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Old 05-21-2003, 08:01 AM
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Join Date: Jun 2002
Posts: 30

recently the brake pads on my 1989 300 E were replaced by a talented friend who has a number of older (than mine) mb's that he keeps in top shape. now sometimes the brakes make a grinding sound at the very end of braking to a stop and fell like they are letting go. also the braking sometimes has a pumping feeling and the abs light will come on for no apparent reason.

any suggestions for repairs would be greatly appreciated. thank you.
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Old 05-21-2003, 08:18 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Somewhat common on many pre-1990 MB's, as faulty ABS sensors in the front will cause this problem.
Sometimes cleaning the debris from the sensors will help as they attract metal particles.
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Old 05-27-2003, 03:23 PM
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Join Date: Jun 2002
Posts: 30
Thank you, M.B.DOC for the tip to clean the abs censors. However, that didn't do the whole trick. At least not yet. Might it take a little while for the fix to work or is there another adjustment that would alleviate the grinding and slipping?
your advice is very much appreciated.
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Old 05-27-2003, 05:10 PM
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Join Date: Jul 2001
Location: SoCal
Posts: 1,303
It may be just coincidence, but more likely your friend did something wrong. This is quite different from a braking system 'failure', so would be hard to diagnose by remote. Ask him to take another look at it.

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Old 05-28-2003, 12:35 AM
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Join Date: May 2003
Posts: 497
Not quite the same car as yours, but the advise within this URL holds true in many cases anyway:

89 300ce ABS
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Old 05-28-2003, 07:59 AM
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Join Date: Oct 2001
Posts: 592
any chance the caliper mounting bolts were not tightened to factory torque specifications? offer this thought in view of the fact that the abs speed sensors are a little on the expensive side so to speak. additionally, was the rotating disc under the abs speed sensor also cleaned?
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