Off Topic > Other cars

2015 ML 250 - Rear Brakes

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zak:
I have owned this bluetec diesel since new and am approaching 90K miles.
I average about 100 miles per day with 90% being high speed hi way driving.
It is my daily driver and I drive it spiritedly so I am not surprised that the truck eats up brakes.

But the odd thing to me is that I have had to replace the rear brake pads and disks twice and the front pads and disks only once. My experience has always been that the front brakes wear first because that was where all the stopping pressure is, but that has not been the case here.

Also, this is the very first time that the brake pads and disks wore out at the same rate.
Usually the brake disks lasted at least 2 brake pad changes.

Is this the new normal now? Or am I off base on this?

jz

dpreston Virginia:
I think you have posted your question to the wrong Mercedes site.
This is the site for this question:
https://mercedesforum.com/forum/

MikeSimon:

--- Quote from: DPreston on March 18, 2019, 19:00:37 ---I think you have posted your question to the wrong Mercedes site.
This is the site for this question:
https://mercedesforum.com/forum/

--- End quote ---

O.K., he may get an answer faster there, but at least..this section here says:

Other cars
Discuss all other cars here...

MikeSimon:
O.K. I will give it a shot..

zak:
I had the same issue on my Audi Q5 and the dealer service rep sent me this:

Another factor that has accelerated brake wear (especially rear brake wear) in certain late model vehicles is the change to electronic brake proportioning. The proportioning valve that normally reduces hydraulic pressure to the rear brakes has been eliminated so the rear brakes will handle a higher percentage of the brake load and be more aggressive. The antilock brake system performs the job of brake proportioning by keeping an eye on how the rear brakes are behaving. If the rear brakes start to lock up when braking hard, the ABS system kicks in and cycles pressure to the rear wheels to prevent them from skidding.
 
This approach helps the vehicle stop in a shorter distance, but also increases rear brake wear dramatically.  This means the rear brakes will often wear out before the front brakes.

What did your service guy tell you?

Chris_ATL:
Another thing to add...

Rotor tech hasn't really evolved a lot, but brake pads HAVE... whereas it was common to change pads frequently, and they were 'sacrificial', now they last 50,000 to 100,000 miles, which wears rotors more. Another reason to swap out both is cost... Rotors are cheap, and it's a quick swap when doing pads, vs adding hours of labor... On my Audi i believe the OEM rotors were only around $30 a pop

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