Trouble Bleeding your clutch?

[Roamer]

Then one of the cylinders is leaking internally. I would try the easier/cheaper/older one first.

I suppose the master cylinder since its the only part that I haven't replaced

 

[sebastian323]

I had my clutch replaced, everything except the master slave which is not in the bell housing of the transmission. I've bled and bled and bled the system it works for like a week, and then it will only have a peddle of pressure when it's cold outside. Today was 80, and truck has been sitting all night. fire it up and cannot put it in any gear unless I shut the truck off then put it a gear then start it up and go. The clutch does not disengage to shift it into 2nd, or 3rd unless I rev-match it etc. when I come to a red light I have to turn my truck off shift into 1st then as the green light's I start my truck n go...

Question,

Why will it work for like 1 hr really well if it's cold outside, but when its warm or hot out it has problems mentioned above.

My truck does something similar. After about 20 min driving in city traffic it begins to have issues shifting identical to yours. If I let the truck sit for a few weeks, it gets better again. The slave cylinder and clutch are new, but the master has not been replaced.