Gmc 2007 Sierra User Manual download pdf (Page 367)

100

101

Steering

Power Steering

If you lose power steering assist because the

engine stops or the system is not functioning,

you can steer but it will take much more effort.

Steering Tips

It is important to take curves at a reasonable speed.

A lot of the “driver lost control” accidents mentioned

on the news happen on curves. Here is why:

Experienced driver or beginner, each of us is

subject to the same laws of physics when driving on

curves. The traction of the tires against the road

surface makes it possible for the vehicle to change

its path when you turn the front wheels. If there is

no traction, inertia will keep the vehicle going in the

same direction. If you have ever tried to steer a

vehicle on wet ice, you will understand this.

The traction you can get in a curve depends on

the condition of your tires and the road surface,

the angle at which the curve is banked, and

your speed. While you are in a curve, speed is

the one factor you can control.

Suppose you are steering through a sharp curve.

Then you suddenly accelerate. Both control

systems — steering and acceleration — have to

do their work where the tires meet the road.

Adding the sudden acceleration can demand too

much of those places. You can lose control.

See Traction Assist System (TAS) on page 363.

What should you do if this ever happens? Ease up

on the accelerator pedal, steer the vehicle the

way you want it to go, and slow down.

Speed limit signs near curves warn that you

should adjust your speed. Of course, the posted

speeds are based on good weather and road

conditions. Under less favorable conditions you will

want to go slower.

If you need to reduce your speed as you

approach a curve, do it before you enter the

curve, while your front wheels are straight ahead.

Try to adjust your speed so you can “drive” through

the curve. Maintain a reasonable, steady speed.

Wait to accelerate until you are out of the curve,

and then accelerate gently into the straightaway.

Adding non-GM accessories can affect your

vehicle’s performance. See Accessories and

Modiﬁcations on page 468.

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