clutch pedal pressure loss!!!

[lauee]

hi folks can anyone help me. i've just a new clutch and master cylinder fitted but i keep losing the pressure on the clutch pedal. my mechanic has bled the system twice but i keep losing pressure. normallt after a few pumps of the pedal i get the pressure back up but today the pedal got "sucked" to the floor and i couldn't get to pump the pedal. is my mechanic missing something during the bleed? he says there's no leaks anywhere and that the slave cylinder is fine. please help

[A4 Lad]

I dont know why he would replace the master cylinder before the slave cylinder for this type of fault unless there is a reason ? I would like to think that if he is able to fit the clutch that he would be able to bleed it. Im wondering if it has an internal slave cylinder and he has overlooked replacing it and does not want to remove the whole gearbox again. Why the replacement of the parts to start ?

[lauee]

thanks for the reply. not sure what he's done to be honest but the car is back with him now so i'll see how he gets on. i'll tell him about the slave. thanks again

[A4 Lad]

No problem

[lauee]

just to let you know a4 lad that it was the slave cylinder as you said. the cars as good as new now. thanks for your advice the other week

[A4 Lad]

No problems
Glad you got it fixed