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Old 06-20-2017, 11:39 AM   #85
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Quote:
Originally Posted by cdb95z28 View Post
To summarize:
-The slit is there for pressure release, and it should not be blocked. If you use the mentioned spacer, you may cause other issues.
-The wetness observed is from fluid seeping thru the slit upon a pressure release.
-This is normal. Do not overfill your reservoir.
-The reservoir is not leaking at the seam.
-The Dorman diaphram has the slit. If you drive the car hard enough over a sustained period of time, you will most likely find fluid outside the reservoir.
-If you insist on installing a spacer, open up the center so the slit will function, but you will still get some fluid outside the reservoir.
-Really, what is the big fuss over a little spilled brake fluid? It is not flowing like a flood.
"-The slit is there for pressure release, and it should not be blocked. If you use the mentioned spacer, you may cause other issues."

NOT SO!! that slit will let water moster and air in and you do not want that. The diaphragm is made to come down as the brake pads wear. if you look on most cars as you change the worn brake pads you will see the diaphragm has to be put back into the cap because it moves down. that is why you have a diaphragm. If air gets to brake fluid it takes on moister and goes bad and boils. The hole is like a last resort if the diaphragm does not come down. If the hole lets air in then why have a diaphragm? Yes brake fluid eats the paint of the back fire wall if too much gets down and out.

Last edited by Skylane765; 06-20-2017 at 11:49 AM.
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Old 06-20-2017, 10:10 PM   #86
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Quote:
Originally Posted by Skylane765 View Post
The slit should not be in the diaphragm at all, because it will leak and let air and moister in. The diaphragm is to take up the space of the fluid when the brake pads wear.
The slit is part of it. A google search will show the that the slit is engineered into it, design to equalize a pressure differential. I must've checked a dozen vehicles, even a Kabota Mule and they all had the slit. The slit is designed to be "normally closed", but will relieve upon "preselected conditions" as one patent put it, and as you mentioned, as a last resort. Yes the diaphragm is also designed to expand to compensate for the displaced fluid due to wear. But it will not completely compensate for the maximum displaced volume.
I keep the level just below the full mark, and have had no issues. No seepage. I track my car so , yes, it gets run hard. I also have a separate clutch reservoir, with a Dorman diaphragm and have not had any stuck pedal issues.
I guess I look over things maybe more than some owners. I can understand some owners may not open their hood for months, so if there is seepage, it goes undetected for a long time and if it finds its way to the paint yeah, it gets ugly.
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Last edited by cdb95z28; 06-20-2017 at 10:18 PM. Reason: Grammar!
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Old 02-21-2018, 12:42 PM   #87
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I am the third owner of my 2011 SS.

Noticed the weeping on the day I bought it last summer (2017).

Honestly didn't scrutinze the area below until just recently.

Pic below is the condition of the paint below my reservoir today.

I realize the cows already got out of the barn, but it still bugs me to see brake fluild oozing around the resevoir cap. I'll give the Advance Auto / Dorman rubber seal replacement a try.
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Old 02-21-2018, 01:14 PM   #88
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The seal is much thicker from dorman, seals well...

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

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Old 02-27-2018, 10:32 AM   #89
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I replaced just the seal with the Dorman seal today.
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Old 02-27-2018, 10:38 AM   #90
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The used OEM seal I removed from the 2011 SS is slightly wider than the new Dorman seal.
1.868 OEM
1.832 Dorman


The new Dorman seal is 68% thicker than the used OEM seal.
0.088 OEM
0.148 Dorman

I bought a replacement cap, but have not yet used it. I would prefer to use the OEM cap with the Dorman seal if that works OK.

The pic above shows the Dorman seal installed on the OEM cap.
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Old 02-27-2018, 10:45 AM   #91
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I will also note that there does not appear to be any "vent" hole in the Dorman seal.
I looked at it closely in bright light. If there is a vent hole, I cannot see it.

The OEM seal has a vent hole in the center.

Interested in opinions on this vent-hole issue.
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Old 02-27-2018, 10:47 AM   #92
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The spacer works great, then you can keep the OEM design gasket in there. My paint was damaged below the reservoir from this problem, definitely check yours ASAP.
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Old 02-27-2018, 10:49 AM   #93
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Quote:
Originally Posted by 2thousand2 View Post
The spacer works great, then you can keep the OEM design gasket in there. My paint was damaged below the reservoir from this problem, definitely check yours ASAP.
The paint below my reservoir is already absolutely trashed.

See red circle in post several above.
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Old 02-27-2018, 10:53 AM   #94
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My question is: What can really happen if there is no vent in the Dorman seal?

This whole thing still seems to seal so weakly anyway, I suspect that if the reservoir needs to draw air, the system will still draw it around the Dorman seal.

The new Dorman seal makes it snug. Does not impress me as 100% airtight.

I suppose if it were 100% airtight, it would create a vacuum on the hydraulic system as the brake pads wear. Eventually, air would get in somewhere. Hopefully the air would enter at the reservoir - as opposed to entering elsewhere in the system.

Maybe if you are driving in such a manner that you are eating brake material at an exponentially high rate, you might want to "burp" your brake cylinder reservoir to mitigate any wear-induced vacuum issues. Of course, if you are chewing up brakes at that rate, you might also want to add some brake fluid too while you are burping the system.
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Old 02-27-2018, 12:30 PM   #95
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Old 02-27-2018, 03:10 PM   #96
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Quote:
Originally Posted by W.E.G. View Post
I will also note that there does not appear to be any "vent" hole in the Dorman seal.
I looked at it closely in bright light. If there is a vent hole, I cannot see it.

The OEM seal has a vent hole in the center.

Interested in opinions on this vent-hole issue.
Did you try squeezing the seal, it might show up, just like one of my pics above.
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Old 02-27-2018, 09:38 PM   #97
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Quote:
Originally Posted by cdb95z28 View Post
Did you try squeezing the seal, it might show up, just like one of my pics above.
I did that and more.

I SCRUTINIZED it.

Aint no visible hole anywhere in that thing.

The slit in the OEM seal was patent.
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Old 10-16-2019, 12:34 PM   #98
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So my brake/clutch fluid cap just started to leak on my 13' ZL1 (34k miles). I decided to purchase the HELP #42072 gasket. It is for sure a thicker gasket, and snugs the cap on tight. For those of you who have it installed, have there been any issues with it since it does not contain the small slit like the factory gasket? My car is mainly street driven so I don't foresee any issues, but I'd like to make sure.
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