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Excessive pressure (>3.5 N/cm): Deforms rubber, increases motor load, overheats, and may scratch glass (especially dry). Also accelerates rubber wear. Insufficient pressure (<1.0 N/cm): Leaves water streaks, li...

Juddering at high speed results from an imbalance between aerodynamic lift and arm pressure: Insufficient arm pressure: Aged springs reduce downward force, allowing wind to lift the blade. Test with a spring gauge – re...

Noise usually comes from the installation angle or glass condition, not defective blades: Wiper arm twist angle misaligned: The blade must sit perpendicular to the glass. If the arm spring or holder is bent, the rubber...

Wiper connectors fall into four main types: J-hook, Side Pin, Bayonet, and Push Button. To determine yours: Inspect the original wiper: Lift the arm and look at the attachment point. J-hook is a U-shaped metal clasp; S...