Ever since I bought the truck My brakes have gone close it the floor

More than likely you have a leak or still have air in the lines that you have not found yet.

here are some guides that will help with this:

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

Below you will find the process from the master cylinder and bleeding the brakes. I would suggest removing the lines from the master and capping them off to see if you have a hard pedal. If you do not then your master is faulty. If you do then start adding the lines back in one at a time until you find which leg is was that is causing the pedal to drop.

Please let us know what you find. Thanks

The RABS valves do leak internally and may well be the problem, but try bleeding it first You do need to bleed that valve first before doing the wheels in the order that you are doing them.

You will need to have the ABS valves opened when you are bleeding the system which it will take scanner to do here is a video to show you.

https://youtu.be/rTtAnsOlZU4

You can get plugs for the ports in the master cylinder. Remove the lines and plug those ports. The pedal should be rock hard. IF you don't get that, replace the master cylinder. I have had issues with new ones right out of the box. Most often the reman ones, rarely on new ones.

This guide can help as well

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Please run down these guides and report back

The RABS II master cylinder and hydraulic control unit must be bled using Anti-Lock Brake Adapter tool No. T90P-50-ALA and Jumper tool No. T93T-50-ALA or equivalents. If this procedure is not followed, air will be trapped in the hydraulic control unit which eventually leads to a spongy brake pedal.

Bleed system as follows:

Place bleed/harness switch on bleed adapter tool to bleed position.
Turn ignition switch to On position. At this point, the red OFF indicator should turn on.
Push motor button on the adapter down. This starts the pump motor.
The red OFF indicator turns off and the green ON indicator will turn on.

The pump motor will run for 60 seconds once the motor button is pushed. If the pump motor is to be turned off for any reason before 60 seconds has elapsed, push the abort button and the pump motor will turn off.

After 20 seconds has elapsed, push and hold the valve button for 20 seconds. This will bleed any trapped air from the master cylinder and hydraulic control unit.
The pump will continue to run for an additional 20 seconds after the valve button is released.

This guide can help

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

Yes, you can run new lines around the ABS unit. Can you make sure one of the front brake caliper slides is not frozen? This will cause the problem you have described here is a guide that should help:

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

Please run down this guide and report back.