Mike R.

I have a question for all of you brake experts out there. How many brake pad wear sensors are there on a 2010 ML? If there are fewer than four, on which pads are they installed? Thanks much.

zemun1234

Usually it is installed on passenger side (on each wheel - in total: 2). In general, you can put on any side but when I have changed my pads, I found it there.

sheepdog8

Do they need to be replaced every so often? Or only if a code is displayed or quit working?

davey one

The sensor wears with the pads, so change with pads[

sheepdog8

Great, thanks, I did see they're pretty cheap anyways.

zemun1234

In general, once you are changing pads they are going be in good (working) condition but it is better to change it. If you go to local shop, they are going save it and reduce your bill for ~ 15 $ but I think it is always good to change it.

davey one

True if you change the pads before the light comes on,once the light is on they are wearing down.

paracutin

No they don't. They don't wear at all. Once the pad wears to a pre-determined level the sensor touches the rotor completing the circuit and activating the message letting you know it is time to change your pads.

davey one

YES THEY DO!!!!! once they touch the disk to send message they continue to wear until the pads are changed,

paracutin

No kidding. I guess you could call it wear. However, the sensors are not designed to wear like the pads are,

davey one

Well what would you call it when it rubbing against the rotor?,

iankayem

You are both right. Once the pad wears to let the sensor touch the disc, the sensor will wear.

However it is a spring so it does not get loaded up like the pads when you brake, so the sensor wear is absolutely minimal.

Moto One

If you change the past before the light comes on the sensors could be used but generally they're brittle and will break in the process of trying to remove them from your pads.
I just installed new rear pads and they came with new sensors.

Mark

hiend

Please any one, let me know how much coast set of OEM frontpads + set of OEM sensors, also what the OEM part number for set of pads.ML350, 2011. Thank you.

chikoo

When do the sensors activate? I have mine showing "BRAKE WEAR" but the brakes seem fine visually. 40% remaining.

sheepdog8

The brake pad wear sensors should only make contact and send the signal when the pad material left is very thin, about 10% I'd guess. Did u check the pads at all 4 wheels?

chikoo

So my dealer calls up and tells me that my outer pads look fine but inside are worn out. Seriously? how does that happen?

N4HHE

The calipers are not properly floating in their carriers. When brake is released the piston releases as it should but the entire caliper is cocked/wedged/stuck leaving the outer pad to drag on the disk.

chikoo

Good lord. So will that be covered under warranty service?

N4HHE

I was thinking the opposite was happening when I replied earlier but no matter this is one of those situations where the answer is the same either way.

Inner pads are wearing because only the inner pad is being applied to the rotor. Any time inner or outer pads wear more than its mate the caliper is not properly floating.

As to whether its covered under warranty, it could go either way. If you are a regular customer of the service department then it should be covered because it is not the way one would like brake pads to wear. On the other hand it is an example of exactly why one inspects brakes periodically rather than wait on the brake pad sensor to speak.

As for brake pad sensors I'm a fan of GM's low tech solution of 30 or 40 years ago: a metal feeler which squeals when it contacts the rotor. Costs almost nothing. Dependable as a rock. Obnoxious enough to make careless drivers seek a remedy.

Garrett@Oscaro

Front pads are $94.37: JURID Disk Brake Pads from Oscaro MB Part # A1644200820

Front wear sensors are $5.25: Bowa Disk Brake Wear Sensor from Oscaro MB Part # 2205401517

chikoo

I just ordered the Akebono Euro pro ceramic from Rockauto, sensors included.


2010 MERCEDES-BENZ ML350 3.5L V6
AKEBONO EUR1122 Brake Pad $ 53.89
AKEBONO EUR1123 Brake Pad $ 78.79
Discount $ -6.63

chikoo

And the set is here. Now time to get it installed.

chikoo

So I get to my neighborhood carcare center and ask them to replace the brake pads. They do what I told them to do, and they also returned the old pads. The fronts are indeed 50% left, and the rear about 35% left.
Fk the MB dealer. I am not going there except for oil changes.

Incidentally I think these brake sensors are the stupidest ideas ever to come out of German engineering. No wonder the Japanese never adopted it. The brake dust accumulates in the sensor slot making connections that should never have been and producing erroneous results.
FK.

chikoo

O Lord..help thy MB owners. I have never come across such gullible and ignorant owners at other car forums

http://www.benzworld.org/forums/w163...ml#post2516829