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#4727550 - 04/15/18 09:32 AM Using saved Brake Fluid
Touring5 Offline


Registered: 09/24/05
Posts: 504
Loc: Indiana
I know that brake fluid absorbs moisture and we always want to use fresh fluid, but I have a situation that I'm curious about and would be interested in others' opinion.

A couple of years ago I flushed the brakes in one of my cars using ATE 200 fluid. I used one can and only about 15% of a second one. I screwed the cap on the second can tightly as soon as I poured out what I needed. I then put that can in a ziplock bag and then that into a second ziplock bag and have kept it in my basement for a couple of years (pretty constant temperature of 65 F and 50% humidity).

How much do you think the fluid has been "compromised". I know that PE ziplock bags are far from being totally impervious, but would two be effective in preventing any further moisture absorption in the closed can? Also, I now have some mylar ziplock bags at my disposal and wonder if using one of those would be more effective for future storage.

I don't have a huge problem with throwing out the saved brake fluid, but if it can be saved effectively I'd prefer to avoid waste.
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FIRST LAW OF DEBATE
Never argue with a fool - people might
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#4727569 - 04/15/18 09:49 AM Re: Using saved Brake Fluid [Re: Touring5]
DBMaster Offline


Registered: 09/18/12
Posts: 5273
Loc: DFW
I simply screw the cap back on and use it until it's gone. I never gave a second thought to whether or not it has absorbed moisture. Oh, the humanity! YMMV

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#4727571 - 04/15/18 09:52 AM Re: Using saved Brake Fluid [Re: DBMaster]
NormanBuntz Offline


Registered: 07/27/13
Posts: 2016
Loc: Outer Banks, NC
Originally Posted By: DBMaster
I simply screw the cap back on and use it until it's gone. I never gave a second thought to whether or not it has absorbed moisture. Oh, the humanity! YMMV


+1. Use it up.
_________________________
"What is it, the first hole I dug?"
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2013 Honda Accord LX
2007 Honda Ridgeline RTS
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#4727577 - 04/15/18 09:57 AM Re: Using saved Brake Fluid [Re: Touring5]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1278
Loc: Alberta
+2 Use it up.

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#4727581 - 04/15/18 09:58 AM Re: Using saved Brake Fluid [Re: Touring5]
old1 Offline


Registered: 01/04/11
Posts: 963
Loc: Columbus Nebraska
+3 +++
_________________________
2014 Fusion 2.5 engine 5/20 QSUD
1965 Mustang 200 c/4 10w30 QS defy
1964 Ford Ranchero 302 c/4 15/40 Delo
1929 ford model A No filters, and 15/40 oil

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#4727594 - 04/15/18 10:06 AM Re: Using saved Brake Fluid [Re: Touring5]
Touring5 Offline


Registered: 09/24/05
Posts: 504
Loc: Indiana
I think I'll do just that. I'll put the 'open' fluid in my secondary car and use new for my main vehicle (they're still old by most standards, LOL).
_________________________

FIRST LAW OF DEBATE
Never argue with a fool - people might
not know the difference.

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#4727615 - 04/15/18 10:25 AM Re: Using saved Brake Fluid [Re: Touring5]
eljefino Offline


Registered: 06/15/03
Posts: 32377
Loc: ME
It's fine.

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#4727625 - 04/15/18 10:34 AM Re: Using saved Brake Fluid [Re: Touring5]
Jimzz Offline


Registered: 10/03/14
Posts: 1103
Loc: NoVA
I do the same, put it in a freezer zip bag after sealing. I use it up like that for many decades now and never had an issue.
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yup

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#4727658 - 04/15/18 11:01 AM Re: Using saved Brake Fluid [Re: Touring5]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 5828
Loc: USA
ATE comes in a metal can, so it is fine smile

The issue is with plastic bottles crzy

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#4727690 - 04/15/18 11:28 AM Re: Using saved Brake Fluid [Re: Touring5]
Reddy45 Offline


Registered: 08/15/08
Posts: 2726
Loc: USA
On the same note, if you run the car at the track and do some heavy braking then that fluid is going to heat up. Will that cleanse the brake fluid of moisture?

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#4727770 - 04/15/18 12:39 PM Re: Using saved Brake Fluid [Re: Touring5]
Yah-Tah-Hey Offline


Registered: 05/26/14
Posts: 3215
Loc: Columbus,Nebraska
Have never found a place that will take brake fluid. Mention brake fluid at a hazardous material collection event and eyeballs roll around like you have the plague. sick

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#4727779 - 04/15/18 12:44 PM Re: Using saved Brake Fluid [Re: Reddy45]
Uphill_Both_Ways Offline


Registered: 11/06/17
Posts: 51
Loc: Winnipeg
Originally Posted By: Reddy45
On the same note, if you run the car at the track and do some heavy braking then that fluid is going to heat up. Will that cleanse the brake fluid of moisture?
No.
http://tiltonracing.com/brake-fluid-stay-safe-and-go-fast/
Quote:
When the brake fluid becomes saturated with water (3.7 percent by volume), that water can boil in the lines and produce steam (the gaseous form of water). Unlike a liquid, a gas is highly compressible. To some [sic] this up, when a compressible substance (steam) is introduced into a hydraulic system (the brakes), that system can no longer function and the pedal will likely go to the floor –not good! Replacing the fluid before it becomes saturated with water (which we will touch on later) is the key to maintaining the dry boiling point. . . .
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#4727841 - 04/15/18 02:00 PM Re: Using saved Brake Fluid [Re: Touring5]
Reddy45 Offline


Registered: 08/15/08
Posts: 2726
Loc: USA
I guess I should have framed my question as : If your brake fluid has picked up moisture, could you heat it up (like in a clean pot) and cook off the moisture and then use it again in the car?

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#4727900 - 04/15/18 03:13 PM Re: Using saved Brake Fluid [Re: Touring5]
barryh Offline


Registered: 01/09/16
Posts: 296
Loc: Cheshire, England
We are all happy to use fluid in a vented master cylinder reservoir for 2 years and in many cases much longer yet the fluid in a sealed can somehow deteriorates immediately on opening. That's a ridiculous notion, in a sealed can it has to last a lot longer than in does in the cars brake system.

The OP took good precautions and I think the fluid will be just fine. It could always be tested for moisture content if there was any concern.
_________________________
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1979 BMW R45 (Triple QX 5W40)
2009 Mercedes C180K (Shell Helix Ultra 5W40)

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#4727914 - 04/15/18 03:33 PM Re: Using saved Brake Fluid [Re: Yah-Tah-Hey]
Warstud Offline


Registered: 09/02/05
Posts: 5192
Loc: MIchigan
Originally Posted By: Yah-Tah-Hey
Have never found a place that will take brake fluid. Mention brake fluid at a hazardous material collection event and eyeballs roll around like you have the plague. sick


You can mix it in with your used oil,trans fluid, ps fluid and gear oil.

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