Must have missed this as it was posted a few weeks ago."Most brake pads are equipped with sensors built in to the brake pad material. When a brake pad that's 12 mm thick new wears to approximately 3 mm of pad life remaining, the metal sensor usually becomes exposed and makes contact with the disc causing a squealing sound."
"The brake pads are positioned in the caliper. A metal tab fastened to the pad assembly alerts drivers when the pads have thinned out. As the pads wear down, the tab will rub against the rotor, causing a squealing sound when the brakes are applied. ... If you wait too long, the brakes may begin to grind.”
"Brake pads do a lot of work to stop your car and tend to need the most attention. You'll know it's time to replace the brake pads if you hear - Squealing: This noise is there for you. It’s not fun to hear, but the pads are made to squeal when they are almost worn out. Some cars are equipped with brake pad sensors. When the pad wears down, the sensor touches the brake rotor, and that produces a squealing sound."
These are quotes from various websites addressing brake squealing - unfortunately all brake pads are not so equipped !
Sell it! I bought my 2017 GLC new in late 2016. I drive a lot and have 108,000 miles on it now. They have tried to fix them 3-4 times now and they still squeal when backing up. I have dealt with this for 108,000 miles and Mercedes just kind of chuckles about it now. Get rid of the car before it drives you crazy.I want buy GLC COUPE 260, But very worried appear brake squeaky