Brake disc issue?!

merckdan

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Jun 6, 2019
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Your Mercedes
C-Class Coupe 2016 C220d PremiumPlus
So last month (7th Dec) I bought a new set of brake discs and pads from Mercedes - cost just over £300, for my W205 Coupe. I got them fitted at a local garage near me. From the evening I picked the car up the brakes didn't seem right - the brake pedal would slightly shake when braking at higher speeds i.e. on the motorway. I thought it might just be that they're soft as they've just been changed but it didn't go away and started getting worse. I took the car to the garage yesterday and they've said there is a slight 'deviation' in them so basically they're warped.

Now garage is saying could be due to faulty brake disc and I should contact MB to have a look. I called MB and they're saying they can take it in and look at it - if its a fault of their part then they will replace for free but if its not their parts fault then I will get charged £55 diagnosis fee for 30 mins (and then obviously however much to replace the discs if I want them to do it).

I honestly now don't know what to do - in my head I'm thinking Merc will say yes the discs need replacing but its because they weren't put on properly or something so I will just be more out of pocket. Shall I buy another set of MB discs for £150 or wait 2 weeks and take it to MB to look at?

Any advice?
 

mioba

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Feb 19, 2006
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Your Mercedes
W124/E200, W220/S320CDI, W205/C200, W251/R350CDI 4Matic
Your garage is washing his hands of the sitution tbf, bite the bullet and get another garage to have a look, but they will still you charge time like MB will. Bite the bullet get MB to have a look, could well be they say wrong paste was used, mounts not cleaned properly etc,

why would you shell out another 150, it could be the brakes are fine and they were not correctly fitted....

replacing disks and pads is not like changing a fuse, things need to be cleaned up and lubricated, some garages just whip on and off and thats where the problems start.
 

00slk

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Your Mercedes
2002 SL55 AMG, 2005 E320 CDi, 2014 SLK250 CDi
If the hubs are not cleaned thoroughly ie spotlessly clean from any debris the disc will not seat true on the hub, this will cause your symptoms.
I know because I did a disc change on one of my past Mercedes and had the same issue. After removing the disc's and cleaning properly I had no problem ;)
 

moj91

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Jul 12, 2013
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Location
Northamptonshire
Your Mercedes
W213 E400d-T, W204 C250CDI-T, W220 S320CDI (AMG Kit), W168 A170CDI, W210&W124 OM606...
I know on the W213 it is essential that the wheels are fitted with the correct wheel bolt torque pattern, or the hubs can be damaged by them being bent slightly (i am equally as amazed and concerned too) which in turn throws the brake discs out of alignment (run-out) causing judder.
Good chance your garage has just impact gunned the wheel bolts back on and thrown the run-out out on the discs. As the pads 'catch' them on rotation, more pad material is deposited, causing spot heating and then the judder effect is multiplied.

You may be able to reduce the issue by having the wheels removed, discs removed and checked for clean install, refitted with correct procedure and wheel bolt torquing procedure and then test drive for a couple of days. I wouldn't trust the fitting garage though. If the discs still run out and the install was ok at that point you've got to prove to MB that they are not dead-flat (a challenge) or get the discs cut straight on the car with a run-out machine (i forget what that is called, and only a few garages have one) but that might be cheaper than fitting new discs.
 
Last edited:

DSK

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Your Mercedes
CLS 320 CDI, S350 Bluetec
Another vote for poor fitting practice from experience.


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