brake problem

my 95 pathy's brake pedal seems to go further down the longer i drive but if i get under it and adjust the rear brakes it is good again, but as time goes on it happens all over. is there any thing i can do so this stops happening?

check ur brake lines, if not that. your brake fluid might be low... good luck!

You might want to check your rear brake adjusters.All brakes have automatic adjusters to keep pedal height up automatically as brakes wear.These adjusters{some call it star wheel ?}are left and right hand threaded.If they are on the wrong side they will perform the opposite.
Good luck