01-10-2020, 09:45 AM | #1 |
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CBS - Brake Fluid and Rear Pads
Hey guys,
Curious if anyone has any technical knowledge on how the CBS works when it comes to Brake Fluid and pad-wear. My car is now at 82k kms (51k miles), and I received a message from the CBS saying Brake Fluid is due to be changed. At only 82k kms and the car being less than three years old, it seems a bit soon to me. I also received a message saying the rear brake pads are due. Is this due to a km threshold being reached, or are there accurate sensors that determine brake wear on the front and rear pads? I don't mind doing them, I'm just curious if it's a necessity or not... or if BMW codes the system to have both of these changed just after the standard warranty expires? Thanks in advance for your responses! |
01-10-2020, 10:43 AM | #2 |
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Brake fluid is time based I believe (2yrs). For pad wear there's a sensor with electrical contacts that gets ground down by the rotor. When the contact gets ground down and an open circuit occurs it says you should change the brakes because the pad thickness for that to happen is low. Before that though the mileage countdown is modeled, and not necessarily accurate.
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01-10-2020, 10:46 AM | #3 |
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If you haven't been driving the car very hard your brake fluid should still be serviceable. However, BMWs interval is two years. Some will hem and haw about following their recommendation (claiming wastefulness) but I bleed mine four times in that period to maintain for HPDE, it's all about usage.
Doing a visual inspection on the rear brakes is pretty easy, just shine a flashlight and observe the pad thickness. There is a pad sensor but it is a simple conductor, it has no bearing on the CBS system until it makes physical contact with the rotor. The lighter the use, the more likely your rear pads expire first due to electronic brake proportioning.
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GingerPilotGuy5.50 |
01-10-2020, 11:30 AM | #4 |
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Brake fluid intervals are time based, as there's no mechanism on the car that can measure brake fluid water content. I got one of these so I wouldn't change it either too early or too late:
https://www.amazon.com/ITEQ-Liquid-T...NsaWNrPXRydWU= Brake pads are time and condition based, though the only condition the car can detect is when a sensor trips, at which point you've got a thousand miles or less to go. |
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GingerPilotGuy5.50 |
01-10-2020, 01:43 PM | #5 | |
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Quote:
As for the pads. I've been watching the kms count down for a while, so I knew the alert was coming. I don't drive the car hard nor are the pads super worn down. I wonder if it would be best to reset the pad alert and wait for another 10k kms or until the sensor trips it again... |
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01-10-2020, 01:50 PM | #6 | |
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Quote:
http://f30.bimmerpost.com/forums/sho....php?t=1471617 |
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