Why is your f150 making noise when you break?

Answer 1

The real question is what kind of noise is it making when you brake.

A pulsing type of noise could possibly just be the anti lock brakes working which would be more noticalbe in slippery conditions.

A high pitched squealing type noise is probably the brake pads indicating the pads are in need of replacement, unless you just replaced them then it might be the type of pads you put on and the noise should go away after a couple days of driving.

A grinding noise could mean your brake pads are to worn and grinding into your rotors causing a more expensive repair and if not taken care of soon enough your vehicle could become inoperable at any time while your trying to go somewhere.