NOTE1: Decelerometer standards should be read in conjunction with the equipment manufacturer's specification.

On some vehicles with light axle loads, or when testing in wet weather, it might be difficult to obtain a brake test result because of wheel lockup. In these cases the pedal pressure should be reduced to a point where only the minimum specified deceleration rates are achieved.

Set up a suitable decelerometer in the vehicle cabin. Drive the vehicle to a speed of at least 30 km/h. If the vehicle has a manual transmission, put the transmission into neutral, (automatic transmission vehicles may remain in gear). With hands on the steering wheel, bring the vehicle to a halt as rapidly as possible in a safe manner with one sustained and smooth application of the service brakes.

Reasons for rejection

• The application of the brakes causes the vehicle to swerve from a straight line path;

• The service braking system decelerates the vehicle at less than the performance requirement.