Subject: Corrections and questions Author: davidc (moderator) : member since December, 2003 : 10272 posts Posted on: 2004-06-01 22:37:15

Good eye, Keith. The correct torque is 81 foot pounds, not 49. It's 49 for the rear calipers. I wrote the wrong figure. It's been corrected.

Ditto on the 5mm hex for the ABS pulse sensor.

I cleaned the ABS pulse sensor, which was very dirty. I also cleaned the hole into which it fits by spraying a lot of brake cleaner into it. It ran out the sides of the hub. I wasn't able to get a brush in there, though.

The symptom I'm having is that the ABS light comes on after about 15 seconds of driving. You can hear what I believe to be the left front brake rapidly engaging and disengaging as if the ABS system were pulsing it, then the ABS light comes on and stays on. I was told by others that this is likely caused by rusted teeth on the inside of the hub. I've been thinking about taking the hub off to examine it or replace it. Is that feasible? A new front ABS hub costs $209 from the dealer, before CCA discount. I'd really like to get the ABS working as we've already had one case of burned rubber during braking.

I don't think I'll paint the rotors or calipers this time, though that's a very good idea. Maybe next time.

David Cecil
'02 X5 3.0, 15k miles
'97 740iL, 120k miles
'86 735i, 94k miles
'77 320i, 140k miles
'92 325is (rear-ended on I285, gone but not forgotten)

www.e38.org has links for everything about your BMW 7-series automobile

• How to change the front disc brakes on your E23 7-series (long) (pic) (url) - davidc 2004-06-01 02:27:32 (10633 views)
  • Follow-up: Painting the calipers and rotors (url) - davidc 2004-06-09 17:43:49 (807 views)
  • Nice write-up and pictures. - kff 2004-06-01 16:15:44 (557 views)
    • Ok, you inspired me to take it all apart again. - davidc 2004-06-03 19:33:58 (524 views)
      • The brake painting project results (url) - davidc 2004-06-03 23:08:14 (628 views)
    • Corrections and questions - davidc 2004-06-01 22:37:15 (609 views)
      • Re: Corrections and questions (pic) - B5M2W8 2004-06-02 11:38:23 (799 views)
      • The pulsing of the brake, is that when you are > - kff 2004-06-02 11:37:13 (618 views)
        • It happens when using the brakes shortly after putting the car in gear. - davidc 2004-06-02 13:57:21 (548 views)
  • great work...i did the rears on my car with the same procedure you use - elmoreandrew 2004-06-01 10:11:56 (516 views)