What size it the brake line on a 1993 Ford Taurus?

The brake line size on a 1993 Ford Taurus isn't a single size. Different sections of the brake system will likely use different sizes. You'll need a shop manual specific to that year and model to get the precise sizes for each section (front to master cylinder, rear to master cylinder, etc.). Even then, it might be described by its inside diameter (ID) or outside diameter (OD), which can be confusing.

To find the correct size:

1. Consult a Repair Manual: A Haynes or Chilton repair manual for a 1993 Ford Taurus is your best bet. These manuals usually have diagrams showing the brake system and specify the line sizes.

2. Measure the Existing Lines: If you have access to a section of the old brake line (after carefully removing a portion), you can measure its outside diameter (OD) with calipers. However, this is less reliable than using a shop manual because different sections might use different sizes.

3. Check with a Parts Store: Take your VIN to an auto parts store. They can use their computer system to look up the correct brake line sizes for your specific vehicle. This is probably the easiest method if you don't have a repair manual.

Important Note: Working on brake lines requires expertise. A leak in the brake system is extremely dangerous. If you're not comfortable working on brakes, take your vehicle to a qualified mechanic. Incorrect brake line sizing or installation can lead to brake failure.