Check vacuum assisted brake system integrity

• With vacuum depleted from the system and with moderate steady force applied, the brake pedal does not travel towards the floor when the engine is started;

• If the vehicle is fitted with a low vacuum indicator, the indicator does not activate at a vacuum level of 25 kPa or more;

• With the engine stopped, one application of the service brake with a moderate pedal force results in the low vacuum indicator coming on;

• If a trailer is connected to the motor vehicle, the trailer vacuum brakes cannot be applied from the normal driving position;

• A brake pedal that is held depressed while the engine is running, tends to rise when the engine is stopped;

• Vehicle is not fitted with at least one vacuum storage reservoir or tank;

• reservoir or tank for vacuum is not protected by a check valve;

• Vacuum is not available as soon as the engine starts, or build up time to reach the low vacuum mark (to deactivate the warning device) is longer than 30 seconds;

• Time taken for vacuum to reach normal working level when the vacuum reserve is fully depleted is longer than 60 seconds;

• The vacuum warning device (if fitted) does not deactivate when the low mark is reached;

• The loss of vacuum from its maximum indicated level exceeds 125mm Hg in 10 minutes when the engine is stopped;

• With the engine stopped and vacuum at its maximum indicated level, the vacuum gauge reading does not fall progressively with every application of the service brake;

• the engine stopped, there is insufficient level of vacuum to allow at least two assisted service brake applications.