Brake question

[Max.Powerzz]

I somewhat recently had my brakes completely redone by a thorough cruiser shop. Lately if I'm sitting at a complete stop for over 15 seconds or so, the pedal will suddenly get mushy and the truck starts to go forward. I can then push down harder and the truck comes to a complete stop. It doesn't happen all the time, just randomly. Does this sound like I have air in my brake lines? Thanks!

 

[Tapage]

Air or bad brake master seals .. I suppouse you already check all corners for leaks ..

 

[agent orange]

In addition to what tapage said, maybe your brake booster could be leaking air. I would think that a seal issue would be a problem all the time, not just after sitting a long time.