The purpose of the GMC Power Steering Pressure Line Hose is to make it possible for the transfer of pressurized hydraulic fluid being generated by the power steering pump to the steering box so the wheels can be easily turned. Since this is a high pressure hose, if a breach does occur for any reason at any point in it, the hydraulic fluid that provides the power steering assistance to the driver will be lost nearly instantly.
The construction of the power steering pressure line hose is of a reinforce polymer which is of a small diameter in the inside. This allows for the pressurized hydraulic fluid to be transferred from one side of your GMC truck to the other without any significantly lose in the pressure.
The power steering pressure line hose provides the means for the input from the steering wheel to have a significant assistance to the power of turning the wheels so maneuvering in traffic is much easier for the driver. When a breach does occur in the power steering pressure line hose the fluid is lost at a rapid rate and replaced by air. Air compresses significantly and will massively reduce the effectiveness of the power steering assistance to the driver of the GMC truck.
To locate a breach in the GMC power steering pressure line hose, an inspection has to occur when the system is pressurized. This happens each time the steering wheel is turned when the engine is running. Once the breach has been located the new power steering pressure line hose can be put into place. Before the GMC truck is ready for service, the air has to be bled from the power steering system to make the system fully functional. The thickness in the walls of the GMC Power Steering Pressure Line and Power Steering Pressure Hose makes them capable of handling the extremely high pressures this system requires to operate properly.
It is the placement of the power steering pump on one side of the engine compartment and the power steering box on the other that makes it necessary for the power steering pressure line and hose to be present on the vehile. This way the pressurized fluid can be transfer from its point of origin to where it is needed to assist the driver in maneuvering the GMC vehicle.
The power steering system is a closed loop system so it can properly operate. When the power steering hose or line has a rupture in it, the fluid will leak out at an incredible rate due to the pressure the fluid is compressed too. This rupture will look similar to a fountain to any inspector who is looking for a leak when the power steering system is pressurized.
With the loss of hydraulic fluid through the rupture in the power steering pressure line or hose, air will be allowed into the system on your GMC truck. The hydraulic fluid cannot be compressed and why it is used as the medium in this system. The air that replaces it can be compressed and why the leak of the fluid so adversely affects the performance of the power steering system on your GMC truck.
Even with the smallest rupture in the GMC power steering pressure hose or line, replacement of the faulty component must occur within a small allotment of time. The longer this period of time goes on, the less assistance the operator of the truck will have in maneuvering the vehicle.