windshield wipers

[drew9000cse]

so i purchased new windshield wipers, the best ones i found Rain X at 8 dollars a piece, and i also put Rain X on my windshield. but now that i have these new wipers, and after they've been going for a good minute or two, they start shaking on their way down, they start bouncing. i notice that happens when a windshield is very dry, or at least it CAN happen. because when i have the back wiper on, i sometimes forget about it, and after the rain clears, it starts moving down the window very very slow(which is fine). but i just wanna know why it bounces after a while.

[vnv727]

friction, wipers are designed to push water away while it acts as a lubricant to the blade....take the water away and the blade will bounce....

[drew9000cse]

but it still happens when the rain is coming down.

[Jim Mesthene]

That's why I don't use Rain-X within the wiper sweep on my cars. I apply it outside the wiper sweep and on the side windows.

[vnv727]

yeah i kinda figured i misunderstood ya.....the rainx thing might be it as suggested above^

[djtaylor]

Judder is usually because the wiper arm is twisted such that the blade is being pushed and not dragged across the screen.

I've never had a problem with or without Rain X applied, other than having reduced visibility and actually needing to use wipers when I don't have it.

Turn the ignition off at the point the blade is juddering and look at it to see if it's being pulled or pushed. Adjust the arm to suit.

David.