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E36/7 Z3 (1996-2002)
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  #1  
Old 05-07-2004, 08:13 AM
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killeen_john killeen_john is offline
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What happens if you over fill the brake resevoir?

A coworker here recently borrowed my Motive Pressure bleeder and after driving for a day noticed that brake fluid had spilled out of the resevoir. I thought maybe he was just messy but, when I looked under the hood of his car (E36 M3) I noticed that the brake level sensor electrical connection had brake fluid all over and in it. I cleaned it up with electrical parts cleaner, but I'm trying to understand what happened. If he over filled the resevoir (as the Power Bleeder can do if you don't remove the excess fluid over the max mark) will the fluid leak through the sensor connection? The fluid level looked to be a little high, but probably just level or slightly above the max mark. On my car, the fluid level is probably 1 cm below the max mark. I removed some of his fluid with a turkey baster to be about the same, but I am still trying to understand what happened. The resevoir and electrical connector looked to be the same as on my car.
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  #2  
Old 05-07-2004, 08:47 AM
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Ron Stygar Ron Stygar is offline
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Quote:
Originally Posted by killeen_john
A coworker here recently borrowed my Motive Pressure bleeder and after driving for a day noticed that brake fluid had spilled out of the resevoir. I thought maybe he was just messy but, when I looked under the hood of his car (E36 M3) I noticed that the brake level sensor electrical connection had brake fluid all over and in it. I cleaned it up with electrical parts cleaner, but I'm trying to understand what happened. If he over filled the resevoir (as the Power Bleeder can do if you don't remove the excess fluid over the max mark) will the fluid leak through the sensor connection? The fluid level looked to be a little high, but probably just level or slightly above the max mark. On my car, the fluid level is probably 1 cm below the max mark. I removed some of his fluid with a turkey baster to be about the same, but I am still trying to understand what happened. The resevoir and electrical connector looked to be the same as on my car.
It's a vented system.
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  #3  
Old 05-07-2004, 08:53 AM
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killeen_john killeen_john is offline
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Quote:
Originally Posted by Ron Stygar
It's a vented system.

Is it vented through that electrical connector? It just seemed odd to me that fluid would end up in the connector.

So, I assume that his brake resevoir forced out the fluid that was over the max level mark.
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  #4  
Old 05-07-2004, 09:24 AM
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Is the cap vented just like the one on the power steering reservoir? I might be really wrong on this, Ron will know.

I assume the cause of the "leak" is that he did not remove the excess and left it filled to the very top? A little bit above the MAX line isn't going to make a difference but leaving it "topped off" (in a manner of speaking) will. I suppose it's just a matter of the least path of resistence and the mechanism is constant immersion.
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