alix_m

Hi All,

I just purchased a 2012 GLK350 and am noticing significant shaking when i brake at 60mph+. I had the car inspected and also had the dealer do a quick look over and they said the brakes are fine. After doing a little research, I found that the problem could be rusty rotors, and quite possibly even a clean spot where the pad sits making the braking feel uneven.(The car had been sitting on the lot for a month or 2 before I purchased it). The steering wheel doesn't shake which makes me think maybe it's just the rear brakes. It also feels like a back and forth pulsing/shaking, not like a side to side motion.

I also spoke with some friends who do a lot of work on their own cars. They mentioned it might be warped brake rotors.

My questions are:
A. If the rotors are rusty, will it wear down after driving and braking? I've had the car for a week and have not noticed a difference yet.

B. If it is a warped rotor/rotors how much is that to fix and should I take it to the MB dealer for service or can I just go to a decent garage?

C. I'll be driving out of state next week (about 700 miles) and am concerned for my safety! Is this something I need to have fixed before I go?

Thanks so much!!

howardx

My 2010 GLK has warped front rotors and whenever I fix it, it comes back within a month or two. I am too lazy to go back to the shop so I just ignore the shaking. Been driving on warped rotors for 5 months now.

bop11

Do you have the service history on this vehicle? how many miles? Rusty rotors usually clean off within a mile or two and do not usually cause this type of problem. All rotors will get rusty if the car is not driven for a couple of day or even hours and it is rainy. If the car sat for a month it still should not have this problem. The fact that it is front to back and not side to side points more to struts and bushings.

rmfnla

This cannot be a good idea.

Try non-OEM rotors or something, but brakes are the one thing you want to work perfectly...

skr

My 2010 was doing the same thing, the rotors are warped. The stock rotors have a high iron content and they tend to warp & rust easily. Dealer said they don't recommend resurfacing these rotors just replacement. When my rotors warped I still had a lot of life left in my pads, so I continued to drive it for 15K miles before I changed them. Other than the vibration I didn't sense a safety issue. I just changed the Rotors & Pads on mine and they feel so much better now. I went with an aftermarket setup that I'm really happy with. You can see the details of that in this thread:

https://mbworld.org/forums/glk-class...-calipers.html