Hi, I have a 86 MB 420SEL. Just changed the brakes yesterday with aftermarket pads and rotors, but here is my problem.
I did not know that there were brake pad sensors on this car, so I did not change them. Now the abs light on the dash stays on all the time!! How do I fix this?
I don't have a service manual, and cannot find one.
Any help is appriciated
kris

Replace them, tape them up, or cut them off. Your choice.

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1989 300E 144K

Are you sure it's the ABS light? And not the brake lining light? This could be an entirely different problem...

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

yes its the abs light, comes on sometimes and sometimes it does not.
kris

It's probably an ABS system sensor, not a pad wear sensor issue. The ABS sensors interface with slots on the inside of the front rotors, and replacing the rotors may have disturbed them. Check also to see that the wires are properly routed and clipped in at the right places, and the insulation isn't cut or damaged.

When u replaced the pads u might hit the ABS sensor cable. First locate them and try to clean them and make sure they are connected properly, otherwise install two new ABS sensors. I recommend u to change them even if they r working fine. After arround 10 years they must be replaced in order to function properly.

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Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D

380SE 1984 <------- Totaled by flipping accident
300SE 1988 <------- Sold
Volvo S70 2000 <---- 4 family
Opel Omega 2002 <-- 4 family
560SEC 1989 <------ Sold
560SEL 1990 <------ Sold
560SEL 1991 <------ 4 my mother
560SEL 1989 <------ Sold
600SEL 1992 <------ Current

http://search.ebay.com/_W0QQsassZkhazenzcc

Typically, the abs sensor gets small metalic particles in the slotted probe. Where do these small metalic particles come from? The Semi metalic brake pads. Cleaning them involves removing the caliper and pads and the hub and rotor. There is a 'tone' wheel on the hub that also gets metalic particles in between the slots.

Here's a link to the W126 service manual.

http://mb.braingears.com/126_DISC2/program/matrix.htm

http://mb.braingears.com/126_DISC2/program/chassis_420SEL.htm

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Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.