S2000 Under The Hood S2000 Technical and Mechanical discussions.

Master cyl replace or fix?

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Old 03-03-2010, 06:11 AM
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Originally Posted by Saki GT,Mar 3 2010, 06:51 AM
I think after time, the seals just corrode. The OP has a 00 s, you have an 01, and from what I've read here, CMCs can go bad in as little as three years.

Fwiw, I just replaced mine at 6 yrs old. I first flushed the fluid, but it was still leaking, with black build up at the plunger, which I took to be disintegrating rubber mixed with brake fluid. Ymmv.
Yes, mine has the black fluid at the plunger. Now, if it's disintegrating rubber from the system a fluid change doesn't seem like it will take care of it at this point...

So, it sounds like with a 10 year old 160k mile car with black residue in the plunger I should go for a new one at this point (master cyl).
Old 03-03-2010, 10:05 PM
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mate just had the same thing 2 i had replaced my clutch and flywheel a week earlier the extra pressure from the aftermarket clutch must have blown the already weak seal in the master the pedal went sloppy as i just replaced both the master and slave the guys at my honda dealership said usually when the master goes the slave usually follows so u might want to think about changing both
Old 03-04-2010, 06:51 AM
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how would u kno if the slave cylinder is going also?
Old 03-04-2010, 08:04 AM
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^Look for leaks around the rubber dust boot.
Old 03-04-2010, 01:02 PM
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Originally Posted by nv_blitz,Mar 3 2010, 01:14 AM
pick up an omni power one, its an upgrade over the stock makes the clutch feel better and allows for quicker shifts
the omni quick MC is a pos

i dont know why people still buy from a company that have
terrible product failure record.

remember the omni full coilover? the lower machined mount(the one
that connect your shock to the control arm) snaps in half
Old 03-04-2010, 01:12 PM
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when my first maste cyl went, i replaced both at the same time, master and slave so i dont have to worry about the slave going. i got both for 150.oo.
Old 03-04-2010, 09:36 PM
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Originally Posted by turbo_slug,Mar 3 2010, 02:27 AM
please explain why you think it feels better...
Maybe i'm lucky then, I have not had any problem with omni products in the past or present. Had the coil overs and the clutch master cylinder on my GSR for over 6 years no problems, the car was tracked often as well. On my S I have the clutch master cylinder, so far so good.

I think clutch feel is a matter of preference, with the omni pedal feel is much stiffer and clutch engagement is much sooner than stock.
Old 03-04-2010, 10:04 PM
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I'm looking into a rebuilt master cyl
Old 03-04-2010, 10:14 PM
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I called OMNI last year regarding their master cylinder. They said they no longer sell them as so many of them were breaking, therefore I wouldn't recommend it.
Old 03-04-2010, 11:05 PM
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how hard would it be to replace this on your own?... im thinking of replacing mine since im at 110k miles already on my s2k


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