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Acura NSX Clutch Master and Slave Cylinder Change

A soft or spongy clutch pedal, disappearing clutch fluid, or difficulty shifting can be signs of a bad clutch master and/or slave cylinder. It is generally recommended to change both at the same time since if one unit has gone bad, after the repair the other one will usually fail soon after due to the added hydraulic pressure.



In order to remove the clutch master cylinder, first remove the cruise control unit. There are three 10mm bolts holding it down.
One of the 10mm bolts holding the cruise control unit is a little tough to get to, thus a wobbly with an extension comes in handy. Next, remove the 10mm bolts holding the clutch fluid resevoir. Be sure you drain the resevoir!
The hardest part of removing the clutch master cylinder is removing the cotter pin from the clutch pedal. There is a pin and connects the clutch master cylinder piston to the clutch pedal itself. The cotter pin a pretty soft, so you should be able to use your fingers and bend the cotter pin straight. Then using a 90 degree pick to grab the end of the cotter pin and tug the cotter pin out of the hole.
Now you can remove the two 12mm nuts that hold the clutch master cylinder to the firewall. Once the two nuts are removed, you can pull the clutch master cylinder out of the car from under the hood.
With the old clutch master cylinder removed, make sure you transfer the gasket to the new clutch master cylinder along with the clutch fluid resevoir. You can now reinstall the new clutch master cylinder.
To remove the clutch slave cylinder, first disconnect the clutch line from the slave cylinder itself by removing the two 10mm bolts that hold the gold flange to the clutch slave cylinder body. Once the clutch line is disconnected, go ahead and remove the two 12mm bolts holding the clutch slave cylinder to the gearbox. You can see the clutch slave cylinder bolts in the second picture on the left. Reinstall the new clutch slave cylinder to the gearbox and reconnect the clutch line.
Once everything is buttoned up on the clutch master and slave cylinder, you will need to bleed the clutch system. Top off the clutch fluid resevoir with DOT brake fluid (DOT 3 or better is recommended). Then attach a simple vacuum line and bottle to the bleed nipple on the clutch slave cylinder to catch the fluid.
Using a 10mm wrench, have a partner pump the clutch pedal a few times and hold it down, then loosen the bleed nipple to let the air out and then immediately tighten the bleed screw again. Your partner make have to pump the clutch pedal by hand the first few times until the system can build up some pressure at which point he can then pump using his foot. Repeat the pump -> hold -> bleed process until no bubbles can be seen in the bleed bottle. Be sure to check the clutch fluid resevoir between pumping so it doesn't run dry. Once you have finished bleeding the system, top off the clutch fluid resevoir to the FULL line indicated on the resevoir.




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