Question about 1990 Nissan 300ZX
You've lost the integrity of the clutch hydraulic system. Chances are that either there is air in the system, the slave cylinder or the master cylinder has failed.
First step is to bleed the clutch. See if that's a fix.
A slave cylinder is down on the transmission and is relatively easy to change (only two mounting bolts, one hard hydraulic line, and an accordion-boot covered plunger). When it's changed out, the clutch needs to be bled afterward. If it's a clutch master cylinder, that's where the clutch fluid reservoir is underhood (next to the brake fluid reservoir, just to the right as you face the front of the car). Removal requires undoing the lines coming out of the cylinder, removal of the locating/mounting bolts/studs, and disconnection of the plunger rod from the back of the clutch pedal, way up under the dash. Once it's replaced, bleeding the system is required, and you also may have to adjust the pick-up point of the clutch by turning the nuts on the plunger rod - it only takes a slight turn to change the pickup point dramatically, so go slow with that.
I'd do the slave cylinder first - it's more easily accessible, significantly less expensive, and quicker to change. If it's not a fix, don't feel too badly about changing it since it's only about a $25 part and it is prone to failure, so at the very least, you've eliminated a potential problem down the road. If the slave is not a fix, I'd change the master.
Posted on Jul 27, 2008
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