Need to change rear brakes. Need diagram.

sounds like you have it apart and not so sure about reassembly. If these are drum brakes try looking at the drum brake change videos on Youtube, ericthecarguy (ETCG) is a good one. Drum brakes are all basically similar with the main difference usually around self adjusters.

have it deone by a pro they need to check the rotor run out as well as replacing the pads

There are no brake line diagrams,never have been

A factory service manual may show a partial on some
line,but is of no value as to what you want

You have allthe original factory lines
If they are rusted out ,etc,you copy what
you have & bend,form or change as you see fit.

If you have some type of braking issue or problem
you need to provide details & the question

You want a diagram for the rear back brakes as opposed to the rear front brakes? Just curious....

Here is a diagram of a typical GM rear drum brake system.

Try using a Web search and use Photos for the word Diagram. If you use Diagram, most likely all you will get is a linear Diagram similar to a wiring Diagram and of no use to you.
Drum brakes are easy, just take off the rubber adjuster cover and tweak the STAR wheel to collapse the brakes and make them narrower. Sometimes you may have to loosen the Emergency brake cable because it cantilevers the only brakes you have in the rear wheel. (Unlike a Rotor which has 2 brake systems inside of each rear wheel.)

take both drums off the do one whilst looking at the other in case you forget where that little spring went

what are you changing .....brake lines ...shoes ...ect ?
If you are changing the rear brakes ...buy new spring kit ...both sides are the same ....so look at one to change the other ....all GM's are the same

l rear wheel locked

Copy and paste this into your search window: 2002 ford ranger rear brake diagram

You should see four pictures pop up, select the brake parts diagram or the brake picture.

Here is the diagram,It is always a good idea to only disaasemble one side so you can use the other side as a reference,I also reccomend using a set od brake pliers,they will the disassembly and reassembly much easier.