Clutch problem, either slave or hose?

[SupraMario]

Ok here is my problem, in the winter when it gets cold, like 40f outside, my clutch petal has no pressure it hits the floor. I know my master is fine, it was changed about 8months ago, but so was the slave, well the slave fixxed the problem for o say until late oct then when it gets cold the clutch petal goes, i have changed the slave 2 times in the years i have owned the car, and it does this every winter, i have to bleed the system for it to work again during the day, but when i leave work after it being sitting for 8 hours, its back again. no fluid is leaking either i've checked by putting cardboard under the area.
the only thing i could think of is the hose is gathering air when it cools down, as the rubber cools it gets smaller and cracks open up. but when warmed up the rubber expands sealing the crackes.
any other suggestions before i change the hose?
anyone else have this problem during the winter?

 

[Grenadian7mgte]

Try and get the steel braided line to replace that rubber one,bleed over and try and spray soap water at every connection and look for any kind of bubbles.

 

[SupraMario]

will do, ive used the soap bubbles for tire holes but didnt think of using it for this, thanks for the tip.

 

[rakkasan]

Try and get the steel braided line to replace that rubber one,bleed over and try and spray soap water at every connection and look for any kind of bubbles.

I've never tried your soap method, but I think that if there is a leak, it would be fairly obvious due to fluid. Your looking for a leak in a hydraulic system.

 

[SupraMario]

^^ see thats why i figured it wont be a leak, i would have noticed.