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#4585915 - 11/26/17 05:27 PM Break Fluid??!
miden851 Offline


Registered: 02/15/16
Posts: 433
Loc: GA
My old car calls for DOT 4; I was wondering how important is the replacement for you and how many of you keep up with maintenance of the fluid;

On the note, I replaced mine today after many, many miles, and little or if any difference in braking power IMO









Edited by miden851 (11/26/17 05:32 PM)
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2008 Mazda6i GT; @195K miles
2016 Honda CR-V EX-L; @29K miles

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#4585926 - 11/26/17 05:41 PM Re: Break Fluid??! [Re: miden851]
Ethan1 Offline


Registered: 12/29/14
Posts: 1632
Loc: 'murica
You can't break a fluid

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#4585928 - 11/26/17 05:43 PM Re: Break Fluid??! [Re: miden851]
THafeez Offline


Registered: 08/15/16
Posts: 651
Loc: New Jersey
My favorite fluid on breaks is water you should try it
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175,000 miles
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#4585935 - 11/26/17 05:48 PM Re: Break Fluid??! [Re: miden851]
philipp10 Offline


Registered: 05/09/14
Posts: 1184
Loc: Minnesota
I have been saying it for years (but no one will listen) that a well designed brake system will keep the fluid dry. Furthermore, even if water gets in the fluid, unless your in the mountains or towing, your not going to boil the fluid. I never bleed my brakes yet have never replaced a caliper. Go figure.

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#4585937 - 11/26/17 05:49 PM Re: Break Fluid??! [Re: miden851]
skyactiv Offline


Registered: 03/02/13
Posts: 4405
Loc: The Midwest

It's important and I keep up with replacement.

I was a mechanic at a Honda dealer eons ago before more education and eventually becoming a UPS semi mechanic.
Don't be disappointed your brakes don't feel better. I've worked on my share of vehicles where the brake fluid was never changed and caused expensive repairs.
Brake fluid accumulates moisture over time. Brake fluid is cheap. Replacing an ABS pump is not. Losing your brakes away from home is no fun either.
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#4585940 - 11/26/17 05:53 PM Re: Break Fluid??! [Re: miden851]
slacktide_bitog Online   content


Registered: 03/20/08
Posts: 6181
Loc: USA
I replace the brake fluid when replacing pads and rotors.

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#4585942 - 11/26/17 05:53 PM Re: Break Fluid??! [Re: philipp10]
skyactiv Offline


Registered: 03/02/13
Posts: 4405
Loc: The Midwest
Originally Posted By: philipp10
I have been saying it for years (but no one will listen) that a well designed brake system will keep the fluid dry. Furthermore, even if water gets in the fluid, unless your in the mountains or towing, your not going to boil the fluid. I never bleed my brakes yet have never replaced a caliper. Go figure.


Explain how brake fluid gets dark over time.
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#4585959 - 11/26/17 06:08 PM Re: Break Fluid??! [Re: philipp10]
E150GT Offline


Registered: 03/11/12
Posts: 1110
Loc: San Antonio, TX
Originally Posted By: philipp10
I have been saying it for years (but no one will listen) that a well designed brake system will keep the fluid dry. Furthermore, even if water gets in the fluid, unless your in the mountains or towing, your not going to boil the fluid. I never bleed my brakes yet have never replaced a caliper. Go figure.

If you keep your car for only a few years this is correct. Why change it? If you keep it for a long time, change it regularly. Your brake system corrodes from within and you canít see it and one day it will fail you. Mine did and luckily I was in a parking lot. I would have been in deep kimchi had I been on the highway.
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1984 Mercedes-Benz 300SD - 100k
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#4585961 - 11/26/17 06:09 PM Re: Break Fluid??! [Re: miden851]
Ducked Offline


Registered: 10/25/12
Posts: 4388
Loc: Taiwan
Old brake fluid can break brakes.


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#4585965 - 11/26/17 06:13 PM Re: Break Fluid??! [Re: miden851]
Warstud Online   content


Registered: 09/02/05
Posts: 5413
Loc: MIchigan
It's just like any other fluid. It degrades and gets contaminated over time. Just change it and feel good about it.
BTW: It gets dark from the rubber lines.

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#4585972 - 11/26/17 06:19 PM Re: Break Fluid??! [Re: miden851]
Ducked Offline


Registered: 10/25/12
Posts: 4388
Loc: Taiwan
Originally Posted By: miden851
My old car calls for DOT 4; I was wondering how important is the replacement for you and how many of you keep up with maintenance of the fluid;

On the note, I replaced mine today after many, many miles, and little or if any difference in braking power IMO





You won't notice any difference in "braking power" (whatever that is meant to mean). As long as the brake fluid is a liquid, it'll work right up until it isn't.

Then it won't.

Water would work as a brake fluid, until it didn't

If (as is likely) old brake fluid caused corrosion in the system, you MIGHT notice some deterioration in function (sticking pistons, for example) prior to (possibly catastophic) failure.

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#4585975 - 11/26/17 06:26 PM Re: Break Fluid??! [Re: miden851]
2015_PSD Offline


Registered: 09/26/10
Posts: 7243
Loc: SE Texas
Brake fluid is hygroscopic and absorbs water from the air and once absorbed, it cannot be separated. I change mine every 3-4 years, not a major expense and it keeps the system fresh and working well.
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2018 MB AMG GLC43 3.0L Coupe - M1 0W-40/OEM
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#4586003 - 11/26/17 06:58 PM Re: Break Fluid??! [Re: 2015_PSD]
Colt45ws Offline


Registered: 08/15/06
Posts: 9648
Loc: Central Washington
Originally Posted By: 2015_PSD
Brake fluid is hygroscopic and absorbs water from the air and once absorbed, it cannot be separated. I change mine every 3-4 years, not a major expense and it keeps the system fresh and working well.

Right. I do about 2 years which might be overly cautious but I like to keep it fresh.
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#4586007 - 11/26/17 07:04 PM Re: Break Fluid??! [Re: skyactiv]
philipp10 Offline


Registered: 05/09/14
Posts: 1184
Loc: Minnesota
Dark? More than likely that is seal material. Seals are black.

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#4586009 - 11/26/17 07:06 PM Re: Break Fluid??! [Re: E150GT]
philipp10 Offline


Registered: 05/09/14
Posts: 1184
Loc: Minnesota
Originally Posted By: E150GT
Originally Posted By: philipp10
I have been saying it for years (but no one will listen) that a well designed brake system will keep the fluid dry. Furthermore, even if water gets in the fluid, unless your in the mountains or towing, your not going to boil the fluid. I never bleed my brakes yet have never replaced a caliper. Go figure.

If you keep your car for only a few years this is correct. Why change it? If you keep it for a long time, change it regularly. Your brake system corrodes from within and you canít see it and one day it will fail you. Mine did and luckily I was in a parking lot. I would have been in deep kimchi had I been on the highway.


I have always drove my cars 12-14 years....

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