shudder upon deceleration

[Pontiac]

2014 Trophy SE with only 4500 miles on it. Coming home from a ride recently it suddenly developed a very noticeable front shudder upon deceleration. Scared me enough to pull over in a parking lot and test front brake. Nothing upon hard front braking at slow speed but ANY time I let off throttle there is a very noticeable front shudder. Almost like someone kicking the left side of front end (when sitting on bike). Plan is to trailer it to dealer for them to check out. Anybody else experience this? Thanks everyone.

[digital]

During a long trip we did, something similar happened to us and it was the rear brake jamming, since it is in combination with the front brake.

I stopped the bike as best I could, since there was no arcen on the road and I gave the rear brake a few blows, I waited half an hour for the brake disc to cool down and continue our journey, obviously due to the excess heat, the disc right brake suffered a small oval shape. When I get home, I change the entire front wheel for a spare one that I have and about two months ago the wheel that suffered that engorgement caused by the rear brake. I replaced the two front brake discs with Brembo brand ones.

[Novocastrian]

This is weird (and don't laugh)!) but I was out on my AJS Modena 125cc scooter last week and the rear brake started to bind.  It got worse and worse to the point I only just got back home.  The brake lever wouldn't compress any as well.
 Had me puzzled.  But someone suggested that my brake fluid may have absorbed water as it is long overdue for replacement and as it was a hot day the expansion of the water in the brake fluid may have been the problem.  I have yet to have a good look at it but the day after, the rear wheel was spinning again. All very weird.....

[Coconut]

In case it isn't anything to do woth the brakes, other possibilities include :

Wheel Balancing weight has fallen off.

Worn Front wheel bearing(s).

Worn Headstock Bearings or in need of adjusting.

Tyre wear, especially "scalloping".

Cheers 

[jaapvanthoff]

I agree with Coconut.Tyre wear, especially "scalloping".
i have had the same problem, and after i got a new tire, my problem was solved.

[Pontiac]

Thanks everyone. I am guessing mine is a rear brake issue as I had both tires replaced just a few months ago and I can feel zero play in front end when bike is on center stand. If it was a dirt bike I would have already had it torn down myself but I'm not comfortable working on this one with all the electronics. Trying to get to dealer later this week.

[Coconut]

Keep us posted with what the Dealer finds 

[Pontiac]

Update

Since dealer cant get me in for a few days I started diving in myself and have found the whole rear wheel has play in it. When on center stand I can grab one of the wheel spokes and it moves back and forth (sideways from left to right) at least a quarter inch. So is this a rear wheel bearing or something to do with the shaft drive? The 5 bolts that have to be removed when replacing tire all seem tight. Makes me wonder if dealer did something wrong when they did rear tire replacement a few months ago or is this unrelated? Either way it's got to be fixed.