there is brake fluid on the ground brake flex hose

Hello, I'm Danny.

Here is the information you requested for brake line flex hose replacement. After replacing the line you will have to bleed the system to remove the air from opening the system. Here is a tutorial showing how to change the bleed the brake system after the repair.

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

I've attached picture steps below on how to change the brake hose on your truck. Hope this helps and thanks for using 2CarPros.