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1996 Chevy S10 hydraulic clutch leaking down while sitting

Clutch fluid leaking down when truck sits. haven't checked for months and had no problems then one day is hard shifting. first thought was check fluid level and was low to point of maybe air in line so I filled and bled system. ran a few days until hard shifting again. fluid again low so fill and bleed again. not really seeing leak on truck or ground. pattern continues over a week or two but still not seeing obvious leak. checking fluid level all the time now. what i've noticed is this:fluid level goes down while truck is sitting. i commute 43 miles 1 way to work. make sure master cylinder is full at house and drive to work. clutch works great as long as fluid in it. check at work and still full after the commute-not losing much under pressure of driving. after shift of 8 hours, master cylinder is low again on fluid. fill before driving home and all is great-still full after pulling in driveway. next morning is low again when time to leave for work. never drains completely out-bottom of reservoir still covered just enough that air not getting into the line. top off fluid and make my commute with no problems with clutch operation at all. bleed screw is tight so not leaking there. Is there a fitting or gasket which could have gone bad causing this slow leak? Any fix without removing trans and replacing whole clutch as there appears to be no problem with clutch itself.

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Posted on Jan 02, 2017

freetek
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SOURCE: soft clutch 1992 isuzu rodeo

If the seals around the shafts of master and slave are tight, they may be concealing a leak with fluid bypassing the piston seals internal to the two assemblies. Either your master or slave cylinders need to be replaced ot have new seals installed. Once you find the culprit and have installed a replacement, you will have to bleed the lines to evacuate air trap in the lines.

Posted on Mar 21, 2009

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SOURCE: Abnormal clutch pedal operation

You've replaced the master, the slave, now I would check to see if the throwout fork will move by hand. If you can move the fork by hand I would say that your pressure plate and or throwout bearing are worn out. First try to just gravity bleed the system. If that doesnt work, it may be time for a clutch, pressure plate, and bearing. The pressure plate spring pushes the pedal back up and depending on how many miles and driving habit those little arms on it break off and just wear out. I hope this helps you.

Posted on Aug 19, 2009

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