Answer
Feb 03, 2026 - 09:45 PM
On a 1968 Dodge Dart GT, the factory brake hard lines are 3/16-inch steel tubing throughout the car, which is standard for Chrysler A-body vehicles of that era. The fittings are SAE inverted (double) flare, not metric. Most of the brake line nuts are 3/8-24 thread, though some junctions (such as the master cylinder or distribution block) may use 7/16-24 fittings depending on whether the car has manual or power brakes.
When replacing all the lines, it’s best to use 3/16" pre-flared steel, stainless, or NiCopp line and match the fittings as you go, since aftermarket masters or proportioning valves can vary slightly. If you’re doing a full system refresh, it’s also a good idea to inspect or replace the rubber flex hoses at each wheel, as old hoses can swell internally and cause braking issues even with new hard lines.
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