Driving on front brakes only

[theyammieguy]

So I did the first real inspection on my new truck this morning and this is what I found.
Left rear pads are gone, just bare metal.
Right rear fell apart when I pulled the drum off.
All the metal brackets on the right side are chewed up and cannot be reused.
I've never driven a vehicle with manual brakes so I thought having to press real hard on the pedal was normal.
Also a couple other pictures.
Noticed, the tranns lines are leaking at thr radiator.
I did wire up the wiper motor so know I can see when it rains.