S2000 Under The Hood S2000 Technical and Mechanical discussions.

Clutch Master Cylinder going bad

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Old Dec 9, 2010 | 06:57 PM
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Default Clutch Master Cylinder going bad

Hello,

I have a MY02 S2000 and it has ~57k miles. I noticed that the clutch pedal feels softer when I press it in. Does anyone know why this happened. Could it be the way the drive? Or is it due to the age of the car? My brother had the same problem with his car about a week ago. He got the clutch master cylinder replaced.

Thanks
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Old Dec 9, 2010 | 07:08 PM
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Its a common problem on the S2000 for some reason. Change your master and your slave at the same time, make sure you flush out the lines properly too!
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Old Dec 9, 2010 | 07:13 PM
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I have a clutch master cylinder for sale if you need it
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Old Dec 10, 2010 | 05:32 AM
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Clutch master is not the problem. the problem is there is no service interval for the fluid, and 95% of s2k cmc's leak because of it.

If your clutch pedal feels softer, check the fluid. If the level is ok, then it's your slave end and fork that need greasing. The pedal will go randomly from easy to hard, depending on where the fork is touching the bearing. Grease will cure it.
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Old Dec 10, 2010 | 07:14 AM
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Originally Posted by Billman250,Dec 10 2010, 09:32 AM
Clutch master is not the problem. the problem is there is no service interval for the fluid, and 95% of s2k cmc's leak because of it.

If your clutch pedal feels softer, check the fluid. If the level is ok, then it's your slave end and fork that need greasing. The pedal will go randomly from easy to hard, depending on where the fork is touching the bearing. Grease will cure it.
if you wanted to grease the fork prongs in the transmission, is there a better method than the coat hanger? Is there a special tool of some sort maybe?
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Old Dec 10, 2010 | 07:33 AM
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I checked the clutch fluid and it's below the min line. If I just add dot 3 brake fluid do I still need to replace the master cylinder?
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Old Dec 10, 2010 | 10:19 AM
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Flush and bleed. Just topping it off won't help. If that doesn't do it then start figuring out what part is bad.
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Old Dec 10, 2010 | 10:45 AM
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Originally Posted by DangerZone9K,Dec 10 2010, 11:33 AM
I checked the clutch fluid and it's below the min line. If I just add dot 3 brake fluid do I still need to replace the master cylinder?
Add fluid and report back. Maybe look at the firewall to see if there is a possible leak.
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Old Dec 10, 2010 | 08:30 PM
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Originally Posted by ikeyballz,Dec 9 2010, 08:08 PM
Its a common problem on the S2000 for some reason.
Not true and I agree with billman's comment.

MY01 has 150K miles and I still have the original master and slave cylinders. Common problem is for the Master to start leaking fluid out of the piston attached to the pedal but VERY VERY slowly and gets worse over time. But even that doesn't start until maybe close to 100K miles or so.

Good thing is that there is a DIY here for both master and slave replacement if need be and its not that hard to do.
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Old Dec 12, 2010 | 07:39 AM
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Originally Posted by Billman250,Dec 10 2010, 06:32 AM
Clutch master is not the problem. the problem is there is no service interval for the fluid, and 95% of s2k cmc's leak because of it.

If your clutch pedal feels softer, check the fluid. If the level is ok, then it's your slave end and fork that need greasing. The pedal will go randomly from easy to hard, depending on where the fork is touching the bearing. Grease will cure it.
Billman, I think you are the man! But I have to check on Monday. My pedal went down suddenly last week. Overnight. Slightly low on fluid. About 20mls. Added some. Over a few days the pedal has come back up to completely normal. Tomorrow I'm gonna check how lubed it is. Geez, do you know any S2k mechanics as good as you in the SoCal area? South of LA?

Mines an 03, 115,000 miles. Original clutch and cylinders. Mostly freeway miles.
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