also my engine management light comes on sometimes?

both my abs and engine management lights on my dashboard display, come on from time to time.
the oils level and cleaness appears ok, and water and antifreeze look fine.
are the pads starting to wear? or is it more likely there's a bigger problem with the breaks/abs?
i've took my car to 3 garages, 2 of which said they were to busy to look at my brakes, the other garage said they couldn't help. i needed an auto electrian.
i thought my brakes were behind the wheels. however noone bothered to look at them. is my car safe to drive? do i need brakes?
it appears to me, that to all these 3 national garages, my brakes were not an important essentical on my car. or surely they would of looked.
2nd. my engine management light sometimes comes on and stays on for a while. but not often. there seems to be nothing wrong with the opperation of the car. it has 45000 miles so quiet low. does anyone have any advice please? is there anything i should be looking for? except for a gararge that reguards the opperation of my cars brakes exstremly important. after all i'll be driving down their road soon.
lastly, should i report these garages? i could of understood them being to busy if i'd ask for a new heaterswitch.