vibration when braking downhill?

I own Kia Sorento year 2004, when I am braking downhill I always feel this heavy vibration on my front wheels, can someone explain.

I don´t have brake fluid leaks, the cv joint´s ok, the breaking pads are ok, the brake disk is ok too.

I'm going to suggest you have a slightly warped brake rotor. I realize you said the brake disk is OK, but didn't indicate if you checked it for run-out on the brake lathe or if it is simply still within it's wear specification.

Note that

Kia UK recall after faulty brake light switch

3,525 current Sorento units built between October 2009 and April 2011, 4,676 Souls units built between June 2010 and June 2011 and two Optima models built between August 2010 and April 2011 are included in the recall programme. Kia Motors (UK) is recalling 25,192 vehicles for the replacement of a possibly faulty brake light switch on a variety of cars built between 2006 and 2011. 4,246 previous model Sorento units built between May 2007 and December 2008. 3,535 previous model Carens units built between March 2008 and November 2009. 8,080 previous model Sportage units built between September 2007 and January 2010. In detail, the vehicles affected are: 1,128 Sedona models built between November 2006 and June 2007. s rear brake lights to not illuminate &ndash. or may not turn off after the brake pedal is released.
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    6b8c 1 b JPG SORENTO to 1 12 04 2003 2004