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Does brake fluid dry up? #4492777
08/19/17 12:08 PM
08/19/17 12:08 PM
Joined: Mar 2008
Posts: 638
A Warm place to live in
berniedd Offline OP
berniedd  Offline OP

Joined: Mar 2008
Posts: 638
A Warm place to live in
The question may be laughable, but it's been 6 years since I last checked the brake fluid level in the 1998 CRV. Nine months ago, I discovered I was low on brake fluid, so low that the master cylinder almost was ready to suck in air. I filled her up and today (9 months later) the level has not changed any. There are no leaks I can see anywhere. If there's a leak, I would have seen lower brake fluid level by now.

Some may opine that the brake fluid in the MC was less as the pads wore down and the pistons moved further out their bores and took in more brake fluid as they did so. But I'd replaced brake pads 11 months ago and pushed in the pistons with my C-clamp, thus pushing the brake fluid back up into the MC. (I didn't check the brake fluid level at that time.) All the calipers were bone dry when I did the job.

Anybody with ideas on where my brake fluid went?

Re: Does brake fluid dry up? [Re: berniedd] #4492807
08/19/17 12:52 PM
08/19/17 12:52 PM
Joined: Jul 2017
Posts: 542
Texas (south)
FermeLaPorte Offline
FermeLaPorte  Offline

Joined: Jul 2017
Posts: 542
Texas (south)
Thats just what happens with daily use, even if there are no leaks


Always Mobil 1
2014 1.6L Nissan Versa Sedan, 5 spd, 5k OCI.
2011 3.5L Chevrolet Impala, Automatic, 5k OCI.
Re: Does brake fluid dry up? [Re: berniedd] #4492808
08/19/17 12:53 PM
08/19/17 12:53 PM
Joined: Sep 2015
Posts: 6,179
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline

Joined: Sep 2015
Posts: 6,179
Kalifornia Kollective
9 years without flushing the fluid ... Hard braking down hill can boil the fluid because there is water being absorbed all the time. Brake fluid absorbs water slowly, but after nine years, it was pretty wet. Would not take much to boil that ...

Brake fluid should be flushed every three years or so smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Does brake fluid dry up? [Re: BrocLuno] #4493340
08/20/17 01:29 AM
08/20/17 01:29 AM
Joined: Jun 2002
Posts: 19,774
Iowegia - USA
MolaKule Offline
Global Moderator
MolaKule  Offline
Global Moderator

Joined: Jun 2002
Posts: 19,774
Iowegia - USA
Originally Posted By: BrocLuno
9 years without flushing the fluid ... Hard braking down hill can boil the fluid because there is water being absorbed all the time. Brake fluid absorbs water slowly, but after nine years, it was pretty wet. Would not take much to boil that ...

Brake fluid should be flushed every three years or so smile


thumbsup

Absolutely.


"I can't change the direction of the wind, but I can adjust my sails to always reach my destination." Jimmy Dean
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