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Brake Line Fittings

A brake line is only as reliable as the fitting that seals it. Our brake line fittings are precision-machined for leak-free connections on every joint — from a single tube nut replacement to a full system rebuild.

This collection covers every fitting type you'll encounter on the brake system: tube nuts in inverted flare and bubble flare styles, unions for joining two lines inline, compression unions for quick no-flare repairs, adapters for converting between thread sizes and flare types, banjo bolts for caliper and master cylinder connections, bleeder screws for brake bleeding, and sealing washers sized to match.

$0

$48

Showing 1 — 16 of 153 Products
Showing 1 — 16 of 153 Products
3/16" (3/8-24 Inverted) |  Tube Nut | Stainless Steel | 10ct - 4LifetimeLines
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
4 Reviews
3/16" (3/8-24 Inverted) | Tube Nut | Stainless Steel | 10ct
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
3/16" ( 3/8-24 Inverted) | Steel Tube Nut | 10ct - 4LifetimeLines
Brake Line Fitting
3.0
Rated 3.0 out of 5 stars
2 Reviews
3/16" (3/8-24 Inverted) | Steel Tube Nut | 10ct
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
3/16" Metric 10x1.0 Bubble | Steel Tube Nut | 10ct - 4LifetimeLines
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
1 Review
3/16" Metric 10x1.0 Bubble | Steel Tube Nut | 10ct
3/16" (M10x1.0 Inverted) | Tube Nut | Stainless Steel | 10ct - 4LifetimeLines
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
2 Reviews
3/16" (M10x1.0 Inverted) Stainless Steel Tube Nut | 10ct
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
3/16" (M10x1.0 Bubble) | Tube Nut | Stainless Steel | 10ct - 4LifetimeLines
Brake Line Fitting
4.8
Rated 4.8 out of 5 stars
5 Reviews
3/16" (M10x1.0 Bubble) Stainless Steel Tube Nuts | 10ct
3/8" (5/8-18 Inverted) | Steel Tube Nut | 10ct - 4LifetimeLines
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
1 Review
3/16" (M10x1.0 Inverted) Steel Tube Nut | 10ct
(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
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
3/8" (5/8-18 Inverted) | Steel Tube Nut | 10ct - 4LifetimeLines
Brake Line Fitting
5.0
Rated 5.0 out of 5 stars
2 Reviews
1/4" (7/16-24 Inverted) Steel Tube Nut | 10ct
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
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