Test brakes on a dry, clean, reasonably smooth and level roadway. A true test of brake performance cannot be made if the roadway is wet, greasy, or covered with loose dirt so that all the tires do not grip the road equally. Testing is adversely affected when the roadway is crowned, which throws the weight of the vehicle toward the wheels on one side, or when the roadway is too rough, which makes the wheels bounce.

Test the brakes at different vehicle speeds with both light and heavy pedal pressure. Because of a high deceleration capability, a firmer pedal may be felt at higher deceleration rates.