brake problem

[bmx22]

ok its been like this for a while and its getting iratating. when the car is cold or sits for a while the brake pedal is really soft feeling, if i barely push the pedal it will go like half way down by itself and its like i'm slamming on the brake and the pedal is stuck there until i use my foot to pull it back up. it does this for like 10 minutes and then its totally fine all day and the pedal is firm, untill the next morrning.

what could it be, i changed the master a few months ago..could it be the brake booster its never been changed. i will bleed it before i do any thing eles but if there is air in the system it should feel like crap the whole time not just 10 minutes. thanks for any help..........

[bmx22]

any one......................

[S13Leprechaun]

defin do the brake booster... and bleed... how cold does it get at night where you live? what kind of brake fluid you usin?

[bmx22]

not cold at all i live in hawaii its like 75 at nite. stp brake fluid

[racepar1]

I am 99% positive that it is the brake booster. Air in the lines would make the pedal worse as you drive it.

[johngriff]

looks like you experience a pretty fast sweep of hummidity and baro there, from 46-80% in a day.

So im going to go with air in the lines.

Hell, just bleed it anyways, its almost free.

[bmx22]

booster thats what im thinking how do you take that thing off never changed one. do you gota take the pedal asembly off