2004 Pontiac Grand Prix noises

Hi i recently took my car to the deal to do the back brakes. i was told that the front wheel hub needs to be replaced its making a noise. so i had a friend who works on car look at it and he said he thinks its the sway bar link that need to be replaced. and now my wife says that she hears a noise under the hood but really only when she turns left. she also tells me that the abs light keeps coming on since the dealership did the brakes. any ideas i wish i could say more but i am in the military and not at home so all i have is what i have been told by my wife. thanks for any help.