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Discussion Starter #1
I don't post often, as my 2006 SLK350 seems to be a pretty solid car. But I recently replaced the brake pads on all 4 wheels. I replaced the front ones, and drove ~ 2 weeks. Then I replaced the rear ones. Then the brakes started squealing at very low speeds. Like metal-to-metal. I did not turn the rotors or replace them - maybe that's the problem. Dunno. Anyway, the squeal is coming from the FRONT per my wife's ears. I cannot tell. I've taken all 4 wheels off and checked everything, but all looks perfect. There are NO wear-bar indicators, so it's not something that simple. Of course I don't hear them at higher speeds, but they might be squealing at higher and I just can't hear it. But I never hear the squeal until I am almost stopped at 2-5 MPH.

I've check fluid, brakes, all bolts, etc, so I don't know what else to check. I've done searches on here, and even rode in reverse 10-15 MPH and braked hard, and that seemed to help a little, but not completely.

I can't stand having such an expensive car that sounds worse than anything else I have ever owned.

Anyone have any other ideas? New rotors? Short of having someone steal this thing?
 

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Did you put enough "lube" on the back of the pads where they touch the caliper pistons?
 

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High performance brakes often do squeel, especially if they aren't being worked hard. The pads get glazed.

In the good old days there used to be anti-squeel shims that needed a smear of copperslip, which I've typically applied to the back of most pads when I've fitted them. That said, the last time I changed pads on a car was a couple of years ago on a VW Sharan. The pads had an adhesive backing to stop them from squeeling. Had to peel off a protective layer before putting the pads in the caliper.

I don't know the details of the 350 brakes (or my 200 brakes for that matter) as I haven't worked on them.

As for not changing the rotors; on our 200, it's the rotors that are wearing out first! Still plenty of meat on the pads, but the rotor are getting quite heavily lipped. They will get swapped out in the spring, if not before.
 

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Never tried it yet , but I was told of a trick to get rid of brake squeaks , which is to place a piece of cardboard sheet between the pad and the piston ??
 

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Discussion Starter #5
Did you put enough "lube" on the back of the pads where they touch the caliper pistons?
Thanks for the replies. I can't remember doing this step. I'll be checking this weekend to find any points that metal meets metal and will start with this idea.

Thanks again.
 
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