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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.

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
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
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" | 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
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
(3/8-24 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
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