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The 2002 Buick LeSabre uses a 3/16-inch bubble flared brake line, which you can purchase in twenty-five foot rolls. You can find the necessary fittings at most local auto shops. Additionally, you will need to obtain a bubble flare tool if you don't already have one. If you plan to replace the brake line yourself, be prepared for a challenging task. Mechanics usually estimate the job to take around ten to twelve hours, costing nearly a thousand dollars if done at a shop.
The brake line diameter for a 2002 Buick LeSabre is 3/16 inches or approximately 4.75 millimeters.