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Using saved Brake Fluid #4727550
04/15/18 09:32 AM
04/15/18 09:32 AM
Joined: Sep 2005
Posts: 522
Indiana
Touring5 Offline OP
Touring5  Offline OP
Joined: Sep 2005
Posts: 522
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.



FIRST LAW OF DEBATE
Never argue with a fool - people might
not know the difference.
Re: Using saved Brake Fluid [Re: Touring5] #4727569
04/15/18 09:49 AM
04/15/18 09:49 AM
Joined: Sep 2012
Posts: 5,408
DFW
DBMaster Offline
DBMaster  Offline
Joined: Sep 2012
Posts: 5,408
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

Re: Using saved Brake Fluid [Re: DBMaster] #4727571
04/15/18 09:52 AM
04/15/18 09:52 AM
Joined: Jul 2013
Posts: 2,235
Outer Banks, NC
NormanBuntz Offline
NormanBuntz  Offline
Joined: Jul 2013
Posts: 2,235
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.


2017 Honda Odyssey SE, 16K
2013 Honda Accord LX, 58K
2007 Honda Ridgeline RTS, 88K
2007 Infiniti M35, 107K
Re: Using saved Brake Fluid [Re: Touring5] #4727577
04/15/18 09:57 AM
04/15/18 09:57 AM
Joined: Dec 2017
Posts: 2,523
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,523
SE British Columbia, Canada
+2 Use it up.


If you want the job done right......do it yourself.
Re: Using saved Brake Fluid [Re: Touring5] #4727581
04/15/18 09:58 AM
04/15/18 09:58 AM
Joined: Jan 2011
Posts: 1,045
Columbus Nebraska
old1 Offline
old1  Offline
Joined: Jan 2011
Posts: 1,045
Columbus Nebraska
+3 +++


2017 Nissan Frontier 4.0 5w30
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
Re: Using saved Brake Fluid [Re: Touring5] #4727594
04/15/18 10:06 AM
04/15/18 10:06 AM
Joined: Sep 2005
Posts: 522
Indiana
Touring5 Offline OP
Touring5  Offline OP
Joined: Sep 2005
Posts: 522
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.
Re: Using saved Brake Fluid [Re: Touring5] #4727615
04/15/18 10:25 AM
04/15/18 10:25 AM
Joined: Jun 2003
Posts: 33,287
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,287
ME
It's fine.

Re: Using saved Brake Fluid [Re: Touring5] #4727625
04/15/18 10:34 AM
04/15/18 10:34 AM
Joined: Oct 2014
Posts: 1,282
NoVA
Jimzz Offline
Jimzz  Offline
Joined: Oct 2014
Posts: 1,282
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.


yup
Re: Using saved Brake Fluid [Re: Touring5] #4727658
04/15/18 11:01 AM
04/15/18 11:01 AM
Joined: Mar 2008
Posts: 7,027
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 7,027
USA
ATE comes in a metal can, so it is fine smile

The issue is with plastic bottles crzy

Re: Using saved Brake Fluid [Re: Touring5] #4727690
04/15/18 11:28 AM
04/15/18 11:28 AM
Joined: Aug 2008
Posts: 3,221
Where the wind comes sweepin'
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,221
Where the wind comes sweepin'
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?

Re: Using saved Brake Fluid [Re: Touring5] #4727770
04/15/18 12:39 PM
04/15/18 12:39 PM
Joined: May 2014
Posts: 3,723
Columbus,Nebraska
Yah-Tah-Hey Offline
Yah-Tah-Hey  Offline
Joined: May 2014
Posts: 3,723
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

Re: Using saved Brake Fluid [Re: Reddy45] #4727779
04/15/18 12:44 PM
04/15/18 12:44 PM
Joined: Nov 2017
Posts: 146
Winnipeg
Uphill_Both_Ways Offline
Uphill_Both_Ways  Offline
Joined: Nov 2017
Posts: 146
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. . . .


2008 Impala 3.5
Re: Using saved Brake Fluid [Re: Touring5] #4727841
04/15/18 02:00 PM
04/15/18 02:00 PM
Joined: Aug 2008
Posts: 3,221
Where the wind comes sweepin'
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,221
Where the wind comes sweepin'
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?

Re: Using saved Brake Fluid [Re: Touring5] #4727900
04/15/18 03:13 PM
04/15/18 03:13 PM
Joined: Jan 2016
Posts: 321
Cheshire, England
barryh Offline
barryh  Offline
Joined: Jan 2016
Posts: 321
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.


Barry

1979 BMW R45 (Triple QX 5W40)
2009 Mercedes C180K (Shell Helix Ultra 5W40)
Re: Using saved Brake Fluid [Re: Yah-Tah-Hey] #4727914
04/15/18 03:33 PM
04/15/18 03:33 PM
Joined: Sep 2005
Posts: 5,782
MIchigan
Warstud Offline
Warstud  Offline
Joined: Sep 2005
Posts: 5,782
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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