When I press on the brake, sometimes it is hard to press down. Then when I push real hard, it goes back to working fine temporarily. It sounds like I'm letting air out of something when I press on the brakes. If I press real hard, it makes a screaming noise.
It sounds like your brake booster is worn out. There is a diaphragm inside the booster that wears out and will not allow the booster to get enough vacuum to work properly. I would have a technician from YourMechanic come out and perform a brake inspection and inspect the brake booster.
Have a car question? Get free advice from our top-rated mechanics.
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing