Conversation Between Rongold and frogjaw

You are the only person who replied to my post about brakes on a 2012 Ford F250. I replaced the brake booster again toda.. It built up pressure, but when you push the brakes the pressure drops to 5. I know the pressure is supposed to drop some but it doesn't come back. Do you have any ideas on how to fix this. I REALLY don't want to take the truck to the stealership.