Why is the wiper making a scraping noise?

[SanChristopher]

The reasons for the wiper making a scraping noise are: 1. The wiper blade has aged and hardened; 2. There is a foreign object between the wiper blade and the windshield; 3. The linkage mechanism is deformed or there is a problem with the motor clearance relay, etc.; 4. If the wiper moves too fast, too slow, or continuously, it is because the angle of the wiper arm is incorrect. The wiper, also known as the windscreen wiper, is a device used to remove raindrops and dust attached to the vehicle's windshield, improving the driver's visibility and increasing driving safety. The wiper is composed of a motor, reducer, four-bar linkage mechanism, wiper arm spindle, wiper blade assembly, etc.