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Discussion summary
YOUR RESEARCHIs an annual brake flush a must do?
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Check brake fluid
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Suggestion
- Checking the brake fluid with a brake fluid refractometer.
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Suggestion · Original poster
I'll have my guy check the fluid for water content and make a decision.
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Suggestion
Generally acceptable methods of checking the moisture content in brake fluid include:
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Suggestion
Porsche recommends changing the fluid every two years for normal driving.
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Suggestion
The two year recommendation from Porsche is really for people who drive their cars on the street and who don't want to screw around with testing the fluid.
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I know annually is recommended by Porsche. Thoughts about coolant flush frequency. My car has 33k miles. Has had a brake flush about 18 months ago and I'm assuming a coolant flush in its lifetime.
Brake fluid interval is every 2 years. Not yearly.
Coolant, replace at the same time you replace the water pump. About every 4-6 years, depending on your risk tolerance level.
Brake fluid interval is every 2 years. Not yearly.
Coolant, replace at the same time you replace the water pump. About every 4-6 years, depending on your risk tolerance level.
Porsche recommends changing the fluid every two years for normal driving. Most people who track their cars change it more frequently. The concern with brake fluid is that it is hydrophilic. If water gets into the fluid, it reduces braking efficiency and it can corrode brake components. This can happen even in a car that is just sitting in a garage.
You can change it every two years, or a good mechanic can analyze your brake fluid for water content and let you know if your fluid is okay or needs a change.
Good info. Thanks all.
I do use the brakes some. Mostly when I power brake for my launches. I'll have my guy check the fluid for water content and make a decision.
What fluid is everyone using? I had planned to switch to blue fluid when I flushed the system to easily identify the new stuff, but that's no longer an option. I recently posted this chart in another thread:
I guess because of the ABS system, SL6 would be the preferred fluid?
If the fluid is nice and clear in the reservoir, no need to change it. The easiest way to change it is to suck the fluid out from the reservoir with a turkey baister and top it up with new. Drive the car for a few weeks and then repeat this. Do this 3-4 times and the brake fluid will be all new.
Generally acceptable methods of checking the moisture content in brake fluid include:
- Checking the brake fluid with a brake fluid refractometer. This is fast, easy and accurate. It only takes a few drops of brake fluid for an accurate reading.
- Checking the brake fluid with brake fluid test strips. This is fast and easy, although it's generally not as accurate as a refractometer.
- Non-scientific methods. These include: visual inspection, use of a multi-meter to check the voltage readings in the fluid (which should give you an idea of the moisture content), and I'm sure there are more (tasting it? smelling it? who knows?). These might be okay for a quick gut check, but they don't give you any useful information.
The two year recommendation from Porsche is really for people who drive their cars on the street and who don't want to screw around with testing the fluid. If you just change it every two years, you will most likely be fine.
If you don't want to check it, then just change it every two years and don't worry about it. If you want to check it, then use an accepted method to ensure accuracy.
I read an interesting article in a Porsche magazine recently about a 959 that had been sitting since the 1980s in "as delivered" condition from the factory. It hadn't been titled or delivered, and had essentially not been driven since production. It went through an extensive reconditioning program to make it street worthy. All the brake calipers needed to be rebuilt. They were seized due to internal corrosion. The brake fluid had almost no miles, but it had a high moisture content that ruined the internal components.
