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unopened/sealed can of brake fluid what is the self life, dot 4

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Old Mar 2, 2003 | 12:25 AM
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From: jeff NY usa
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unopened/sealed can of brake fluid what is the self life, dot 4

I have 2 cans of dot 4 that I brought for my car about 2 maybe 3 years ago,which I misplaced so I brought 2 more, I want to change my brake fluid in my car and was wondering if I could use it or if I should throw it out. Thanks
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Old Mar 2, 2003 | 01:49 AM
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Its fine, brake fluid in some cars have been known to be in there 30 years without changing.
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Old Mar 2, 2003 | 06:32 AM
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ede's Avatar
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in a plastic bottle, forever. if it were in an older metal bottle i'd trash it.
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Old Mar 2, 2003 | 03:57 PM
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Actually, I have heard quite the opposite. The canned brake fluid lasts indefinitely. The plastic will allow moisture to seep through over a period of time.
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Old Mar 2, 2003 | 08:09 PM
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'Course, we're talking, what, $10? If you don't feel safe using it, just buy new...
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Old Mar 5, 2003 | 05:06 AM
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'Course, he could be talkin' Castrol SRF and then we're talking, what, $100?
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Old Mar 5, 2003 | 03:49 PM
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Originally posted by Lounge Lizard 6
Actually, I have heard quite the opposite. The canned brake fluid lasts indefinitely. The plastic will allow moisture to seep through over a period of time.
Same here. Fluid in a metal can will outlast fluid in a plastic bottle. Moisture can pass thru the plastic.
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Old Mar 6, 2003 | 09:45 AM
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From: jeff NY usa
Car: 86 Z28
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Axle/Gears: 9 BOLT 3.45 POSI
So plastci is safe to use after 2/3 years?
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Old Mar 6, 2003 | 10:01 AM
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From: Mostly in water off So. Cal
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Originally posted by BLACK Z
So plastci is safe to use after 2/3 years?
I would use it with out question.
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Old Mar 6, 2003 | 10:59 PM
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how the hell does water (moisture) seep through plastic.. i have never seen this happen in my entire life.
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Old Mar 7, 2003 | 09:58 AM
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i highly doubt you can see the process. can you see the moisture in the air, most of the time? with the exception of fog.
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Old Mar 8, 2003 | 12:47 AM
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From: Mostly in water off So. Cal
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Let me remind everyone what are Master cylinder fluid resevoirs are made of - Plastic. If its fine in the car- its fine in the bottle.
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Old Mar 8, 2003 | 08:24 AM
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I think the basic question started out if the fluid was still good after X number of years. Then we have migrated to brake fluid reservoirs being made of plastic. Good grief...

If you do a search of brake fluids some of the very expensive fluids come in plastic.

However, Baer and some other reputable brake experts make comment about the preference of canned fluid over the plastic bottled variety. I place credence in what they say because it is their business.

FWIW, I'm running Castrol LMA as we speak, and it comes in a 'plastic' bottle; but I haven't had it on a shelf in my hot/cold garage for 3 years either. If I know the plastic bottled fluid has not been subjected to temp and storage extremes I would feel confident in it.
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Old Mar 8, 2003 | 10:26 AM
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From: Mostly in water off So. Cal
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Originally posted by Lounge Lizard 6
I think the basic question started out if the fluid was still good after X number of years. Then we have migrated to brake fluid reservoirs being made of plastic. Good grief...
.
Well genius, I do recall you being the smart guy that claimed "the plastic will allow moisture to seep through over a period of time"- Yes it was you that caused this migration- and gained everyones respect in the process....Good grief...
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Old Mar 11, 2003 | 01:04 AM
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!!! W O W !!!

Open the bottle and look inside or pour a little out, if it is clear, use it, if it is cloudy toss it.
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Old Mar 11, 2003 | 04:06 PM
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This is simply meant as an FYI. Brakes are Baer's business and I tend to trust what they say. Others may have their own experience to draw from. I leave it for everyone to determine for themselves how valid they feel it is.

Straight form The Baer Brakes web site:
What kind of brake fluids do you recommend?
Baer Racing recommends one of two different brake fluids: either the Performance Friction Z-Rated fluid (for most applications), or the Castrol SRF (for extreme duty applications such as road race cars). The Performance Friction fluid is very good and comes packaged in a metal can. This is important, as plastic containers allow the fluid to absorb moisture from the air, essentially dropping it to its wet boiling point before ever being put in the car. The Castrol SRF is simply the best fluid we have ever used. It has extremely high boiling points, both wet and dry, and holds up well under the adverse conditions of road racing or other extreme duty.
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