I rarely use my wipers since I don't drive the truck in the rain very often but after I wash the truck, I take off for a quick drying drive and have noticed that the wiper arms move much easier on a deceleration as compared to an acceleration. Maybe this is normal on a vacuum running setup.

Craig

My '50 Chevy 3100 5 window, '62-235cu, 3:55 rear
My truck ....... Respect The Rust
If I'm not working on my truck, '65 m00stang or VW camper, I'm fishing with the wife or smoking Salmon.