Brake Sensor keeps triggering

tomwadek · 02-12-2020, 02:36 PM

Hi Everyone,

I have a 2011 bmw 335i and I have recently replaced the front brake pads, rotors, holding clip, and sensor with dealer bought parts twice.

Each time, after 500 miles or so, the brake wear sensor triggers. After removing the tires and inspecting the parts, the pads look thick and new but the sensor wire is always torn. I have also changed the white clip that holds the sensor in place.

What is going on? Is there a correct way to route the brake sensor wire? I don't understand why it keeps tripping after 500 miles.

thanks in advance!

relative4 · 02-12-2020, 04:59 PM

Kinda hard to say without pics.

tomwadek · 02-16-2020, 08:17 PM

I took some pictures over the weekend. To me, it definitely looks like the wire is getting snagged on something.. possibly the brake caliper hose?

Tambohamilton · 02-16-2020, 11:23 PM

Never seen one of those white clips before. On mine the wire passes through the loop of the bleed nipple cover (between the 2 rubber sheath bits on the sensor wire). I think yours should be routed in front (towards the outside of the vehicle) of the brake hose.

Also, no need to replace the pads and disc again; just replace the sensor.

02-12-2020, 02:36 PM	#1
tomwadek New Member 5 Rep 11 Posts Drives: 2011 BMW 335i Join Date: Oct 2015 Location: ca, USA iTrader: (0)	Brake Sensor keeps triggering Hi Everyone, I have a 2011 bmw 335i and I have recently replaced the front brake pads, rotors, holding clip, and sensor with dealer bought parts twice. Each time, after 500 miles or so, the brake wear sensor triggers. After removing the tires and inspecting the parts, the pads look thick and new but the sensor wire is always torn. I have also changed the white clip that holds the sensor in place. What is going on? Is there a correct way to route the brake sensor wire? I don't understand why it keeps tripping after 500 miles. thanks in advance!
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02-12-2020, 04:59 PM	#2
relative4 Major 612 Rep 1,272 Posts Drives: '08 335xi E90 MT stage 1+ Join Date: Feb 2019 Location: Denver, CO iTrader: (0)	Kinda hard to say without pics.
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02-16-2020, 08:17 PM	#3
tomwadek New Member 5 Rep 11 Posts Drives: 2011 BMW 335i Join Date: Oct 2015 Location: ca, USA iTrader: (0)	Update-with pictures I took some pictures over the weekend. To me, it definitely looks like the wire is getting snagged on something.. possibly the brake caliper hose? Attached Images
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02-16-2020, 11:23 PM	#4
Tambohamilton Brigadier General 3069 Rep 3,921 Posts Drives: E91 330d Join Date: Apr 2019 Location: Herefordshire iTrader: (0)	Never seen one of those white clips before. On mine the wire passes through the loop of the bleed nipple cover (between the 2 rubber sheath bits on the sensor wire). I think yours should be routed in front (towards the outside of the vehicle) of the brake hose. Also, no need to replace the pads and disc again; just replace the sensor.
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