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Old 05-14-2018, 02:38 PM   #1
eddyy
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Join Date: Feb 2016
Drives: 2013 FR-S
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Garage
Broken Clutch Master Cylinder

I tried searching but didn't find anyone else that posted about this issue.

When I pulled my car out of the driveway I pressed the clutch down and heard a loud "pop". Immediately after hearing the noise I lost all pressure on the clutch pedal. It just moved back and forth freely with no resistance either way.

After calling into work and having my girlfriend help me push my car back up my driveway I noticed I had no fluid in the clutch master cylinder reservoir so I filled it back up to the "max" line. I regained pressure on the clutch but lost it again after only a few pumps of the pedal. That's when I noticed a puddle of fluid on the top of my transmission. So I added only a little more fluid into the reservoir and had my girlfriend pump it a few times while I looked at the area.

Sure enough a geiser of brake fluid would spew out from underneath the master cylinder. So I took it apart but didn't find any obvious signs of damage. The black o-ring was fine, there was no corrosion, and the ring lock was securely in place. It was only when I was cleaning the parts to reassemble it that I noticed the metal disk that is sandwiched between the o-ring, a metal washer had a crack on it.

I could not find this disk for sale anywhere on the internet, I even called my local dealer to find a part number for it but they only sell the clutch master cylinder as a unit.

How could a metal disk like this just crack under normal use? Have any of you had a similar failure?

Due to this 60 cent piece of steel I now have to pay $160 to get a new one sent to me... FML

*note I colored the steel with dye to make the crack visible.


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