GM Service Manual Online
For 1990-2009 cars only

Test the brakes on a roadway that meets all of the following conditions:

    â€¢ Dry
    â€¢ Clean
    â€¢ Reasonably smooth
    â€¢ Level

Test the brakes at different vehicle speeds with both light and heavy brake pedal force.

Do not test the brakes on a roadway with the following conditions because the tires will not grip the road equally:

    â€¢ Wet
    â€¢ Greasy
    â€¢ Covered with loose dirt

Do not test the brakes on a crowned roadway because the weight of the vehicle will be thrown toward the wheels on one side.

Do not test the brakes on a rough roadway because the wheels will tend to bounce.