Knowledge Garage

A step-by-step guide to repairing nylon and steel fuel lines safely — relieving fuel pressure, splicing in new line with quick-connects or unions, and leak-testing before you drive.

Every common banjo bolt thread size in one chart, plus how banjo fittings actually seal, why crush washers are one-time-use, and how to measure the bolt you have.

Learn how to flare a brake line the right way: bubble vs. double flare, how to choose a brake line flaring tool, and the mistakes that cause leaks.

Replace a brake hose when it is cracked, bulging, leaking, chafed down to the reinforcement, or when the pedal feels spongy or the brake drags after you let off. Do both hoses on an axle at the same time, use new copper crush washers on every banjo connection, install the...

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 rest of the line is sound. Here's how to tell, and how to do it right.

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.