This direction is for the front: Remove the wheels (if this is hard, try to wedge a really large screw driver through the holes in the steel of the wheel against the caliper. I used an old tire iron to pop them off.) Remove the calipers (two bolts on either side )swing them out of the way & rest on the spring/ strut, then remove the cradles that hold the brake pads (two bolts on either side). Spray the outside circle around the hubs (the area outside where the large nut is) with penetrating oil (WD-40 or PB Blaster). There are two small bolt holes with threads on the face of the rotor between the wheel studs. You need to find two bolts that'll screw in till they bottom out. Then tighten these bolts slowly, and evenly. The rotor will start to pop little by little and will fall off. To reseat the new rotor, just tighten the lugnuts (or a bolt of the same size as the wheel threads if your lugnus are too short) on without the wheel to seat them again.
yes
In the gas tank. I have 2001 Echo.
Remove the immobilizer unit?
2001 Toyota Echo doesn't have a timing belt.
http://www.carspace.com/guides/Toyota-Echo-How-to-change-oil
http://pdftown.com/2000-2002-Toyota-Echo-Service-Manual.html
Yes
Look in the trunk, there is cover for the brake light, remove and you will have access to change the bulb.
3.5 Liters
toyota echo 2003 does it have a timing belt or timing chain.
see link
timing chain.