Which brakes are you getting the air out of? If it"s the rears then most likely the brakes are out of adjustment or you are pulling in air around the cups. Seems that ever since the manufacturers stopped putting expanders on the ends of the wheel cylinder springs(inside) that problems like this crop up. The other replies make some very good points about tight line connections and such and I personally never fully trust "new" parts now that so much is made in China
