30k service $1000??!

[DennisD]

Not entirely closed.

There’s a vent in the reservoir cap.

Has to be because fluid level goes down as brake friction linings wear and no vent would result in a vacuum which would draw air into system past the seals, or create pressure when new linings are fitted & pistons are pushed back into the callipers.

While the reservoir has a vent, the braking mechanism is closed. If you get air in the brake lines, the brakes start to feel spongy.

So to recap, a "closed" system can get air into the system but that simply means that something is defective. You are talking very small amounts of air in normal wear and tear into your brake fluid.

Even though brake fluid is hydroscopic, it is being introduced to outside air in a very minimal way. That explains why more times than not, you will not need to worry about changing brake fluid as often as "they" recommend.

It would be like bridge capacity weight. While a 5 ton sign would mean that you should not drive on it with a 5 ton truck, the bridge can actually hold much more (unless it is defective).

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[Byrus]

So did the op end up going somewhere else?

 

[Mrs Chivus]

I took my '21 in for the 30,000 mile service 2 weeks ago. I did have the brake fluid flush done because I'm afraid they'll invalidate my extended warranty if I don't follow the recommended maintenance schedule. I also had the tires rotated. It was under $200.

 

[Herbknowsit]

Brought up a good point there Chivus. I know from experience on warranties that they will try and weasel out of anything they can so it is wise to learn what service you HAVE to do in order to keep your extended warranty operational.
This thread reminds me of a great line from the film The Big Lebowski. "just because we are bereaved doesn't mean we're saps!" This was in regards to getting overcharged on burial materials. But it certainly applies to car dealers.

 

[ChuckA]

I took my '21 in for the 30,000 mile service 2 weeks ago. I did have the brake fluid flush done because I'm afraid they'll invalidate my extended warranty if I don't follow the recommended maintenance schedule. I also had the tires rotated. It was under $200.

You don’t have an extended warranty, you have an extended service plan. It’s an insurance plan that pays the costs according to its terms, not Ford’s.

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