Wiper juttering
Thread Starter
Instructor
Joined: Apr 2025
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Wiper juttering
Looking for some advice here. Have a new 992 and the wiper on the driver side jutters in heavier rain (it does not happen in light rain or cleaning the windows). It drives me nuts. I thought it may be related to ceramic coating that I recently had applied. I had the installer redo a coat on the windshield to smooth it out. I then replaced the blades with silicone PIAA blades but its still happening. Any other ideas? Thanks!
Last edited by Saintly.stead; Aug 31, 2025 at 05:07 PM.
Rennlist Member
Joined: Jun 2001
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From: North Bay Area, CA
Guessing here, but I wonder if the slickness of your coated windshield is actually the problem. The rubber blade has to "flip" when the wiper changes direction otherwise it will slide and judder across the glass. Maybe the blade can't get a "bite" on the glass so that it can flip over because it's TOO slick, especially when there's more water to lubricate the glass?
Never had a windshield coated before so have no idea if your problem is at all common. Could be something else entirely. Just a thought.
Never had a windshield coated before so have no idea if your problem is at all common. Could be something else entirely. Just a thought.
Last edited by Mike in CA; Aug 31, 2025 at 05:25 PM.
Three Wheelin'
Joined: Feb 2012
Posts: 1,306
Likes: 849
I have windshield protection film, and my wipers shudder also. I complained about to my installer, and he told me the solution was for them to apply some ceramic to the wiper blade edge. This did take care of it, but the shudder has returned. (I dont remember if I got new wipers with my last service; otherwise the coating could have worn off). Nevertheless, try applying some ceramic to the wiper edges.
Three Wheelin'
Joined: Jan 2021
Posts: 1,476
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From: behind the 8 ball
Doesn't always work, but try rain-X windshield cleaner. Seems to act like a lubricant and worked for me with the only caveat being you must stay on top of it (clean with it very week or so in rainy season). GL.
Burning Brakes
Joined: Jan 2022
Posts: 889
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From: Maryland
Def the coating. Happened to me recently. It does go away over time -- for me about 3 months of daily driving.
Adding the coating to the blades itself helps a little as someone has mentioned.
Adding the coating to the blades itself helps a little as someone has mentioned.
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From: Doylestown, PA
When you ceramic coat a windshield, the water clears so completely that youre dragging a dry blade across the windshield. Ask your installer about a blade lubricant.
If you do nothing, the wipers will eventually just wear right through the coating.
I generally discourage any windshield coatings or films if you intend to actually drive your car. These are products without real world benefits.
If you are worried about chips, carry a cheap (<$20) windshield repair kit in your 911. You can fix a small chip before it turns into a big problem.
https://rennlist.com/forums/992/1281...s-the-day.html
If you do nothing, the wipers will eventually just wear right through the coating.
I generally discourage any windshield coatings or films if you intend to actually drive your car. These are products without real world benefits.
If you are worried about chips, carry a cheap (<$20) windshield repair kit in your 911. You can fix a small chip before it turns into a big problem.
https://rennlist.com/forums/992/1281...s-the-day.html
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Thread Starter
Instructor
Joined: Apr 2025
Posts: 187
Likes: 121
Thanks for all the input. I have never ceramic coated a car before and I probably would have skipped the windshield in retrospect. Even when raining you kind of need the wipers so Im not seeing any real world benefit from coating the windshield. And like I said, the jittering drives my OCD wild. Thanks again.
Thread Starter
Instructor
Joined: Apr 2025
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Three Wheelin'
Joined: Jan 2021
Posts: 1,476
Likes: 1,469
From: behind the 8 ball
Strange. My coated windshield is like using traditional Rain-X in that at speeds of 40 and above, I dont need to use the wipers even in torrential downpours. The faster Im going the better the coating works.