Replaced a fail master cylinder that was leaking. Bleed the system until clutch pedal felt firm, used a pressure bleeder. After a day or two of driving, the pedal starts to get soft. I can pump the pedal to get the pedal firm again, but then will get soft after a few more miles. I have bleed the system several times, but this cycle continues. There are no visible leaks under the bell housing from the slave or the master and the fluid level in the reservoir stays full. Note - the slave cylinder is less than two years old - I replaced it when I replaced the clutch.
Any thoughts on this? I am a fairly experienced home mechanic and have worked on many cars through out the years and bleed many a clutch on VWs, BMWs and Hondas. I have never had a clutch pedal fail on the road after bleeding it.
Thanks in advance for any replies.
Mike in Cary, NC
12-06-2012 05:54 AM
Bump - No one else has experienced this with their focus?
12-06-2012 06:05 AM
Sounds like either your master or slave cylinder.
12-06-2012 11:55 AM
master is new, slave is 1 year old.
12-06-2012 12:40 PM
I would consider one of them faulty.
12-06-2012 12:43 PM
I would check the master again if your getting air in it ,even though it may be new it could very well be no good
12-06-2012 12:49 PM
did u bench bleed the master before putting it on?
12-06-2012 12:50 PM
Slave. Had the same thing happen in my Ranger. Slave was a year old, didn't replace the master when I got the clutch done and both went out.