Replaced gear oil in 85.5 944 yesterday and as I drove off after a couple of shifts clutch pedal remained on the floor and I was unable to shift. Limped the car home in first gear with some pissed off F150 behind me giving me the finger and was able to pull up on lift and kill the ignition. I don't see how changing the transaxle oil could have anything to do with this problem, but just wondering if more than a coincidence. Any thoughts as to problem? Slave or master cylinder, or other? Did I inadvertently create a problem, just another old 944 issue? Thanks in advance.

 

Coincidence.

Clutch hydraulic problem (air in system, slave, master, line in increasing order of probability). If you are really unlucky, clutch release arm has broken.

 

My experience would indicate the clutch slave cylinder has failed

 

Check for leaks under the dash far left side ( clutch master like to go bad first

David Pagan Promotion Porsche 944 Clutch master Replacement ( pedal on the floor) leaking can been in side the car upper driver side foot well above the clutch pedal.

Porsche 944 Clutch master cylinder and hydraulic Hose from master to clutch slave cylinder . David Pagan Promotion

 

My experience is clutch slave cylinder fails before clutch master cylinder. I had difficulty disconnecting slave cylinder from piping at the clutch. The nut would not turn on the steel tubing even with mega amounts of rust buster. My fix was to use a tubing cutter in the horizontally run to separate the tubing. Reconnected tubing with steel compression fitting from McMasters. Do not remember mm size.
Then bleed the slave cylinder. It might take some pumping of master to complete bleed of circuit.

Replacing the clutch master cylinder is a b**ch, unless you can remove the connecting rod still connected to clutch pedal from the MC. I did not try it, had race shop replace that one since I was replacing the engine

 

Trick I learned here on RL: unbolt fuse box and pull up to reveal nice clear path to clutch MC + pedal connection. The harness is a bit stiff.. but otherwise, works great for me