manual recommends Dot 3.
no idea it is probably using the brake fluid
see link
Depends on the fluid. 3.6 liters for oil.
there are no 2000 yaris that would be an echo
Check the fluid.
Yes. The fluid should look clean and pink.
it dont have to, change your brake shoes/pads every 30000 miles or whatever
To replace your brake light, you need to unscrew the brake cover from the inside of the trunk. Then you will be able to pull the old bulb out and replace it.
How to open hood on Toyota echo
yes
The rear brake shoes between the two cars are probably the same. Afterall they are both the same car, just with a different name, so I think that the brake pads are the same to go along with it.
If you are asking if you can tow with a Toyota echo, the answer is yes. See related link for a video of a Toyota Echo towing a small trailer (and off roading).