Where do the 98 and 99 E300 have brake wear sensors: on all four corners or just fronts and one of the rears?

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

According to the EPC for my 98, which is equipped with BAS and ASR but not ESP and obviously not 4Matic, there is a wear sensor listed. However it is qty. 1 so that means it's only on 1 wheel. I've redone the front brakes on my 98 and it has sensors on both front wheels. I haven't been into the back brakes on the 98 yet so I had to look in EPC for that.

The single sensor on only one side is also present in my wife's W164, it only has one on the right front and one on the right rear.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

I think it was a weird arrangement, like two up front and one in the rear. Mine were in good shape so I pulled them out of the old pads and installed them in the new ones.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

3 sets like Evan said. Both fronts and the drivers rear IIRC.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

my 2000 model year has one sensor on the rear passenger side only but has one each on the front axle.

I have seen an older E320 (97 I think) - which had one sensor each on the rear axle too.

Best just replace them when changing the pads, no need to miser out on a 1 or 2 dollar part - It usually has broken up when I tried to reuse it.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)