Loading ...
Sorry, an error occurred while loading the content.

5354RE: [bmw e28] Re: ABS query

Expand Messages
  • Gary Apps
    Feb 10, 2010
      The [private] shop to which I took my car claims to be a professional brake
      shop, so I would hope that they checked the wires to the sensors. They had
      me replace both rear tone rings and gave me the 'needs a code' story. I have
      a good rapport with the local dealership, but this job was done by the
      private garage at the recommendation of a friend. I'll see what I can figure
      out and may be looking at your by-pass technique if all my cheapie options



      From: bmwe28@... [mailto:bmwe28@...] On Behalf
      Of doug
      Sent: Wednesday, February 10, 2010 10:10 AM
      To: bmwe28@...
      Cc: garyapps@...
      Subject: [bmw e28] Re: ABS query


      My experience (85 e28 535) is that the sensor "gears" can be effectively
      cleaned with a wire brush, as long as they haven't rusted away.

      The failure mode is usually corrosion inside the poorly sealed hole in the
      wheel hub that holds the sensor, which gradually compresses the metal sensor
      cans until they fail. Getting them out can be a PITA, so don't expect
      save/clean/repair them.

      BMW has a special tool that plugs into the ABS harness that will measure the
      sensor voltages to identify the bad one(s). I faked that by connecting a
      voltmeter to the abs harness connector and spinning the wheel with the car
      on jack stands. Its hard to get a consistent rotational velocity to compare
      voltages between wheels, but if the sensor is very bad, it should be pretty
      obvious. On the first occasion, I paid an indie mechanic to use the BMW tool
      to identify the bad sensor. You might try that now to get a written report
      to take back to the local shop.

      When replacing the sensors, use RTV/silicone as a sealant.

      The failure mode appears to be exactly the same on the plastic abs sensors
      on my 2000 e39 540i-6 (both rear sensors failed by 65k miles), so don't
      expect any improvement on your next BMW. On the other hand, the newer cars
      are so complicated, you can identify the failed sensor by what other
      functionality stops, e.g. speedo or cruise. Sigh.


      Waterloo, Ontario Canada, eh

      86 951 (https://reg. <https://reg.pcaucr.org/forum/post.jsp?postid=2393>
      01 E320 (W210) 4matic Wagon
      > d.org/forums/w210-e-class/1417557-drl-diy-anybody-do-pos
      00 540i-6 (http:// www.trillium-bmwclub.ca/forum/post.jsp?postid=1916)
      94 855 turbo Wagon (sold in 09)
      85 535i-5 (sold in 07)
      83 944 (sold in 86)
      I apparently only buy cars designated by numbers

      No virus found in this incoming message.
      Checked by AVG - www.avg.com
      Version: 8.5.435 / Virus Database: 271.1.1/2679 - Release Date: 02/10/10

      [Non-text portions of this message have been removed]
    • Show all 4 messages in this topic