Well i don't like to come on a forum with a technical issue when im qualified technician, feel i should work through and find it - usually do but i've hit brick wall really. Im not a person to fit parts and try, i want to diagnose/assess/and fix,replace.
Heres the issue:
Audi a3 2004 8p, 2.0TDI(BKD)
Bought it and clutch problem raised itself(flywheel was rattling anyway)
Gears hard to select, especially reverse being furthest throw. With clutch depressed in gear, 80% of time if you bring to bite point and back down or even holding depressed, you'll lose the pedal, bite point thumps in - not enough to stall car under brakes but bite point constantly moving up/down pedal making gear change a hassle to say least and look amataur driver. Sometimes pedal sticks on floor and need to pull back up. if you hover foot over clutch while driving - pedal will drop 1/3, if you flick accelerator pedal will force back up.
I initially put problem as slave cylinder, As flywheel had failed anyway - Fitted new clutch/flywheel/slave - LUK/Sachs.
No change. Despite many pressure bleeds no progress. Decided to fit a 2nd hand 2007 model clutch pedal/master i had - No change.
Now getting frustrated and could not find any leaks under pressure bleeding, Seeked advice from more experienced pal - he swore his life on it being master cylinder despite me fitting one - 2nd hand. Voiced my 100% doubts but fitted new sachs unit for his better judgement - NO progress.
Carried out extensively looking around the clutch hydraulic line, we managed to see 2 bubbles from the bleeding unit affixed before slave in line - despite despressing many times only 2, as part was fairly rounded from previous owner ordered VW unit - Which had been revised to a much better contruction - NO progress.
Only component left in the system that hasnt been replaced for new in the line itself/black plastic unit(fitted for change of direction?)
Would anyone like to solve this?
Thanks for reading and appreciate the advice, First time ive given up!