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Old 02-03-2019, 05:22 PM
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Join Date: Dec 2018
Posts: 14
How many brake pad sensor are there

I was checking the brakes on my 2003 E320 that just turned over 98K miles. I've got a "BRAKE", - Brake Service, on my dash.

My brake pads in the front look great and the pads on the rear are less than halfway, so I'm good.

My question is now, How many brake pad sensors are supposed to be there? I have a sensor on both front pads but there is only one sensor on the passenger side rear brake pad. No sensor is on the drivers side rear pad.

Is that normal to have two in the front and one in the back?

Is there a brake sensor in the cars computer to tell you to check your brakes due to mileage?

My Range Rover check engine dash light came on at 82,500 miles. But I found out that the system just sends a reminder at 82,500 miles, nothing is wrong, it's just a reminder.

Does Mercedes have a mileage reminder other than "Service D" is due?

Thanks in Advance

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Old 02-03-2019, 05:50 PM
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Join Date: Jun 2000
Location: Eastern TN
Posts: 20,816
How’s the brake fluid level?

I’m not sure for your car in particular but I read later cars have fewer sensors.

If your car has SBC it might be telling you that you’re aprocahing the count limit. At some point the SBC alert turns red. There’s an SBC recall to check in case it’s an SBC issue.

98 E320s sedan and wagon
02 C320 wagon
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Old 02-05-2019, 08:51 AM
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Dropping the car off at the dealer this morning, to check on the "Grey" brake warning.
I'll post his results on it's return home
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Old 02-05-2019, 10:57 AM
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Location: TX
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Its normal to have one rear and two front sensors. But best get that checked as 2003 E320 would be an SBC car.
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)
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Old 02-06-2019, 01:47 PM
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Great News

I just got a call from the Mercedes dealer, and the SBC needs to be replaced and the service manager said every cent would be covered, not cost to me!!!

Now just waiting for the parts to arrive at the dealer.
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Old 02-06-2019, 03:33 PM
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Location: Southeastern PA
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TheBishop, as far as the number of brake pad wear sensors on a given model year MB the newer the vehicle the fewer brake pad wear sensors. Our 1995 E320 has a wear sensor on each of the 4 front brake pads, and as I recall there is one wear sensor per 2 rear brake pads. As I recall our 1998 E320 has a wear sensor on one of the inner front brake pads and a wear sensor on one of the inner rear brake pads. I chalk it up to production cost-savings.
Fred Hoelzle
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Old 02-06-2019, 04:54 PM
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SBC was enough of a problem that the dealers will now do free repairs for 25 years.
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Old 02-09-2019, 01:11 PM
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Join Date: Dec 2018
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Picked up the E320 this morning. Everything is back to normal because Mercedes replaced the SBC unit for free under the extended brake system warranty.
Back in 2015 Mercedes replaced the brake reservoir and parts on the E320. My cost was about $1,600. At the time we didn't know about the new brake coverage. When we got the notice in the mail from Mercedes about I called the dealer and he said all I needed was the canceled bank check that I paid with.
Two weeks later I got a check from Mercedes for $1,600.

Safe braking system again
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Old 02-10-2019, 10:32 AM
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Old 02-10-2019, 12:23 PM
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My 04 has brake wear sensors at all 4 wheels. The sensors on one side are triggered at 50% and the other side at 80 or 90% wear.

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