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      07-21-2018, 04:24 AM   #1
djwoodyuk
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Best Brake Fluid for F30

Hi.
I am looking to change my brake fluid shortly.
Which would you recommend?
I have been looking at Pentosin DOT4 LV. Seems good value.
I am not tracking the car, so just need it for fast road.
Also, it is just 1 litre I need?

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      07-21-2018, 09:31 AM   #2
Billfitz
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BMW fluid is no more expensive than most.
Before changing mine I got one of these, to be sure that it actually needed changing:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

It showed the water content of my brake fluid at 0%, saving me the bother of changing it when it wasn't due.
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      07-21-2018, 09:48 AM   #3
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Quote:
Originally Posted by Billfitz View Post
BMW fluid is no more expensive than most.
Before changing mine I got one of these, to be sure that it actually needed changing:
https://www.amazon.com/gp/product/B0...UTF8&psc=1

It showed the water content of my brake fluid at 0%, saving me the bother of changing it when it wasn't due.
Wow, cool gadget. May have to pick one up. Anyone know what the recommended interval for changing fluid? I seem to remember it being really long, like 100k miles but I could be wrong...
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      07-21-2018, 12:29 PM   #4
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the recommended interval is every 2 years.

I plan to use ATF super blue (or the US variant super gold) when I do it.
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      07-21-2018, 01:01 PM   #5
Billfitz
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It's two years or 20k miles, but there's nothing scientific about that interval, they just figure it's better to change the fluid before it gets water in it rather than later. I'm at 3 years but only 12k miles, so I wanted to be sure it was broken before I fixed it, what with the purging and bleeding procedure being the PITA that it is.
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      07-21-2018, 02:14 PM   #6
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Quote:
Originally Posted by Billfitz View Post
BMW fluid is no more expensive than most.
Before changing mine I got one of these, to be sure that it actually needed changing:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

It showed the water content of my brake fluid at 0%, saving me the bother of changing it when it wasn't due.
Bill, instruction said to dip into reservoir to check. But brake fluid doesn't circulate back up to the reservoir. Don't you need to bleed some out from any caliper to get a better measurement? Cool gadget though.
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      07-21-2018, 02:41 PM   #7
rak299
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I would expect water content to be highest at the reservoir. At the caliper or in the lines, how would water get in?
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      07-21-2018, 03:16 PM   #8
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Quote:
Originally Posted by rak299 View Post
I would expect water content to be highest at the reservoir. At the caliper or in the lines, how would water get in?
+1, the main source of contamination would be water vapor that gets past the reservoir cap. For water to get in further down the line there'd have to be a leak. The directions with the tool say that 2% water content is OK, but I wouldn't wait for it to hit 3% before changing it.
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      07-21-2018, 05:41 PM   #9
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Castrol SRF hands down. Change out 1x per season since it has such a high wet boiling point.
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      07-21-2018, 05:59 PM   #10
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Quote:
Originally Posted by Billfitz View Post
It's two years or 20k miles, but there's nothing scientific about that interval, they just figure it's better to change the fluid before it gets water in it rather than later. I'm at 3 years but only 12k miles, so I wanted to be sure it was broken before I fixed it, what with the purging and bleeding procedure being the PITA that it is.
If its every 20k, why arent dealers performing this under the 50k maintenance warranty?

Has anyones dealer performed this service for free under warranty?
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      07-21-2018, 06:31 PM   #11
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They should, it is a CBS item, just like oil and so forth. I got the dashboard notice that it was due, but didn't take it to the dealer, as that's a 3 hour round trip, plus the time spent waiting. I'd have changed it myself if it turned out that it did need it, and will when that time comes.
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      07-30-2018, 05:32 AM   #12
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CBS!
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      07-30-2018, 05:00 PM   #13
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I use RBF600 and flush once a year. Thinking about trying SRF as I've heard good things, but have yet to boil the RBF. I do a bleed after every couple track days to keep the pedal nice and taught.
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      07-30-2018, 05:02 PM   #14
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Got my brake fluid done for free as part of free maintenance. Had to pay for new tires though.
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