brake fluid

[pschaars951]

hey everyone,

my dad has an '06 911 C4 and whenever he takes it to the dealership for any warranty work, or maintenance they tell him he needs to replace the brake fluid. Any thoughts on why? how does brake fluid deteriorate? if dirt was getting into the system wouldn't there be a much more severe problem to tackle than fluid replacement?

side note: has anyone figured out how to rebuild a tire pressure management sensor yet?

[dsmyth]

Brake fluid absorbs water at the approx rate of 1% per year . 2% water after 2 years . Pistons in calipers start to rust and pedal becomes spongey as the fluid heats up. Particles of copper start to electroplate in ABS. Lots of good reasons to replace every two years.

[dsmyth]

Forgot to mention water is attracted through moisture in the air via microscopic holes in the system around clamps ect. No way to prevent it from happening. Doug

[Flieger]

Originally Posted by dsmyth

Forgot to mention water is attracted through moisture in the air via microscopic holes in the system around clamps ect. No way to prevent it from happening. Doug

And the necessary vent hole in the reservoir cap.

[Driver_X]

Has the brake fluid been flushed in the last 5 + years?

[Quicksilver]

Originally Posted by Flieger

And the necessary vent hole in the reservoir cap.

There is a flexible rubber membrane that seals off the master cylinder from the moisture in the atmosphere on all street cars. Some racing master cylinders do just have a direct vent hole but that is because the fluid will be changed each race.

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Oh and on the street the brake fluid should be replaced every 2 years if you want your car to last.

[lupin..the..3rd]

Originally Posted by pschaars951

hey everyone,

my dad has an '06 911 C4 and whenever he takes it to the dealership for any warranty work, or maintenance they tell him he needs to replace the brake fluid. Any thoughts on why? how does brake fluid deteriorate? if dirt was getting into the system wouldn't there be a much more severe problem to tackle than fluid replacement?

How often is he going to the dealer for service? Brake fluid must be replaced every 2 years at most - no matter what kind of car you drive, whether it's a Kia or a Volvo or a Porsche. If you live in a humid climate, every 12 months is a better interval. If you participate in competition or performance driving events with your car, every 6 months is the recommended brake fluid change interval.

[Flieger]

Originally Posted by Quicksilver

There is a flexible rubber membrane that seals off the master cylinder from the moisture in the atmosphere on all street cars. Some racing master cylinders do just have a direct vent hole but that is because the fluid will be changed each race.

---
Oh and on the street the brake fluid should be replaced every 2 years if you want your car to last.

Not on early cars, mine just vents right to atmosphere. I had to have a tube running into the smuggler's box and through a hole in the bottom of the car or else it would get all over the paint in my front trunk.

When I had the reservoir replaced, the tube was run down to the front of the tub from the back of the reservoir.