1997 T100 Brake Booster??

I think my brake booster is going out on my T100. It doesn't do it all the time but I can be sitting at a red light with my foot on the brake pedal and the pedal seems like it looses pressure (resistance) and goes down closer to the floor, when it does this sometimes it will roll slightly. There are no leaks on any of the wheel cylinders or any signs of leaks on or around the brake booster, the reservoir is full also. What say you guys?

Steve..........

 

When was the last time you bleeded your brake lines? Air in the lines can cause that.

 

Never bled the brakes, might have to check that out. Wouldn't that do it most of the time? This only happens about one out of four times I'm stopped.

Steve...........