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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > Rear Brake Sensor
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      08-12-2019, 06:34 AM   #1
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Rear Brake Sensor

My rear brakes are squealing like crazy so I want to change the pads. The car still tells me I have 20k miles left on them. I was wondering if I could reuse the sensor or would I have to get a new one? Or is there a fix to stop the noise other than changing the pads? The brakes have plenty life on them and the sensor hasn't tripped, but I can't take the squealing anymore. Any input would be appreciated. Thanks
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      08-12-2019, 06:44 AM   #2
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Squeal is usually caused by inadequate lubrication of the pad to caliper mating surfaces. A sensor only has to be replaced if tripped. The 20k miles remaining is only a guestimmate, and not a very good one at that. You must visually confirm the pad condition. My experience with that:
http://f30.bimmerpost.com/forums/sho....php?t=1471617
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      08-12-2019, 06:49 AM   #3
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Quote:
Originally Posted by Billfitz View Post
Squeal is usually caused by inadequate lubrication of the pad to caliper mating surfaces. A sensor only has to be replaced if tripped. The 20k miles remaining is only a guestimmate, and not a very good one at that. You must visually confirm the pad condition. My experience with that:
http://f30.bimmerpost.com/forums/sho....php?t=1471617
Thanks for the input. I'm going to pull them apart just to make sure. The sensor hasn't tripped but I think I will upgrade to some better pads. When I took it to the dealer, they told me "that's what factory pads do." I wasn't content with this answer and think I need to upgrade to better pads
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      08-12-2019, 06:54 AM   #4
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Pads don't make noise, metal to metal contact does. There's nothing wrong with the OEM. Your dealer response can be translated as 'we don't want to bother taking the time to fix this'. I'm sure he'd be happy to change them, for $300 or more.
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      08-12-2019, 06:55 AM   #5
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Quote:
Originally Posted by Bnks View Post
Thanks for the input. I'm going to pull them apart just to make sure. The sensor hasn't tripped but I think I will upgrade to some better pads. When I took it to the dealer, they told me "that's what factory pads do." I wasn't content with this answer and think I need to upgrade to better pads
Which version of brakes are actually installed? Copper pasts on the back of the pad and it will be quiet until they really need to be replaced.

15 Brake pad paste 3G 2 83192158851

https://www.realoem.com/bmw/enUS/sho...diagId=34_2312
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Last edited by BWbimmer; 08-12-2019 at 07:00 AM..
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      08-12-2019, 12:17 PM   #6
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Update: Purchased some new brake pads and the squealing is gone! The factory pads I pulled off still had 80% pad left. Not sure why they squealed so much but after dealing with it for 8 months, it's finally nice to brake and not sound like a dump truck. Now when people turn their heads it'll be because of my exhaust, and not my loud ass brakes!! 🤣🤣 Thanks for all the input!
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      08-13-2019, 01:01 PM   #7
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Bentley manual does a great job of detailing where to dab the brake paste. Surprisingly, not on the back of the brake pad.

Did mine about 5,000 miles ago, front and rear, using their approach.
Not a peep.


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