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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 05-10-2013, 05:46 PM
thedonesco thedonesco is offline
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Help with brakes 335xi

08 335xi
I need some clarity my front brake pads light came on for being worn out
I put put new pads in but Iam having trouble resetting the light
According to the dealer I need to change the pad sensor every time I do a brake change
Is this true? Can i reset it some other way
They said the sensor really cheap 25 but I Juss want to make sure
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  #2  
Old 05-10-2013, 05:59 PM
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Zeichen311 Zeichen311 is offline
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The warning light comes on when the rotor abrades through the tip of the sensor, destroying it. You must replace the sensor.

It is a good idea to replace the sensor whenever you change pads, whether it has tripped or not. It is designed to be used once and may not remain secure when transferred to new pads.
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N47 35' 30.13" E11 10' 33.36" - End of break-in period. You can guess the rest. BMW CCA
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Old 05-10-2013, 06:03 PM
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Kamdog Kamdog is offline
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My indy says to change the sensor with the pads, it is just good practice to do so.
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Old 05-10-2013, 09:56 PM
chopin1012 chopin1012 is offline
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Re: Help with brakes 335xi

You must change the sensor every pad change and then reset the mileage indicator. Unlike the E46, the E90 sensor has more than one wire that gets worn through by the brake pads; that's how it's able to estimate miles left in the pads. On the E90, even if your brake warning light doesn't come on, you need a new sensor.

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Old 05-11-2013, 08:29 AM
thedonesco thedonesco is offline
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thank you for the info i will buy a new on its only like $25 at the stealers
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Old 05-11-2013, 01:30 PM
thedonesco thedonesco is offline
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Ok so I did the brake sensor change and the light still on any info on how to reset it
Or do I have to take it to BMW
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Old 05-11-2013, 01:35 PM
SuperTerp SuperTerp is offline
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lol I'd have sent you my fronts if you wanted my indy looked at me confused when I paid for fresh brakes and mine were still good over squeaks and weird feelings and also the rust
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Old 05-11-2013, 05:28 PM
chopin1012 chopin1012 is offline
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Re: Help with brakes 335xi

I don't remember off the top of my head, but you can search here or Google and find instructions.

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Old 05-16-2013, 07:26 PM
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Zeichen311 Zeichen311 is offline
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Quote:
Originally Posted by chopin1012 View Post
Unlike the E46, the E90 sensor has more than one wire that gets worn through by the brake pads; that's how it's able to estimate miles left in the pads.
This is partially incorrect. The CBS system estimates pad usage computationally, using the expected service life of OEM pads and integration of braking force, wheel speed, brake disc temperature (also determined by a computational model) and other variables over time. The sensor does not contact the rotor or wear through until the pad material wears to the minimum thickness.
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2011 335xi Individual 6MT - Azurite Black Metallic / Oyster & Black / Anthracite Maple + all the good stuff
 
N47 35' 30.13" E11 10' 33.36" - End of break-in period. You can guess the rest. BMW CCA

Last edited by Zeichen311; 05-16-2013 at 07:42 PM.
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