Strange clutch fault?! - Kia Forum
 
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post #1 of 3 (permalink) Old 12-01-2012, 06:01 AM Thread Starter
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Question Strange clutch fault?!

vehicle is a 2006 kia sedona, facelift model, 2.9 crd diesel

Vehicle has come to us with the following fault.
clutch pedal starts off fine biting point in middle of pedal range, then after short drive biting point progessively gets worse biting lower and lower. then pedal goes light and gears can not be selected.
pump the clutch pedal 3 times and biting point returns to middle and good pressure behind pedal is back and all is well?

Genuine kia clutch master cylinder fitted.
fixed fault for 3 months
clutch dies. Genuine kia clutch kit fitted with slave cylinder
5 months later vehicle returns with same fault master cylinder changed under warranty from kia.

Fault still remains

New o-ring fitted to bleed nipple housing on clutch pipe work, slave union cleaned and checked for flow.

Bleed clutch up so nice hard pedal biting point in middle, on road test bitting point slowly sinks to bottom of pedal range, then gears can not be selected.
pump pedal twice and good pedal returns with biting point in the middle.
no leaks from any joints and no fluid loss from slave
when fault is present slave does not operate at all no movement can be seen
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post #2 of 3 (permalink) Old 12-12-2012, 05:02 AM
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In Hyundai cars, there's a check valve inside the slave that routinely gets gunked up and causes all sorts of weird problems like that. If it was my car, I'd remove the line from the slave. Just inside the orifice is a little piece of spring metal with a coil spring behind it... that's it. Just throw it away, you don't need it.
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post #3 of 3 (permalink) Old 12-19-2012, 05:28 AM Thread Starter
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problem is all sorted clutch bleed nipple was leaking past the threads. was a combination of this and slight pedal adjustment
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