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Q:

brake pedal hard to press often and when depressing releases air from pedal on 2007 Ford Edge

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very hard to stop and just started this. Have to press really hard to slow down. Lots of air comes from the rubber holey boot behind pedal. Does the same thing in reverse?? HELP PLEASE
Also there are no codes present. Pedal even hard when sitting still in park
(1) Answer
Sounds like your brake booster is going out. it works on vaccum from the engine when you apply the brakes the vaccum assist you with pressure. if the seal goes bad you lose the pressure and assistance. so its like you have non power brakes which is a safety issue.