Brake issue?
Thread Starter
Newbie
Joined: Jan 2013
Posts: 7
Likes: 0
From: Toronto, Canada
2009 C300 Sport 4Matic
Brake issue?
I picked up my first Mercedes last Sat, which is a CPO 09 C300 Sport 4 Matic.
When I bought the car, I was told that the dealership insures that brakes and rubber have over 50% to qualify for the CPO program.
I looked at the service history and saw that the tires had been done. The car currently has 40,000 km on it.
I noticed on Sunday that there is a very low rumbling noise when I hit the brakes lightly over 25km/h. It's really quiet, but it kind of feels like that low vibration and sound that you get when traveling on snow or rough road. I didnt notice it on test drive as it was a very snowy day,
Any insights? Could it need new brakes already and the dealer neglected to do it?
When I bought the car, I was told that the dealership insures that brakes and rubber have over 50% to qualify for the CPO program.
I looked at the service history and saw that the tires had been done. The car currently has 40,000 km on it.
I noticed on Sunday that there is a very low rumbling noise when I hit the brakes lightly over 25km/h. It's really quiet, but it kind of feels like that low vibration and sound that you get when traveling on snow or rough road. I didnt notice it on test drive as it was a very snowy day,
Any insights? Could it need new brakes already and the dealer neglected to do it?
Senior Member
Joined: Feb 2012
Posts: 369
Likes: 7
From: IA
2018 C63s Coupe 2016 C450 DAILY
usually if its a grinding ,rumbling noise I know for a fact that the pads and possibly rotors need to be replaced. Don't be surprised if they sold it as CPO and it wasn't qualified I've had this problem. just take it in and have them measure it with you present.
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Super Member
Joined: Nov 2012
Posts: 703
Likes: 68
From: Boston Area
2021 Mojave Silver E450, 2024 Black on Black Jaguar F-pace P400, 2011 335d (RIP), 2010 E350 (sold)
I went through this exact situation with my e350. On the E's the pads are 10mm new. Mine measured out at 8mm both front and back (and this with the car having 25k mi). The total pad thickness is 15mm but that includes the metal backing plate so it doesn't count. You are looking for more than 6mm because they recommend replacement at 1 or 2mm. This is assuming that the w204 uses similar thickness pads.
MBWorld Fanatic!
Joined: Mar 2008
Posts: 3,714
Likes: 56
From: 1 hours drive north of Sydney Australia
2007 W204 220CDI Classic Sedan
FYI :My disc original thicknesses & wear limits. :-
Front - Ventilated :-
Original = 28 mm
Minimum before repair = 26.5mm
Minimum limit = 26mm
Max runout = 0.12mm
Rear- Solid.
Original = 10 mm.
Minimum before repair =8.8mm
Minimum limit =8.3mm
Maximum disc runout =0.15mm.
Front - Ventilated :-
Original = 28 mm
Minimum before repair = 26.5mm
Minimum limit = 26mm
Max runout = 0.12mm
Rear- Solid.
Original = 10 mm.
Minimum before repair =8.8mm
Minimum limit =8.3mm
Maximum disc runout =0.15mm.
MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
Likes: 6
From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
I picked up my first Mercedes last Sat, which is a CPO 09 C300 Sport 4 Matic.
When I bought the car, I was told that the dealership insures that brakes and rubber have over 50% to qualify for the CPO program.
I looked at the service history and saw that the tires had been done. The car currently has 40,000 km on it.
I noticed on Sunday that there is a very low rumbling noise when I hit the brakes lightly over 25km/h. It's really quiet, but it kind of feels like that low vibration and sound that you get when traveling on snow or rough road. I didnt notice it on test drive as it was a very snowy day,
Any insights? Could it need new brakes already and the dealer neglected to do it?
When I bought the car, I was told that the dealership insures that brakes and rubber have over 50% to qualify for the CPO program.
I looked at the service history and saw that the tires had been done. The car currently has 40,000 km on it.
I noticed on Sunday that there is a very low rumbling noise when I hit the brakes lightly over 25km/h. It's really quiet, but it kind of feels like that low vibration and sound that you get when traveling on snow or rough road. I didnt notice it on test drive as it was a very snowy day,
Any insights? Could it need new brakes already and the dealer neglected to do it?
Since it has a warranty, let the dealer sort it out.
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Thread Starter
Newbie
Joined: Jan 2013
Posts: 7
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From: Toronto, Canada
2009 C300 Sport 4Matic
Brakes
I took the car to the dealer today. I just picked it up and was told that the brake noise if from some oxidation that's build up on the discs from moisture, as the car was sitting outside on the lot for 2.5 months.
I was told that the oxidization was go away as I drive the car and the noise will stop.
Does this make sense?
I was told that the oxidization was go away as I drive the car and the noise will stop.
Does this make sense?
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MBWorld Fanatic!
Joined: Mar 2008
Posts: 3,714
Likes: 56
From: 1 hours drive north of Sydney Australia
2007 W204 220CDI Classic Sedan
Try 2 or 3 hard braking stops ( safely) to see whether the brakes will bed in .
Take a look at the disc itself with a torch to see whether there is any build up/rust .
If the noise is still there take it back to the dealer & be firm that you need a repair.
Take a look at the disc itself with a torch to see whether there is any build up/rust .
If the noise is still there take it back to the dealer & be firm that you need a repair.
MBWorld Fanatic!
Joined: Jan 2009
Posts: 5,113
Likes: 57
From: Southwest USA
Another round of ICE
MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
Likes: 6
From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
I took the car to the dealer today. I just picked it up and was told that the brake noise if from some oxidation that's build up on the discs from moisture, as the car was sitting outside on the lot for 2.5 months.
I was told that the oxidization was go away as I drive the car and the noise will stop.
Does this make sense?
I was told that the oxidization was go away as I drive the car and the noise will stop.
Does this make sense?
Drive it.
