LOST POWER STEREING AND BRAKES AT THE SAME TIME ON 2003 GMC YUKON FLUIDS ARE FINE AND THE PROBLEM IS CONSTANT
LOST POWER STEREING AND BRAKES AT THE SAME TIME ON 2003 GMC YUKON on 2003 GMC Yukon XL 2500
they use a unit called a hydrovac. instead of vaccum brakes, they use power steering pressure to operate brake assist and steering. check the fluid. if it is ok, then either the pump or hydrovac unit is bad. the pump is a more common failure.