brakes
 

I did the brakes on my 81 toyota last week and am haveing a strange issue I bled the brakes and all that good stuff so there is no air and I cant find any leaks now the issue is that i have great pedal seting and even over night but as soon as i start to drive it starts to go away it gets to where it is almost at the floor then engages or i can pump it once and it is good for another mile what could it be?

your brakes are "vaccum assist" .. that what the booster is for ...

check for some vac leaks .


.