You could have a bad master cylinder that sucks air. If you're sure you are consistently getting air in the brake line I'd suggest that a new or rebuilt master cylinder is about the only solution.
Your brakes need bleeding. And if you have antilock brakes, you should take it to a shop to bleed them. It takes special tools to bleed antilock brakes. If you have regular brakes you can bleed them yourself. Could go into further detail but would take too long to explain. Refer to a repair manual. Note: bleeding antilock brakes without first disconnecting the sensor will damage the sensor and the antilock function will no longer work (learned the hard way, unfortunately).
your back brakes are supposed to apply before your front brakes, they do this so your car does not take a nose dive every time you apply the brakes. but if it is very noticeable i would check the adjustment of your rear brakes (if you have a disc/drum setup) or i would check your proportioning valve if they are locking up
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