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Clutch goes soft when truck is running


New Member
June 15, 2010
Reaction score
City, State
Anchorage, AK
Year, Model & Trim Level
'92 XLT
I've got a 1992 XLT. I just had the clutch slave replaced, and after about 50 miles, it became hard to get it into gear. Figured it needed to be re-bled, so I took it back to the shop. The master cylinder was leaking, so had that replaced, too. Now, when the truck is off, I have a good, firm clutch. As soon as I start it though, the pedal goes almost completely soft. I'm stumped. I don't know why having the engine running should impact the hydraulics of the clutch. Anybody have any suggestions?