166. The following are major defects in a pneumatic braking system:(1) a flexible line that bulges when under pressure or a thermoplastic line that is worn to the second layer of color or the second braid;
(2) an air line fitting that does not comply with the manufacturer’s standards for its application;
(3) the driving belt of the air compressor that has a cut that will very likely lead to a breakdown;
(4) an air compressor that is not securely mounted or whose pulley is cracked or broken or a compressor that is unable to reach or to maintain a minimum pressure of 620 kPa while the engine is idling, the service brake is fully applied and the parking brake is released;
(5) an air pressure loss, after the service brake has been fully applied for a minute while the air pressure is at the maximum, the engine is off and the parking brake is released, that exceeds(a) 40 kPa for a single-unit road vehicle;
(b) 48 kPa for 2 vehicles;
(c) 62 for 3 vehicles;
(6) the safety valve of the tractor truck that is absent or does not maintain a minimum of 138 kPa while it is towing a trailer or semi-trailer equipped with pneumatic brakes;
(7) the angle between the centre of the roll and the lowest position of the cam that is greater than 120º degrees where the brake linings touch the drum;
(8) different sizes of brake chambers or brake levers mounted on an active steering axle;
(9) the travel of the control rod of 20% or more of the brake chambers of a road vehicle that exceeds by 6.4 mm or more the maximum setting value provided by the manufacturer; and
(10) none of the low pressure visual and warning lights or buzzers indicating a pressure lower than 380 kPa is working.