I would say; it comes down to two possible issues: mechanical or hydraulic.
1. hydraulic
a. any leaks at the slave or master cylinder? If there are leaks; this would indicate a failure and require a replacement of the part.
b. bleed the system; to confirm no hydraulic issues: use reverse bleeder to correctly bleed the system, (phoenix systems v reverse bleeder)
c. once you have bled the system; aside from the master or slave cylinder being bad, you can move on in your troubleshooting process.
2. mechanical
a. is the shifter assembly; in good condition and correctly adjusted?
b. is the clutch correct one for your application?: what specific model # of clutch did you install: e.g. flywheel, disk, pressure plate etc. (check below; for the sachs/zf online parts catalog)
c. was the clutch installed correctly? disc in the correct orientation? throwout bearing installed as it should be?
d. actual clutch failure: something may have broken, fallen off or just isn't right. unfortunately, this requires pulling the trans to investigate the clutch and make sure everything is ok.
Once you bleed the system and you are confident, the shifter assembly is adjust/good working order; then, I would contact the vendor that sold you the clutch. I would confirm; that the parts are correct for your application and see what they think, could be the problem with the clutch.
Here is a excellent; troubleshooting guide by LUK:
file:///Users/williampelzel/Downloads/Clutch%20System%20Failures.pdf
You might also contact Sachs/ZF technical service/support:
Passenger Cars
and Light Trucks
Customer Service & Technical Hotline
1-800-321-0784
You can also; look up your car and see what clutch kits, are listed for you application/vehicle:
ZF Services Online Parts Catalog
1. hydraulic
a. any leaks at the slave or master cylinder? If there are leaks; this would indicate a failure and require a replacement of the part.
b. bleed the system; to confirm no hydraulic issues: use reverse bleeder to correctly bleed the system, (phoenix systems v reverse bleeder)
c. once you have bled the system; aside from the master or slave cylinder being bad, you can move on in your troubleshooting process.
2. mechanical
a. is the shifter assembly; in good condition and correctly adjusted?
b. is the clutch correct one for your application?: what specific model # of clutch did you install: e.g. flywheel, disk, pressure plate etc. (check below; for the sachs/zf online parts catalog)
c. was the clutch installed correctly? disc in the correct orientation? throwout bearing installed as it should be?
d. actual clutch failure: something may have broken, fallen off or just isn't right. unfortunately, this requires pulling the trans to investigate the clutch and make sure everything is ok.
Once you bleed the system and you are confident, the shifter assembly is adjust/good working order; then, I would contact the vendor that sold you the clutch. I would confirm; that the parts are correct for your application and see what they think, could be the problem with the clutch.
Here is a excellent; troubleshooting guide by LUK:
file:///Users/williampelzel/Downloads/Clutch%20System%20Failures.pdf
You might also contact Sachs/ZF technical service/support:
Passenger Cars
and Light Trucks
Customer Service & Technical Hotline
1-800-321-0784
You can also; look up your car and see what clutch kits, are listed for you application/vehicle:
ZF Services Online Parts Catalog
Was the master cylinder; a used unit; when you did the swap or a new replacement part?
