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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 04-18-2007, 06:04 AM   #1 (permalink)
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Brake pads and sensor

The brake warning light was came on. Then, I came to shop and changed the front pads and sensor. After it was replaced, the light was still light-up. Then, I took the car for a few miles away, stopped for work. When I came back, turn the key again. The brake warning light had got.

Who knows why the warning light is still light-up initially. Is that any run-in period for the sensor? Or it needs timing for brake fluid running go back to higher level??
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Old 04-18-2007, 08:34 PM   #2 (permalink)
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Probably the shop didn't reset the warning light.
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Old 04-19-2007, 07:43 AM   #3 (permalink)
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Brake pad sensors do not sense the level of brake fluid, they sense the wear on your pads. After new wires are installed, you have to reset the light by turning the key to the "on" position (but not actually starting the car). You leave it there for about a minute and the light disappears.
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Old 04-19-2007, 11:43 AM   #4 (permalink)
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Are you sure they replaced the sensors? If the shop is shady they'll just pocket your money for sensors if they think the sensors look fine. And these shops are usually idiots because they don't realize the sensors work in a fashion where if they ever wear down enough to initially turn on they are toast and HAVE to be replaced.

How the sensor works is it sits int he brake pad at a certain level. Whenever the pad is worn enough it gets down to sensor level and the sensor makes contact with the rotor. They get slid across and then they are on and gone. They must be replaced at this point.



Or maybe it's just your rear sensors/pads.
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Old 04-30-2007, 02:54 AM   #5 (permalink)
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Originally Posted by Hootie
Brake pad sensors do not sense the level of brake fluid, they sense the wear on your pads. After new wires are installed, you have to reset the light by turning the key to the "on" position (but not actually starting the car). You leave it there for about a minute and the light disappears.
Thanks, Hootie, I think you are corrected. I don't remember the reset action. But I turn on the key and start engine as normal. Anyway, it was reseted and ok now.
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