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Old 04-16-2019, 10:08 PM
pastman pastman is offline
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Dot 4 brake fluid

I'm about to replace calipers, rotors and pads on my '07 328xi coupe. With 214K on the car, I think it is well-deserved. Question: are all DOT 4 brake fluids created equal? Any opinions out there on what to avoid (if that's possible) or to recommend? Please advise.

Pastman
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Old 04-16-2019, 11:14 PM
gbalthrop gbalthrop is online now
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Quote:
Originally Posted by pastman View Post
I'm about to replace calipers, rotors and pads on my '07 328xi coupe. With 214K on the car, I think it is well-deserved. Question: are all DOT 4 brake fluids created equal? Any opinions out there on what to avoid (if that's possible) or to recommend?
Have you bled system every 2 years as BMW recommends? Have you used "Low Viscosity" DOT 4 fluid as BMW recommends? I have NO IDEA how critical either is to preventing fluid boiling issues from water absorption, leaking caliper seals, or any other issues with the system. Here is an example of the options available. If anyone has an engineering-based opinion on which one is the best value and why, please advise:
https://www.autohausaz.com/catalog/k.../brake%20fluid

As for replacing calipers or rotors, my thoughts:

1) Calipers: Unless they leak or are sticking so as to pull when you apply or release brakes, or one or more feels noticeably hotter than the others after a 10 minute run in traffic (a sign of sticking), I would NOT replace a caliper "just because" of age or mileage.

2) Rotors: TIS & Bentley provide minimum thickness specs, and unless a disc is at or below minimum thickness, or causes "Judder" when braking due to "runout" or glazing issues, or has obvious rust or structural issues, I also would NOT replace Rotors "just because." I have seen cheap replacement rotors cause Judder issues within a year of being installed, where there were NONE before.

Your car & your money/time. I'm a "bottom-fisherman" (cheap) and basically don't "fix" something until wear specs, or performance/ safety concerns appear, suggesting it's "broke."

Please let us know your thoughts & reasoning,
George
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Old 04-17-2019, 07:09 AM
08 335Ci 08 335Ci is offline
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I suggest you consider changing your flex lines while the system is apart. After 12 years and 214K I'm sure they need it. ECS has reasonable SS kits.

Also replace the caliper 'pins', they do wear.

Make sure the fluid says 'low viscosity' or 'For ABS use'. If you're not using BMW fluid, make sure you get all the old stuff out. Some fluids don't play well together. Buy extra fluid and make sure you cycle the ABS pump during the bleed.
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