What is the problem when there are abnormal noises during car starting and braking?
2 Answers
Reasons for abnormal noises during car starting and braking: 1. Normal phenomenon for automatic transmission vehicles. The slower and lighter you release, the more obvious this noise will be. This is because as long as the gear lever of an automatic transmission car is not in the parking gear or neutral gear, the engine will have power output, and there will also be power output at idle speed. If you want to stop, you need to step on the brake pedal; 2. It may also be a problem with the brake pads. Both the brake disc and brake pads are high-wear items. Every time you brake, the two parts will rub against each other. Over time, wear will naturally occur. When the wear is excessive, abnormal noises will naturally occur, so regular inspection and replacement are necessary.
I've seen this issue several times. Abnormal noises during car starting and braking usually require checking the brake system first. The most common causes are uneven wear of brake pads or foreign objects stuck in them, leading to friction during startup and squeaking sounds when braking. If there's looseness in the steering system, such as the front suspension's swing arm or worn ball joints, it can also produce noises during acceleration or sudden stops. It's recommended to first check the thickness of the brake pads; if they're below 3mm, they should be replaced. Also, inspect the brake discs for grooves, as cleaning off dust or rust can alleviate the issue. For the suspension, have a technician use a lift to check if the connecting rods and shock absorber mounting points are secure, as failure of small components can worsen abnormal noises when driving over bumps. Ignoring these issues can threaten driving safety, so it's best to visit a professional shop as soon as possible to prevent potential hazards from escalating.
