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Brake Line Unions

Brake Line Unions – Leak-Proof, Rust-Resistant Connections
4Lifetime offers durable tube-to-tube brake line unions in 3/16", 1/4", and 5/16" sizes. Built to withstand extreme temps, resist corrosion, and ensure a secure, lasting seal—perfect for any brake system repair.

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$44

Showing 1 — 16 of 66 Products
Showing 1 — 16 of 66 Products
3/16" 3/8-24 Inverted | Brass Brake Line Union | 10ct - 4LifetimeLines
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
4 Reviews
3/16" 3/8-24 Inverted Brass Brake Line Union | 10ct
$6.99
Black Oxide Coated Steel Brake Line Fitting 3/16" Compression Union - 4LifetimeLines LTHPCF316
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
1 Review
High Pressure Compression Fitting Union | 3/16" | Bag of 1
$3.99
3/16" | Brass Compression Union | 10ct - 4LifetimeLines
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
6 Reviews
3/16" | Brass Compression Union | 10ct
$8.99
1/4" | Brass Compression Union | 10ct - 4LifetimeLines
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
3 Reviews
1/4" Brass Compression Union | 10ct
$9.99
(3/8-24 Inverted) | Brass Brake Line Union Tee | 10ct - 4LifetimeLines
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
4 Reviews
(3/8-24 Inverted) | Brass Brake Line Union Tee | 10ct
$9.99
3/16" 3/8-24 Inverted) | Brake Line Union | Stainless Steel | 10ct - 4LifetimeLines
Brake Line Fitting
3/16" 3/8-24 (Inverted) Brake Line Union Stainless Steel | 10ct
$7.99
3/16" (Metric 10x1.0 Inverted) | Brass Brake Line Union | 10ct - 4LifetimeLines
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
2 Reviews
3/16" (Metric 10x1.0 Inverted) Brass Brake Line Union | 10ct
$7.99
1/4" (7/16-24 Inverted) | Brass Brake Line Union | 10ct - 4LifetimeLines
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
1 Review
1/4" (7/16-24 Inverted) | Brass Brake Line Union 10ct
$8.99
3/16 (M10x1.0 Bubble) | Brake Line Union | Stainless Steel | 10ct - 4LifetimeLines
Brake Line Fitting
4.5
Rated 4.5 out of 5 stars
2 Reviews
3/16 (M10x1.0 Bubble) | Brake Line Union | Stainless Steel | 10ct
$10.99
Stainless Steel Brake Line Fitting 1/4" Union 7/16"-24 - 4LifetimeLines LTBU4SS
Brake Line Fitting
4.5
Rated 4.5 out of 5 stars
2 Reviews
Brake Line Union | 1/4" (7/16-24 Inverted) | Stainless Steel | 10ct
$9.99
Sale
Black Oxide Coated Steel Brake Line Fitting 1/4" Compression Union - 4LifetimeLines LTHPCF14
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
3 Reviews
1/4" | High Pressure Compression Fitting Union | Bag of 1
$6.99 $3.99
3/16" (Metric 10x1.0 Bubble) | Steel Brake Line Union | 10ct - 4LifetimeLines
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
2 Reviews
3/16" (Metric 10x1.0 Bubble) Steel Brake Line Union | 10ct
$7.99
3/8" | Brass Compression Union | 10ct - 4LifetimeLines
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
1 Review
3/8" | Brass Compression Union
$16.99
3/16" (M10x1.0 Inverted) | Stainless Steel Brake Line Union | 10ct - 4LifetimeLines
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
1 Review
3/16" (M10x1.0 Inverted) Stainless Steel Brake Line Union | 10ct
$10.99
Sale
Black Oxide Coated Steel Brake Line Fitting 3/8" Compression Union - 4LifetimeLines LTHPCF38
Brake Line Fitting
High Pressure Compression Fitting Union | 3/8" | Bag of 1
$6.99 $3.99
5/16" | Brass Compression Union | 10ct - 4LifetimeLines
Brake Line Fitting
5/16" | Brass Compression Union
$12.99