Power steering was invented earlier in the century to deal with the excessive weight of modern
vehicles.

Power steering relies on a simple principle- a hydraulic pump running off a belt driven by the engine
places a small amount of fluid under pressure, which in turn assists the steering mechanism in
directing the tires as you turn the steering wheel. The system typically includes a pump, a pressure
hose assembly, a control valve, and a return line.

There are three types of power steering systems used on passenger vehicles. The first and most
popular is known as power rack-and-pinion steering. It utilizes a power unit built directly into the rack
assembly. When the wheel turns, an internal rotary valve directs the flow of power steering fluid to
the proper end of the power cylinder. The difference in pressure on either side of this cylinder
assists in moving the rack, thereby easing steering. A control valve then returns excess fluid to the
main reservoir.

The second system, used mostly on larger vehicles (SUVs and pickup trucks) is called
recirculating-ball steering. In this system, a series of steel balls act as rolling threads between the
steering shaft and the rack piston. The rack piston moves up (right turn) or down (left turn), assisted
by hydraulic pressure. As in the system above, fluid pressure is regulated by a control valve.

The third is in many of todays newer vehicles. It is Electric Power Assist. There is no belt driven
power steering pump, pressure or return lines or fluid. This system uses an electric motor, control
module, and sensors in the steering column to produce the power assist. If there is a problem in the
system, a
warning light will come on the dash or the Driver Information Center.
Clunking Noise in Steering Wheel My 2006 Chevy Malibu
when i turn the steering wheel and when i stop and hit bumps. When
i stop or hit the gas and turn...
Whine Noise in My 2008 Impala 3.5l v6. Not Power Steering
After  letting sit and idle, if you rev a little, the engine whines, and gets
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air compressor for back shocks come on but still have shaking when i reach  up to
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My Torrent has no power steering. It is very stiff. The service stability light is on. Check  
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Power Steering Fluid leak and Makes Noise 2006 Impala
It is grinding and whining. I checked the fluid and it is low / empty. Where did the fluid...
A few Related Questions
12-29-10
A 2005 Chevy Silverado Diesel power steering and breaks are out. Any suggestions on
what the problem would be. Have been told that power steering pump is out. Would this
cause break failure? And how would this be checked the power steering pump?
Comments
This system is called Hydroboost. It uses the power
steering pump to power the brake booster and steering.
Most likely the shaft in the steering pump broke causing
no pressure. Pry the pulley a little to see if it moves
outward from the pump body.
4-5-11
2009 Malibu is having whining in the steering while making any type of turn?  Can u help?
2-2-12
why do i have no power steering after replacing the power steering pump on a 1999
Oldsmobile intrigue 3800 series 2 motor.
If you replaced it for this reason, then you have another
problem, like a bad rack and pinion. If the steering was
OK before, then you just have air in the system.


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