1993 Toyota Camry brakes problems

(1) break is not functioning properly, break light is showing, after adding fluid light disappear and function after several pumping, pushing of the break down and releasing towards up. Seems limited friction to function the break. Went to mechanic shop, was unable to detect, rather filled with break fluid and injected break fluid through physical pumping to the break. Works until few miles drive , after that break fluid level start falling down and break start to loose its function.

I have had to replace the brake calipers on the front brakes twice. The rotors are so warped from all of the friction heat that they will have to be replaced soon. The driver's side mirror quit working and then the driver's side power lock switch and then the passenger's side front window control stopped working the air conditioner compressor was replaced at about 45,000 miles and has gone out again just recently. The power steering unit leaks oil.