10x1.0 Steel Tube Nuts (10 ct)
- 3/16 in. Compression Union Fitting
$35.12$36.97Save $1.85
4LifetimeLines
Dual-Size Line SetWhat's included
- 3/16 in. + 1/4 in. Copper-Nickel Line & Fitting Set (2-pack)
- 3/16 in. Brake Line Tubing Clamps (10 ct)
$63.07$66.39Save $3.32
4LifetimeLines
The Brake Line JobWhat's included
- 3/16 in. x 25 ft Copper-Nickel Brake Line Kit
- Pro Flare Tool Kit — SAE double & ISO bubble
$89.28$93.98Save $4.70
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Trusted by thousands of DIYers & pros
Real ratings from real customers
4.8
From nearly 4,000 Amazon seller ratings
96%
Rate us 4 or 5 stars on Amazon
5.0
Google Customer Reviews
The best non rusting brake lines and fittings on the market that aren’t over priced!
I recently purchased brake lines for the 4th time from 4Lifetime Lines, and I couldn’t be more impressed with the quality and service. Their products are top-notch—durable, reliable, and easy to install.
Quality brake line
I had to run new brake lines on my 2006 Subaru Legacy. This line has been very easy to work with, very flexible and easy to flare.
Easy to form, flares easy
Good quality. Easy to form and bends with hands or bender. Forms flares easy without difficulty.
Amazon figures are lifetime seller feedback ratings.
Pick the right line
Why copper-nickel?
Factory steel lines rust from the outside in. Here's how the replacements compare, so you only do this job once.
| Feature | Our pickCopper-nickel | PVF-coated steel | Stainless steel | Factory bare steel |
|---|---|---|---|---|
| Rust | Won't rust | Resists it until the coating is nicked | Won't rust | Rusts — why you're replacing it |
| Bending | By hand | Bender recommended | Bender required, springs back | Bender recommended |
| Flaring | Easy with a standard tool | Strip the coating first | Hard — pro or hydraulic tool | Standard tool |
| Best for | Most DIY and shop repairs | OEM look on a budget | Show builds, max strength | — |
| Shop | Shop copper-nickel | Shop PVF | Shop stainless |
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The Knowledge Garage
Guides from the people who make the parts
Start with a guide
Brake Line Replacement
When to replace, tools to use, routing, and bleeding — the full job, step by step.
Read the guide →Brake Line Flaring
Double vs. bubble flares, choosing a flaring tool, and technique for leak-free joints.
Read the guide →Fittings & Sizing
Tube nuts, unions, adapters — and how to pick the right line size the first time.
Read the guide →Materials & Corrosion
Copper-nickel vs. coated steel, why lines rust, and how to stop it for good.
Read the guide →Latest from the garage
Open-End vs. Box-End vs. Ratcheting Wrenches: Which to Grab
Open-end, box-end, ratcheting, line wrench, or crowfoot? What each wrench style is actually for — and which one to reach for on line fittings.
Double Flare vs. Bubble Flare: How to Flare a Brake Line the Right Way
Double flare or bubble flare? Learn which brake line flare your car needs, how to make a leak-free flare step by step, and the tools that get it right.
Dielectric Grease: What It Is, When to Use It (and When Not To)
Dielectric grease is a silicone insulator, not a conductor. Here's where it belongs on your vehicle, where it doesn't, and how to apply it correctly.