Assistance with Brake Calliper!

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MThomas88
Newbie
Posts: 8
Joined: Wed Nov 05, 2025 12:40 am

Hello everyone, I am currently organising some matters, and it appears that the rear brakes are emitting a loud squeaking noise when reversing, suggesting they may have been replaced with non-genuine parts.

I am have difficulty determining the sort of calliper I possess, as the part numbers for the pads varies depending on whether the callipers are constructed from cast iron or aluminium.


Is there a straightforward method to ascertain this without removing the wheel, or would the pads inevitably be composed of cast iron?

I was completely unaware that they would differ!
MercedesMan98
Moderator
Posts: 205
Joined: Fri Mar 20, 2020 8:40 pm

You have not specified the car in question. It is somewhat presumptuous to conclude that all non-MB pads produce squeaking sounds.
NewDavid77
Newbie
Posts: 3
Joined: Wed Nov 05, 2025 1:23 am

A magnet should be accessible to the calliper between the spokes. If it adheres - cast iron. If it fails to do so - alloy.
MThomas88
Newbie
Posts: 8
Joined: Wed Nov 05, 2025 12:40 am

It is the C250, and indeed, it was a significant assumption; nonetheless, as time progresses, I am uncovering that many installed components are not authentic, leading me to presume that the pads and similar parts are also non-genuine.
MThomas88
Newbie
Posts: 8
Joined: Wed Nov 05, 2025 12:40 am

Valid observation. Salutations!
MBcarOWNER
Moderator
Posts: 151
Joined: Fri Sep 13, 2019 2:15 pm

Depending on the model year of the C250, if it emits a squeaking noise in reverse and is equipped with shoes within the rear disc for the handbrake, it may just require cleaning. Merely a contemplation.
matthewlightburn
Moderator
Posts: 144
Joined: Wed Nov 20, 2019 11:45 pm

Does the squeaking occur exclusively in reverse or only when the brake is used in reverse?
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