Strange noise from front right area
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Newbie
Joined: Jul 2023
Posts: 2
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From: Birmingham, Alabama
2012 GL 550 4Matic with AMG Sport package
Strange noise from front right area
Hello all, first post so be gentle, here goes. I have a 2012 GL 550 4matic and just this weekend i performed a brake pad replacement on this vehicle. Once finished and test driving i heard a noise from the front right when the brakes were applied. It sounds like popping metal along with slight squeal. The sound is heard only when breaking, when in motion its quiet and it seems to break better than it did with the old pads. I even did the new pads a second time yesterday just to see if i missed something and everything looked good to me. I did use brake lube on the moving parts but it did not help. Also, the rotors are within tolerance with no visible scarring on them. Any advice from fellow MBenzers is appreciated. Thanks
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Joined: Feb 2008
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1987 Porsche 928 S4, 2009 Mercedes E350, 2011 Mercedes GL450, 2003 Mercedes ML350
Did you separate the slide caliper at any point when replacing the pads and rotors? Typically a loose slide caliper bolt can cause a clunk or this too. Not sure what your mileage is but I've come to notice some components like steering rack bushings and sway bar links fail simultaneously after suspension work.
Thread Starter
Newbie
Joined: Jul 2023
Posts: 2
Likes: 0
From: Birmingham, Alabama
2012 GL 550 4Matic with AMG Sport package
Hi Andy, thanks for replying. My mileage is 119,000 and to be sure I understand your question about the caliper slide, I just removed the caliper to get to the pads and the brake pad sensor, after removing the two caliper pins the whole piece just works back into your hand so to speak, reset the pistons, installed new pads and just reversed my steps in assembling the caliper back into its "frame" and put this, not sure what it is called, but this piece fits tight against the outward facing part of the caliper. You can actually see this piece when looking in from the wheel. Thank you for your time.
