W218 CLS550 Shaking when hard braking - Mercedes-Benz Forum
 
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post #1 of 2 (permalink) Old 04-29-2019, 01:27 PM Thread Starter
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Unhappy W218 CLS550 Shaking when hard braking

2012 CLS550 W218 with 50K miles on it. Magnificent vehicle to drive! From High speeds when braking hard (from 120 down to maybe 70 MPH) I was experiencing a shudder on the steering and and loud whirring noise. I figured time for Rotors and Pads front and rear so I ordered the Extreme Pads (Ceramic and Carbon Fiber) and Cross Drilled and Slotted Rotors by Power Stop through Jegs.com.

New Rotors and Pads installed and roughly 200 miles driven to bed pads in. Got on the highway this past weekend and was accelerating to about 130MPH when someone pulled in front of me and I hard braked from around 125 down to 70MPH ... I was horrified that I experienced violent shaking in the steering and a wicked vibration through the whole car, even worse than before. I'm hoping I just received a bad batch of Rotors.

What next? Wheel Bearings - or - Front Tires? Since the Rotors and pads are new I'm finding it hard to believe they are at fault.

Any suggestions? Thank You.

I'm new to the forum but not to fast cars. I'm a Master Mechanic and have owned BMW's, Porsches, Mercedes SL's and back in the day Alfa Romeo's.
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post #2 of 2 (permalink) Old 04-30-2019, 07:08 PM
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Get the alignment checked. A slightly bad toe alignment can cause this.

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