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Old 09-25-2017, 07:27 PM   #1
johnny57

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Default *A question on modern cars

I was at the dealer getting my 99 Camaro's oil changed and the rep told me the brake fluid needed changing and asked when the last time I changed it, I told him never. I have never changed any of my car's brake fluid and never heard it needed to be done. My friends have not changed theirs either but the rep told me it should be changed every 5 years. Do you guys change your modern car's brake fluid like the antifreeze and other fluids?
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Old 09-25-2017, 07:37 PM   #2
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time for a different dealer Johnny. never in over 50 years of owning cars have I heard this.
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Old 09-25-2017, 07:54 PM   #3
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Brake fluid is hydroscopic and absorbs moisture over time.....

That moisture can saturate the fluid and boil into steam under high braking temps resulting in pedal fade....

I don't worry about it here in SOCal but it is a good Idea to flush it every several years in wet/humid climates especially where thermal cycling during seasons of the year....

Your mechanic is correct....
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Old 09-25-2017, 08:00 PM   #4
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Wife's Mercedes calls for changing brake fluid at 50000 miles. Supposedly due to moisture although it's hard to believe since it's a closed system.
Larry
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Old 09-25-2017, 08:07 PM   #5
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Absolutely a good idea to change ALL your fluids periodically. I flush my brake fluid and replace every 2-3 years, along with my anti freeze.
Fluids wear out, break down, and get dirty (as well as absorb moisture) and need to be changed. I also drain and refill my rear end at least every five years as well, not to mention the P/S and tranny fluid as well.
Keeping moisture out of your brake system will not only improve performance, but keep parts from rusting too.
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Old 09-25-2017, 08:08 PM   #6
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The advice is correct for any car, because as said brake fluid is hygroscopic, it absorbs water.

The fluid becomes blacker as the water content increases. The boiling point is also lowered as the water content increases.

Why does a wheel cylinder or master cylinder rust or pit? Because of that water.
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Old 09-25-2017, 08:11 PM   #7
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Some of the new anti paint remover fluids claim permanent. Personally I have replaced masters due to old water contaminated fluid. You can buy test strips that indicate wheather moisture is present or not.
Jimmy
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Old 09-25-2017, 08:12 PM   #8
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Yes it must be done in new cars. If someone told you you don't need to change it they are wrong. Read your owners manual look under regular scheduled maintenance. I have worked a modern cars for the last 22 years and yes you must change your fluid. Todd
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Old 09-25-2017, 08:41 PM   #9
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Need to change fluid, I use turkey baster to remove fluid from master and then bleed brakes to complete.
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Old 09-25-2017, 08:56 PM   #10
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I never have unless I break open the system to replace something ie wheel cylinder, hose or a line. Mike
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