Quote:
Originally Posted by TimX53d
I checked the error again.
"Brake pads worn
Have them replaced by the nearest
BMW service"
I have completed a visual inspection of the brakes and there is plenty and I mean plenty of meat left. I expect the brakes actually have 20000-40000km left on them.
I should also say that the car only has 35000km (21,000mi) on it.
Further thoughts?
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The E70 uses a multiple-stage brake sensor in the pads, unlike the single-stage sensor in the E53. The sensor wears through the nub, that rubs through a thin wire, and an open circuit in the sensor loop causes the brake pad light to come on. There are two separate loops for the E70, in the same sensor, corresponding to two different pad wear thickness measures. The iDrive mileage indicator is driven by these sensor triggers, plus a computer estimate of brake use for interpolation as to life remaining.
I suspect that you have an open circuit in the final step of the sensor, but not in the first step. Thus, the iDrive is estimating lots of life, but the light on the dash is driven by the open circuit for the last stage.
This could be the sensor at the caliper, but I would first check the plug at the end of the sensor wiring harness (opposite end to the sensor). I recall it being in a small junction box on the chassis. I would unplug the sensor there, and plug it back in. I would look for corrosion when I did that. Sensors do not require coding when changed, so you are safe to play with them.
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