I have a whine in my truck around 80kpm or 50 mph the strange thing is that it goes away when I touch the brake the dealership can't find out what it is can any one out there help me

The truck is a 2004 F150 reg cab 4x4 heavy payload pkg completly stock

 

Threr is alot of it going around. I had it in my 02 and dealer changed the rear axle. Do a search above and you will find alot on this.

 

My truck is in the shop for the 6th time for a whine in the rear end. Check out the TBS on the whine - New gear set was put in our truck and it is back in the shop again.

 

Sounds exactly like mine, only whined under acceleration. It was the pinion bearings. Got 'em replaced and the sound is gone.