Ok, ive been having some brake issues with my truck. I took it to shop and they said it was the brake booster, got it replaced and adjusted, but the problem persists.
What its doing is this: Sometimes, not all the time, my brake pedal gets very firm, other times it goes down about 3-4", but when it gets hard I can onlt press it about 1-2". It does this at random times. The pressure I need to apply is not consistant. I believe the vacuum line if fine as when I press on the brake and turn engine on, it depresses. What else do I need to have checked?