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Old 01-07-2014, 12:12 AM   #1
Stollmeyera
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Join Date: Aug 2012
Chapter/Region: SCIC
Location: SLO, CA
Vehicle:
2011 Impreza WRX
Lightning Red

Default Clutch master cylinder major leak...

Own a 2011 WRX sedan. Was driving home tonight and all of the sudden had my clutch pedal stick the floor. Was able to lift it back up with force, but the clutch would not engage after that. At first I was thinking it was just the slave cylinder failing, but after a closer look it was a major leak in the clutch master cylinder. Had a friend press the clutch down while I took a peek and saw a major amount of fluid leak NOT from any hoses or connections, but from the bottom of the master cylinder where no connections even exist.

I scowered Google and wasn't able to find anyone else with this exact issue. Not being too familiar with the way the master cylinder is built, I have no clue if there is a seal down there or if it may be a crack of some sort. Any one have any ideas if this is a common issue? Or even better, can it be easily fixed without giving it to the dealer for a week?

Much appreciation in advance!
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Old 01-07-2014, 09:18 AM   #2
JonnyV2889
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2006 WRX Ltd
OBP

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Are you not under warranty?
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Old 01-07-2014, 11:47 AM   #3
Stollmeyera
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Quote:
Originally Posted by JonnyV2889 View Post
Are you not under warranty?
Luckily I am...would way rather not give my car up for a week and drop $100 on a tow truck. On my way over to the dealership in the tow truck now tho.
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Old 01-07-2014, 12:40 PM   #4
JonnyV2889
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OBP

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Quote:
Originally Posted by Stollmeyera View Post

Luckily I am...would way rather not give my car up for a week and drop $100 on a tow truck. On my way over to the dealership in the tow truck now tho.
If it takes them a week to diagnosis/change a mc I'd find a new dealer.
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Old 03-17-2014, 02:44 PM   #5
Silver-Surfer08
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i just had the same exact thing happen to my 2008 Sti. I got in the car this morning to drive it to work and the clutch pedal just went strait to the floor and stuck there. I took a vid of what the clutch master cylinder did when i pumped the clutch and fluid just came pouring out the bottom. I am not sure what could've caused this to happen. What did the dealer end up saying about it? Has anyone else had this happen?
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Old 03-17-2014, 03:02 PM   #6
Kuros
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Red

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I know exactly what this problem is. I experienced the same thing in my 11 sti. One of the plates in the USELESS, stupid "damper" on the bottom of the master cylinder cracks/breaks apart and the pressure from the clutch forces the fluid through. I actually have pictures of everything.

You need a new master, or you'll have to machine a replacement part. (i did both)
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Old 03-17-2014, 03:33 PM   #7
bottles
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Were you guys having trouble grabbing gears leading up to this? Im having a similar problem no leaks or anything just hard to grab 3rd and 4th gear. I
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Old 03-17-2014, 03:36 PM   #8
Silver-Surfer08
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Nope. i drove the car yesterday just fine. I took a video of the under side of the clutch master cylinder and there's a snap pin in there that appears to be rusted.

Kuros, can i see the pictures? could i just used some sealant on it and just fill it in?
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Old 03-17-2014, 05:35 PM   #9
Kuros
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No, sealant wont help anything. The amount of pressure running through there is huge. Its enough to snap hardened steel plate.
There is a hardened steel piece in there that is broken, and the only way to get a new one is, unfortunately, a whole new clutch master.

Ill get some pics up soon.
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Old 03-17-2014, 05:50 PM   #10
Kuros
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Pics







You can see the broken piece



I machined an aluminium piece to drive around until my new master cylinder came.
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Old 06-25-2014, 05:19 PM   #11
bikerboy
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2009 SWP Spec B

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Bump this back to the top. Had the same thing happen to a customer car. Pulled all the guts and reservoir off of the mast body and welded the hole shut.
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Old 07-21-2014, 09:17 PM   #12
ForsaknFrntman
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Location: Centreville, VA
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WRB

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Bump again for this BS happening again. My master cylinder crapped out at a stop light this afternoon! Anyone know of a better part than the OEM one? Is welding it really the only way to solve the problem permanently?
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