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BMW 3-Series (E90 E92) Forum
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Strange Brake/Wheel Combo?
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08-07-2020, 04:36 PM | #1 |
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Strange Brake/Wheel Combo?
I took my '07 328xi Wagon in for a brake fluid flush/fill today at a local BMW specialist. They got it up on the lift and then pulled me back to the car to explain why my service light may have been triggered.
Apparently the wheels had rubbed/cut through the sensor. I had replaced my front rotors, pads, and sensor with the Zimmermann/Akebono (34116854998KTF9) kit from FCP back in May. Apparently the sensor must be slightly different than OEM. The shop manager said he couldn't understand why there was so little clearance between the calipers and the inner surface of the wheel/rim and it wasn't something he's seen before (except on this car years ago when the previous owner brought it in for brakes). Everything is stock, running 16 inch 156 alloys. There is probably a cm or less of clearance around the inside of the rim to the brake calipers. I though I may have routed the sensor incorrectly, but there's really nowhere else for it to go. He suggested getting a OEM sensor and seeing if that made any difference. Anyone else have any experience like this? I've now got the annoying red triangle warning lighting up, along with the brake service light. I'm not sure I can clear this, without replacing the bad sensor...? |
08-09-2020, 03:49 AM | #2 |
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Drives: 2008 E92 328xi
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You can disable the sensor. It's bad anyway so. Just cut off the sensor head and strip the two wires, then twist them together.
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08-09-2020, 11:41 AM | #4 |
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I wouldn't recommend bypassing the sensor. That was okay practice for old BMWs that did not have the "smart" (dual-stage) CBS brake pad wear system. The E90 dual-stage system looks for the 1st-stage sensor wear event so the CBS can then calculate and predict the eventual pad replacement mileage.
I can't speak directly to the xi version, but for the RWD E9X the front pad sensor wire harness is supposed to come out of the inner pad and clip into the rubber bleed screw cap to secure it at the caliper; there is a plastic molded section on the sensor wire harness to keep the wire in place in the rubber cap loop. The the wire harness rubber grommet clips into a hanger on the front strut, then it clips into the junction box on the frame wall. Reviewing Realoem.com, the xi E91 uses a different pad sensor (14) than the RWD version, and it comes with what looks like a stand-off clip (16) of some sort. Maybe that is missing on your car and is causing the problem. If everything is stock, brake and wheel wise, and the sensor is aftermarket, either the sensor is incorrectly designed, or the wrong sensor was shipped with the kit, or you somehow routed the sensor wire harness incorrectly. How long ago in miles did you replace the sensor. I ask because if the sensor did not get worn through to the first stage you can replace it and the CBS may not need to be reset. I recommend you buy the correct OE pad sensor and reinstall it and reset the front brake CBS counter.
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
Last edited by Efthreeoh; 08-09-2020 at 11:52 AM.. |
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08-09-2020, 12:57 PM | #5 | |
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I could remember a slight, quiet grinding noise after I replaced the brakes. I think that must have been the wheel scraping the pad end of the sensor. I stated above it was barely a cm of space. It's actually closer to a few mm. Very little clearance. The shop manager said it almost looks like I have bigger brakes, similar to a sport package setup, but smaller wheels. He ran the VIN to check the options package but it didn't list anything out of the ordinary. Oh well, I have an OEM sensor on the way. I'll try again... |
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08-10-2020, 11:51 AM | #7 |
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