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Old 12-02-2009, 06:21 AM   #1
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Why do Jeeps Brake Fluid Change So Fast..

I've had 5 cars and my 2008 Jeep is diff, with only 13k, the brake fluid is DARK, my cousin has a Jeep also and his is the same way, all my other vehicles the fluid stayed clear for a longgggg time. Any ideas why ours turn dark so fast?

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Old 12-02-2009, 06:32 AM   #2
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Ask the dealer about it as it is still under the 36K warranty. I would worry about it if it doesn't stop any more when pressure is applied to the brake pedal. I have never looked at the color of the fluid on mine. I don't look at it because all appears normal with the brakes. Could it be that it was dark to begin with? There is no heat process in braking, just a cylinder that moves transferring pressure from the foot to the pads. Even if it were clear when it was new and it turns dark in all jeeps, wouldn't it just mean that there is something in the system giving up pigment to the oil? I'm speculating.

Now that you have brought it up, I guess I'll have to check mine out. Usually the dealer does that at normal PM intervals.

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Old 12-02-2009, 06:32 AM   #3
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Brake fluid absorbs water; flush it with another brand. If it still changes color quickly you might have a bad cap.
Use DOT 3 or 4; synthetic is okay too. But don't use DOT 5; it's a different animal and is not compatible at all.
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Old 12-02-2009, 06:36 AM   #4
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Bill, we posted at the same time. So you are saying that moisture will turn it dark from clear?
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Old 12-02-2009, 06:51 AM   #5
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Quote:
Originally Posted by jk'n View Post
Bill, we posted at the same time. So you are saying that moisture will turn it dark from clear?
Absolutely. No system is completely sealed and heating/condensing cycles lead to moisture. It is designed to fully absorb the moisture rather than permit droplets to form.
And when it carries too much moisture it swells the lines; that's the reason we bleed our brakelines regularly.
Water in the lines can also cause fade/failure if your calipers heat it up too much under severe conditions.

I've used some exotic synthetics over the years like Redline, Torco, Belray --- but I usually just use Valvolene DOT 4 synthetic now.
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