help my kia sportage 95 goes out on descent

Hello friends, someone can help me I have a kia sportage model 95 and when I boy in a descent or leans it does not do it horizontally only in descent or when there is a brake drop and it goes out and smells like gasoline

Hello, I tell you once I spend a Chevrolet Blazer who had the broken gas pump glass and the air came in a descent when I passed that I thought it was the diesel gasoline filter but if it is only when braking it may be something of the brake servo, the strange thing is that it is only when braking proba of doing so squeezing the
clut Diesel is not the servo because the empty generates it with a depressor
but anyway the first thing it would check is the diesel filter and the fuel pump

Hello, I tell you once I spend a Chevrolet Blazer who had the broken gas pump glass and the air came in a descent when I passed that I thought it was the diesel gasoline filter but if it is only when braking it may be something of the brake servo, the strange thing is that it is only when braking proba of doing so squeezing the
clut Diesel is not the servo because the empty generates it with a depressor
but anyway the first thing it would check is the diesel filter and the fuel pump