How to check if a brake booster is good or not?

No I don't believe it doesn't, I will have to double check.Seems the pedal travel is not much at all.It doesn't stop the best.If you stand on the pedal hard it stops better.I checked all the brakes and adjusted the rears,but the pedal travel still feels the same and the car stops the same.If you pump the brakes it doesn't feel any different so I don't think there is air in the lines.