brakes not working propperly?

It sounds like the brake master cylinder went out here is how to replace the unit which must be bled before it is installed. Also, check the front and rear brake pads/shoes. Here is a guide and a video to help and the instructions on how to replace the master on your truck in the diagrams below:

https://youtu.be/WDxvEQrMkBg

and

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

This guide may help as well:

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

Check out the images (below). Please let us know what happens.

i bled the master cylinder and then bled the brakes. the pedal felt better but the brakes did not work.

Can you explain the brake not working, do you have good pedal? does the brake have pedal but not stop the car? Can you please shoot a quick video with your phone so I can see what's going on? that way I can tell for sure what's going on.. You can upload it here with your response.

yes, the brake has pedal but does not stop the car.

Okay, start the car and then shut it off, then remove the vacuum check valve from the booster and you should hear vacuum escaping, if not the booster is defective and needs to be replaced.

After i bled the brakes, the braking system is now fully functional. Thank you Ken L for your knowledge and helpful hints.

Thanks for letting us know, we are here to help, please use 2CarPros anytime.