Two year brake fluid change - Mercedes GLA Forum
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post #1 of 16 Old 03-29-2017, 08:33 PM Thread Starter
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Two year brake fluid change

I performed my 2 year brake fluid exchange several weeks ago. I pressurized the reservoir to 20 psi and bleed the wheel brake calibers starting at the right rear, working from the farthest to the closest to the reservoir. Only problem I had was that I used more fluid than I should have because the color difference between the old and new fluid was not easily discernible. It would be great to know how much fluid should be bleed from each wheel brake caliber if the old fluid is suctioned from the reservoir and replaced with new fluid. I guess it could be approximated if the lengths of the brake lines were known, assuming they all had the same inner diameter. The shop manual has a diagram but I doubt if it is to scale. Does anyone know the actual lengths of the brake lines?
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post #2 of 16 Old 03-29-2017, 09:42 PM
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You can get brake fluid that has dye added that gives you different colors. This way when the color changes you can see it very different.
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post #3 of 16 Old 03-30-2017, 02:43 PM Thread Starter
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Thanks for the suggestion, but I thought it would be best not to mix brake fluid brands since you do not flush 100% of the old brake fluid. I used OEM Mercedes Benz Dot 4 plus fluid.
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post #4 of 16 Old 03-30-2017, 06:06 PM
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Originally Posted by WeGla250 View Post
Thanks for the suggestion, but I thought it would be best not to mix brake fluid brands since you do not flush 100% of the old brake fluid. I used OEM Mercedes Benz Dot 4 plus fluid.
Okay to mix brand as you are replacing like 99.9% of it, as when you see the new color you have replaced that line as you moved to the other you are replacing them and the reservoir will be refilled each time with new color. just keep the same DOT rating as required by MB.

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post #5 of 16 Old 04-04-2018, 04:33 PM
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Originally Posted by WeGla250 View Post
I performed my 2 year brake fluid exchange several weeks ago. I pressurized the reservoir to 20 psi and bleed the wheel brake calibers starting at the right rear, working from the farthest to the closest to the reservoir. Only problem I had was that I used more fluid than I should have because the color difference between the old and new fluid was not easily discernible. It would be great to know how much fluid should be bleed from each wheel brake caliber if the old fluid is suctioned from the reservoir and replaced with new fluid. I guess it could be approximated if the lengths of the brake lines were known, assuming they all had the same inner diameter. The shop manual has a diagram but I doubt if it is to scale. Does anyone know the actual lengths of the brake lines?

Thanks for the info. I am about to do this on my 2016.

How much fluid did you end up using?

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post #6 of 16 Old 04-04-2018, 05:27 PM
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DOT in the USA banned various colors of brake fluid. This is a major contention on other Forums (Porsche for instance). Brake fluid is cheap. Buy extra. Bleed until you've gone overboard.
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post #7 of 16 Old 04-04-2018, 06:01 PM
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When I had my B service in February they charged $27.73 for brake fluid. Doesn't say how much they used.

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post #8 of 16 Old 04-04-2018, 06:06 PM
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DOT in the USA banned various colors of brake fluid. This is a major contention on other Forums (Porsche for instance). Brake fluid is cheap. Buy extra. Bleed until you've gone overboard.

Good to know that dye is an issue. I personally haven't had any problems distinguishing between new/old fluid. I use a Mityvac MV6835 Vacuum Brake Bleeding Kit (bought from Amazon) which has a clear drain pipe and works great.

I agree that brake fluid is cheap, I just don't want to have to store the extra or run to the store in the middle of the job

So it would be nice to get an idea of how many liters I need to have on hand for the GLA.

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post #9 of 16 Old 04-04-2018, 06:16 PM
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Don't store the extra. It will attract water once the seal on the container is broken. The idea of bleeding is to get rid of the water that accumulated in the sealed system that controls your brakes. The opened bottle is no better at keeping moisture out.
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post #10 of 16 Old 04-04-2018, 06:25 PM
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Don't store the extra. It will attract water once the seal on the container is broken. The idea of bleeding is to get rid of the water that accumulated in the sealed system that controls your brakes. The opened bottle is no better at keeping moisture out.


Yes, forgot to clarify that. I don't want to store unopened bottles either. My garage is so packed that I keep finding stuff I didn't know I had


I guess I will have to do this and then report back about how much brake fluid the job needs. My guess is that the GLA45 probably needs a bit more than GLA250.

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