Brake pad warning ?

lordbmw · 06-18-2019, 06:32 PM

If the brake pads get too thin, will I get a warning?

If so, is it based on actual measured pad thickness or simply based on the last recorded service date?

TIA

Dpc2u · 06-18-2019, 07:40 PM

Started to write a chapter on how it works, but this is easier. Read this, post 7.

https://www.e90post.com/forums/showthread.php?t=618871

Efthreeoh · 06-19-2019, 08:29 AM

To plagiarize myself...

The CBS keeps track of the wear rate of the pads by the wear on the sensor. The sensor is dual-stage, which means it wears halfway through and records the event in the CBS computer (a loop of wire imbedded in the sensor breaks). There is no notification provided when the 1st loop of wire breaks. The second stage is when the second wire loop in the sensor breaks which triggers the red "Brake" icon. When that happens the CBS menu will show either the front or rear axle at -- miles left on the brake pads. It does that so you know which axle needs new brakes. The sensor is dual-stage so as to provide the CBS with an actual wear rate of the pads, which allows the CBS to estimate the remaining miles left on the pads. However once the 2nd wire loop breaks and the red "Brake" icon comes up, one or both sets of pads are worn out and need replacement.

06-18-2019, 06:32 PM	#1
lordbmw Captain 270 Rep 790 Posts Drives: 2010 BMW 335xi Coupe (AT) Join Date: Sep 2016 Location: Alexandria, VA iTrader: (0)	Brake pad warning ? If the brake pads get too thin, will I get a warning? If so, is it based on actual measured pad thickness or simply based on the last recorded service date? TIA
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06-18-2019, 07:40 PM	#2
Dpc2u Major 11503 Rep 1,069 Posts Drives: E93 M3, E60 M5, F15 X5, E46 Join Date: Feb 2019 Location: Middle Tennessee iTrader: (0)	Started to write a chapter on how it works, but this is easier. Read this, post 7. https://www.e90post.com/forums/showthread.php?t=618871 __________________ E46, E60 M5, E93 M3, F15 X5 IG - @thebimmerhaus
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06-19-2019, 08:29 AM	#3
Efthreeoh General 17204 Rep 18,694 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	To plagiarize myself... The CBS keeps track of the wear rate of the pads by the wear on the sensor. The sensor is dual-stage, which means it wears halfway through and records the event in the CBS computer (a loop of wire imbedded in the sensor breaks). There is no notification provided when the 1st loop of wire breaks. The second stage is when the second wire loop in the sensor breaks which triggers the red "Brake" icon. When that happens the CBS menu will show either the front or rear axle at -- miles left on the brake pads. It does that so you know which axle needs new brakes. The sensor is dual-stage so as to provide the CBS with an actual wear rate of the pads, which allows the CBS to estimate the remaining miles left on the pads. However once the 2nd wire loop breaks and the red "Brake" icon comes up, one or both sets of pads are worn out and need replacement.
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