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can missing brake fluid cap cause problems?

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Old 03-31-2005, 02:11 AM
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Dan Gallagher
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Default can missing brake fluid cap cause problems?

i believe the brake fluid reservoir cap was removed from my car about 8 months ago before the car was parked outdoors including a new york winter and partial summer.... will the missing cap have caused any damage other than needing a fluid flush? will things have dried out and broken?

dont have the car infront of me so all im looking for is if problems are possible because i haveto request new parts (cap at a minimum) from the people that removed the part for me!
Old 03-31-2005, 02:24 AM
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Gator_86_951
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I can't really think of anything. You just want to purge all that fluid out. It likely absorbed a lot of water during that time. Water is no good for brake fluid, as you already know.
Old 03-31-2005, 02:51 AM
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Serge944
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It wouldn't be a smart idea. The air could get humid, and as gator mentioned, BF is hygroscopic.
Old 03-31-2005, 02:55 AM
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Dude, I was totally trying to think of that word. Serge 1, Gator 0. And to think i am an engineer too...
Old 03-31-2005, 03:28 AM
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Have the fluid saved so it can be looked at. You may have internal rust problems now. And look at how much black residue is on the bottom of the reservoir. Brake fluid sucks up moisture like a vampire. If your master cylinder seals fail in awhile you can bet the rust formed on the pistons and chewed up the seals.

You could have also passed that water into the lines and have them rusting from the inside out. My father had a line rust from the inside out because while he had a reservoir cap, he never changed the brake fluid for 12 years.
Old 03-31-2005, 04:24 AM
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Originally Posted by Gator_86_951
Dude, I was totally trying to think of that word. Serge 1, Gator 0. And to think i am an engineer too...
I'm an engineer in training. It's fresh material for me.
Old 03-31-2005, 04:33 AM
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Originally Posted by IceShark
Have the fluid saved so it can be looked at. You may have internal rust problems now. And look at how much black residue is on the bottom of the reservoir. Brake fluid sucks up moisture like a vampire. If your master cylinder seals fail in awhile you can bet the rust formed on the pistons and chewed up the seals.

You could have also passed that water into the lines and have them rusting from the inside out. My father had a line rust from the inside out because while he had a reservoir cap, he never changed the brake fluid for 12 years.
Agreed. Your biggest possible problem will be moisture & rust inside the lines and pistons.



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