You probably did not lubricate the calipers when you changed them and they are sticking. Or its entirely possible that the rotors are too thin. Always clean and lubricate the brake assembly before reassembly.
Never.
Did you check the vacuum hose or did you refill the brake fluid?
Sometimes it happens because of rotors. If they are old and have a lot of grooves on its surface it will cause the grinding noise. Also it might happen if brakes were not cleaned properly during the replacement.
Not changing the transmission fluid in a car within 200K would cause problems.
Changing the plugs and plug wires correctly has nothing to do with nor can it cause an oil leak.
Lack of oil changes. Will. Cause a bering to spin
Inspect your calipers make sure pistons are working
no different then changing the brakes on any other car all u need is some c clamps and what ever u would normally use elsewhere
You probably have something wrong with your engine, or brakes. You should really have that checked.
Sounds as though you still have air in the cylinders at rear.
poor battery cable connection
First step try changing the fluid and filter First step try changing the fluid and filter Check