Does everybody change there Brake fluid at 45000 miles - TerrainForum.net: GMC Terrain Forum
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post #1 of 27 (permalink) Old 08-21-2016, 09:21 AM Thread Starter
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Does everybody change there Brake fluid at 45000 miles

I had mine tested and it was at 1% water in it.

Going to test again at 50000 miles.

What is your opinion on a full change ?
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post #2 of 27 (permalink) Old 08-21-2016, 09:28 AM
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Re: Does everybody change there Brake fluid at 45000 miles

Good idea to get it changed in my opinion.

Brake fluid just kind of sits in place and when water content builds up in it, it can cause rust in brake lines, the brake pad pistons and cylinders and cost $$$.

They have a machine at most dealers that can flush the entire system at each wheel and replace with fresh fluid. If I keep a vehicle for 5 years or more I have it done. By that time, it is due. I am about ready to do it to my truck.

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post #3 of 27 (permalink) Old 08-21-2016, 10:01 AM
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Re: Does everybody change there Brake fluid at 45000 miles

Not "recommending" this, but just for some perspective here: been maintaining my cars for 30 years now, approaching 1 million miles driven with 5 vehicles, and only replaced brake fluid *once* - on my Taurus - and only because the master cylinder had to be replaced at 200,000 miles!

So - probably a good idea to do it, but my experience says - at least here in the warmer Southeast, not really necessary unless you're doing it as part of another repair.

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post #4 of 27 (permalink) Old 08-21-2016, 12:14 PM
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Re: Does everybody change there Brake fluid at 45000 miles

Usually when I replace the brake pads I'll flush the fluid. I mean, heck you're already in there so why not?
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post #5 of 27 (permalink) Old 08-21-2016, 09:41 PM
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Re: Does everybody change there Brake fluid at 45000 miles

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Originally Posted by Colt Hero

So - probably a good idea to do it, but my experience says - at least here in the warmer Southeast, not really necessary unless you're doing it as part of another repair.
Is temperature the cause of need to change, or is it humidity ? I vote for humidity - but wouldn't bet my life on it.

I'm with you though. When I get bored, I think about changing it, but seldom do it. I've driven cars for up to 20 years with no brake line rust issues.

Also, I think that time is the trigger for need to change, not miles - but again, just my opinion.

Any educated thoughts
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post #6 of 27 (permalink) Old 08-21-2016, 10:45 PM
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Re: Does everybody change there Brake fluid at 45000 miles

I did it at 5 yrs (82,000) on my 2010 Traverse

On my 2003 Trailblazer did it at 5 yrs and I think it was 100,000.

Simply because of age.
The good thing for me-- is that its super easy.
Takes 20-30 min.

Opening the the bleeder is also easy. No rust whatsoever.
This is what my brake parts looks like at 5 yrs....
they still look the same now.
the bleeders have a rubber cap over the tip.. (thus the shiny metal)


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post #7 of 27 (permalink) Old 08-22-2016, 01:14 PM
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Re: Does everybody change there Brake fluid at 45000 miles

I don't have any rule of thumb, but if I do it, it's with a brake pads or calipers. I did my truck recently (110K miles and 10 years) because my calipers were pretty bad and one had seized up. I emptied the reservoir with a turkey baster and refilled with new fluid. At that point, I just let it "drip" out mostly and then purged the air.

I've only ever done it sporadically and never felt a difference. I have had brake lines rust out, but I'd say it was mostly from the outside in.

I live in the north though, and deal with really "dry" winters, so I mostly have only done it because the fluid looked dark or contaminated. Humidity is the enemy of brake fluid. It absorbs moisture, and it lowers the boiling point of the fluid, which gives the spongy feeling when your brakes get hot. Ive heard that you shouldn't buy more than you need either. Any bottle that has been opened is suppose to be used up in a short period. Likewise for the reservoir, don't take the cap off any more than you need to.

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post #8 of 27 (permalink) Old 08-22-2016, 01:34 PM
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Re: Does everybody change there Brake fluid at 45000 miles

hi ,

GM recommends brake fluid flush / fill every 30,000 miles or 48,000 kms or every 2 years .....

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post #9 of 27 (permalink) Old 03-08-2018, 05:51 PM
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Supposed to be every 2 years.

I did mine - really easy job with a helper to pump the pedal.
Less than half an hour to do all 4 and put stuff away.
Easier to access fronts if the wheel is turned out.
No jacking or ramps needed.

My fluid was 3 yrs old and was pretty dirty.

$8 for a litre of DOT3 ... why not?
Peace of mind re longevity of components.
Wasn’t for a safety related concern for me ... just keeping everything working like new longer.

Last edited by 2016eq; 03-08-2018 at 05:56 PM.
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post #10 of 27 (permalink) Old 03-08-2018, 06:33 PM
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Quote:
Originally Posted by 2016eq View Post
Supposed to be every 2 years.

I did mine - really easy job with a helper to pump the pedal.
Less than half an hour to do all 4 and put stuff away.
Easier to access fronts if the wheel is turned out.
No jacking or ramps needed.

My fluid was 3 yrs old and was pretty dirty.

$8 for a litre of DOT3 ... why not?
Peace of mind re longevity of components.
Wasn’t for a safety related concern for me ... just keeping everything working like new longer.


If your car is a GM model and has antilock brakes (ABS), a complete brake fluid change includes activating the ABS module shutter valves with the GM TECH 2 device, to ensure all of the fluid is exchanged.
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