Why does the Mercedes GLC260 make a noise when slowly releasing the brakes?
3 Answers
Reasons for the noise when slowly releasing the brakes on the Mercedes GLC260: rusted brake pads/discs, new brake pads. Rusted brake pads/discs: After parking for a long time, especially in humid weather or after rain, some rust or dirt may form on the brake discs or brake pads. This can usually be resolved by driving for a while or by applying butter or special lubricant to the connection between the brake pads and the brake calipers. New brake pads: New cars or those with newly replaced brake pads may produce similar noises when braking. This is because new brake pads and discs require a break-in period. The noise during braking is completely normal during this process.
I've been driving a Mercedes-Benz GLC260 for a while, and the annoying noise when slowly releasing the brakes is quite bothersome. The common cause is friction between the brake pads and discs. New brake pads have a hard surface, so squeaking during the break-in period is normal. If the car has been parked for a long time, rust or dust on the brake discs can cause a clicking sound when releasing the brakes. It's also necessary to check if the calipers are clogged with dust or lack lubrication, as sticky pistons in the calipers can lead to noise. Worn suspension components, such as bushings, might indirectly contribute by causing slight body movement and noise when releasing the brakes. I recommend visiting a 4S shop for a thorough inspection first. Technicians can use diagnostic tools to check the brake system clearance and suspension condition. Develop good habits, like regularly cleaning brake components to prevent water stains or sand buildup. Safety comes first—don't ignore this minor issue, as it can sometimes signal bigger problems, like excessive brake pad wear leading to brake failure.
Brake squeaking is a common issue when slowly releasing the brakes. The Mercedes-Benz GLC260 has a unique design with harder material on the contact surfaces of the brake pads and discs. Additionally, moisture and rust may form on the disc surface when starting with a cold engine, leading to louder squeaking during friction. Dust and sand particles trapped in the gaps can also cause resonance due to pressure changes when releasing the brakes, contributing to the noise. As a mechanic, I've seen many similar cases—the key is to check whether the caliper pistons and guide rails are functioning smoothly, as slow retraction can increase noise. Worn or loose suspension bushings may subject brake components to external forces, indirectly causing squeaking. If you encounter this issue, don't panic. First, try cleaning the brake dust yourself. If that doesn’t work, visit a professional shop for inspection. Since the braking system is critical for safety, regular maintenance can prevent 90% of squeaking issues, including checking disc and pad flatness and caliper lubrication every 10,000 kilometers. Developing good habits ensures both safety and peace of mind.
