2007 Nissan Versa SL 15k miles, Brake vibration

[RicoOnTheRocks]

I'm posting this here as I suspect it will get more play than on just the Versa page alone. I've copied some of my posts from over there, so if this is slightly disjointed, you will understand.

Odd this comes up around 15,000 miles. I just had my 15,000 servicing on Monday and have been noticing a vibration in the brake pedal, only when at a full stop, that wasn't there before. The vibration goes away if I put the car into park or reverse. I haven't noticed any performance problems with the brakes otherwise (grinding, shudder when slowing etc.). I found another thread on here that was pretty much the same problem and they discovered a cracked motor mount @ 15,000. I'll be contacting the dealer here soon. Is it reasonable to share that thread with them or do they tend to get irritated by non-professionals trying to self-diagnose the problem? I'm not much of a car/mechanical/fix-it person, so attending to these things always wigs me out a bit.

zerothread/295128

-----------------------------------------------------------------------------------------Alright, in an attempt to figure out what's going on before going to the dealer, tonight I did a little experimenting. I had my wife drive the Versa and she also noticed a difference in the brake pedal vibration. When we got home, I had her remain as the driver while I got out to take a peak under the hood. I opened the hood and illuminated the engine compartment with my flashlight, I then had her shift from drive to park. I noticed that when in park, there was generally less vibration in the engine compartment. When she put it in drive, however, the vibration increased, but not to the point where I could detect anything rattling around excessively.I noticed something else though that kind of weirded me out. When she shifted from park to drive, the entire engine block would move about a quarter of on inch toward the dash (as opposed to toward the grill). It would then shift back a quarter on an inch to its starting position when shifted into park. Is this normal when a vehicle is shifted from park to drive? Maybe it's nothing and I AM a bit car stupid, but that seemed strange to me.Another question, when I got the 15,000 servicing, I basically watched the tech do everything though a big glass window they have between the waiting area and the maintenance bays. Anyway, I noticed that when he changed out the air filter, it looked like he was having a tough time getting the plastic filter cover back on. Is it possible that he used excessive force to push the thing on and that in turn tweaked a mount somewhere? I'm just speculating at this point, but I recall cringing a bit when I noticed that.

I'm taking the Versa into the dealership regardless and wouldn't be likely to mention that, but being a bit neurotic and worried about this sort of stuff, being armed with information would help.Thoughts, feelings, concerns?