Rick's Free Auto Repair Advice

Brake line fitting sizes

What are the brake line fitting sizes?

How brake line fittings are measured

Brake line fittings are divided by the type of flare, either inverted, bubble or DIN, brake line diameter, and thread count.

To measure thread count you’ll need a thread pitch gauge like this:

thread gauge

For SAE applications you’ll be measuring threads per inch. For metric applications, you’ll be measuring threads per millimeter.

Brake line inverted flare versus bubble flare

types of brake line flares

Most common brake line sizes

Most cars and light-duty SUVS and CUVs use 3/16″ diameter brake line. Larger trucks often use 1/4″ lines.

inverted flare fitting chart

bubble flare fitting chartinverted brake line fitting

bubble flare fittings

Posted on by Rick Muscoplat


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