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Master Cylinder popped

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Old Nov 30, 2012 | 06:58 AM
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Master Cylinder popped

Finally happened. Just put in a new clutch about 2k miles ago. (Spec Stage 2+) I didn't feel that the clutch pedal was any stiffer, but it was just a matter of time.

2008 GSR. 55k miles. 2k miles on new clutch.

Now it's back to shopping for more parts.
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Old Nov 30, 2012 | 07:03 AM
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Originally Posted by Finest
Finally happened. Just put in a new clutch about 2k miles ago. (Spec Stage 2+) I didn't feel that the clutch pedal was any stiffer, but it was just a matter of time.

2008 GSR. 55k miles. 2k miles on new clutch.

Now it's back to shopping for more parts.
Damn i have a 2011 GSR with ACT 6 puck clutch and on OEM CMC for about 2000 miles. Lets hope she holds. What was the outside temperature where you're at. I heard colder temps tend to make it weaker
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Old Nov 30, 2012 | 07:07 AM
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Originally Posted by superk1980
What was the outside temperature where you're at.
His location is Wisconsin..... Assuming it was recently do the math. We had mid 30's yesterday here in Michigan.
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Old Nov 30, 2012 | 07:34 AM
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Originally Posted by superk1980
Damn i have a 2011 GSR with ACT 6 puck clutch and on OEM CMC for about 2000 miles. Lets hope she holds. What was the outside temperature where you're at. I heard colder temps tend to make it weaker
From what I read, the 08's have it the worst in terms of master cylinders. Someone verify, but I think the '11s should hold up better?

It was probably around low 40's this morning, pretty mild weather relatively for this time of the year. Luckily I had enough momentum to carry me through the stoplight and around a corner into a parking lot. I was slowing down into the turn at a stoplight, pushed in the clutch and I felt it drop to the floor.
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Old Nov 30, 2012 | 08:02 AM
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Damn that really sucks but on the bright side once you upgrade it you wont be like me worrying when my clutch pedal wont come back up from the floor
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Old Nov 30, 2012 | 08:11 AM
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Probably going to go with the Magnus MC upgrade.

I notice that on the MAP website they use an OEM replacement EVO 8/9 MC and not an actual OEM one for the Magnus kit. The option for the OEM MC is another $25 more, not a big deal. Has anyone has experience using the OEM replacement MC instead of the actual OEM one? The good news is that they're both not plastic.
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Old Nov 30, 2012 | 08:59 AM
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Originally Posted by Finest
Probably going to go with the Magnus MC upgrade.

I notice that on the MAP website they use an OEM replacement EVO 8/9 MC and not an actual OEM one for the Magnus kit. The option for the OEM MC is another $25 more, not a big deal. Has anyone has experience using the OEM replacement MC instead of the actual OEM one? The good news is that they're both not plastic.
If you search, I believe their was a thread or 2 on the knock off MC and failing. I would just go with OEM.
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Old Nov 30, 2012 | 09:06 AM
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Originally Posted by AWDTerror
If you search, I believe their was a thread or 2 on the knock off MC and failing. I would just go with OEM.
EEEEKS!

Yea, OEM all the way.
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Old Nov 30, 2012 | 09:31 AM
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Oh and I've ran the Magnus since it was released, as with any, just plan on spending a lot of time bent in awkward positions over the front of the car. To limit that amount of time, get a proper and working air grinder and a proper grinding bit. My grinder died and I was forced to resort to a dremel and cutoff wheels.

Also be very very careful with the o-ring inside the brake master cyl.
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Old Nov 30, 2012 | 12:02 PM
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Originally Posted by AWDTerror
Oh and I've ran the Magnus since it was released, as with any, just plan on spending a lot of time bent in awkward positions over the front of the car. To limit that amount of time, get a proper and working air grinder and a proper grinding bit. My grinder died and I was forced to resort to a dremel and cutoff wheels.

Also be very very careful with the o-ring inside the brake master cyl.
Hmmm, so there is some grinding needed to get it to fit? That might change my mind now.

I was hoping for a R&R (remove and replace) job.
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Old Nov 30, 2012 | 12:38 PM
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We also have ours in stock ready to go and it offers plenty of clutch pedal adjustment:



Click here

Please shoot me a PM if you are interested.
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Old Nov 30, 2012 | 03:42 PM
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I would also go to an oem one. There is just something wrong with grinding the firewall and exposing metal to get a aftermarket CMC and there has been to many threads of issues with the other CMC That screws in. I've always wondered if I went to a push style clutch if that would work with the factory CMC.
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Old Nov 30, 2012 | 03:51 PM
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the x's plastic MC is known to do this.
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Old Dec 3, 2012 | 09:56 AM
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Originally Posted by Finest
Hmmm, so there is some grinding needed to get it to fit? That might change my mind now.

I was hoping for a R&R (remove and replace) job.
It's just tedious. All your doing is grinding off 2 studs that hold the clutch pedal to the firewall and replacing them with bolts supplied in the magnus kit. AMS as shown above makes use of studs already installed in the adapter plate.

And any CMC kit, including the factory style one you still have to remove the brake master cyl and everything to get to it.
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Old Dec 3, 2012 | 12:42 PM
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Originally Posted by superk1980
Damn i have a 2011 GSR with ACT 6 puck clutch and on OEM CMC for about 2000 miles. Lets hope she holds. What was the outside temperature where you're at. I heard colder temps tend to make it weaker

Super, i hope you have a cmc replacement. i had 5k miles on my oem cmc with my 6 puck before it popped. it is not a matter of if, but when.
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