E-Class (W211) 2003-2009

Brake disc overheating

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Old Jul 26, 2023 | 03:42 AM
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Henri Kekäle's Avatar
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W211 2003 320CDI
Brake disc overheating

My right rear brake disc started overheating a while ago. It started making a sound while braking, and I went to put my hand on it. It was very hot. I’ve done a few test runs with the car, about 7km without braking. The disc was still hot. Now the left side has started doing the same, though it is not as hot as the right side.

What could be the problem? The pads are ok.
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Old Jul 30, 2023 | 01:08 PM
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W212 MY'14 M276-3.5NA @75kMi
new calipers 👍

Originally Posted by Henri Kekäle
My right rear brake disc started overheating a while ago. It started making a sound while braking, and I went to put my hand on it. It was very hot. I’ve done a few test runs with the car, about 7km without braking. The disc was still hot. Now the left side has started doing the same, though it is not as hot as the right side.

What could be the problem? The pads are ok.
this is the textbook reason why brake fluid needs to be exchanged: the water condensation being heavy collects at the bottom of brake lines and rusts the steel pistons in bores.
New calipers + flex lines (F? + B!)

Flush the lines clean before connecting your new gear!!
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