Brake pedal fully pumped after turning off car

[JSolo]

^^Wow.. really. My G or accord could sit for weeks without bleeding down. My driving habits haven't changed. Car didn't used to do this before.

 

[LetekHimself]

Im getting this too now. Car needs to sit for a few days. Just under 2 years old now and ~8500 miles. Starts (with some added effort) and runs/brakes fine.

As in this very thread. They said there is a recall on the brake booster a tsb about the check valve to the brake booster.

 

[Snowwhite]

it's the brake booster. I had mine replaced (warranty, but 3 visits to one dealer and then a 4th to a different dealer who actually diagnosed and replaced it) and the problem went away. Dealer #1 replaced the vacuum pump, check valve, and vacuum lines, none of which fixed it. Dealer #2 did the booster and the next morning brake pedal had held boost all night so I had no issues starting the car.