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Failure reasons
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Please select the failed component then tick the reason(s) why they failed.
If you do not understand any of the following fail reasons, please refer to the relevant section of your AIS Rules.
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Australian Design Rules can be accessed from the Federal Government site:
click here.
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| * indicates a mandatory field if selected |
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Check brake components
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Check brake adjustment
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Check air compressor/ vacuum pump
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Check air filters
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Check braking system operation
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Check vacuum assisted brake system integrity
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Check air brake system integrity (including air over hydraulic)
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Check hydraulic brake system integrity
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Service brake test with a decelerometer
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Brake testing with a skid-plate tester
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Brake testing with a roller brake tester
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Brake testing using stopping distance method
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Parking brake test for vehicles designed to ADR 35
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Advanced Braking Systems
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Check brake components
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Brake pedals do not have an anti-slip surface across the complete surface
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Brake pedals or handles are broken or missing or are outside the scope of manufacturer's original design
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Brake control mountings, pivots, cables or links are kinked, missing, loose, broken, excessively worn or binding
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Vehicle is not equipped with an effective mechanical park brake
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The locking device on a park brake handle or lever is missing or not operational
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Park brake control can be released with only one action or not designed so as to minimise the risk of inadvertent release
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Abrasions or cuts on brake hoses penetrate further than the outer protective covering
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Brake pipes, hoses and connections are not securely mounted or are cracked, broken, kinked, crimped, damaged by heat or have visible signs of leakage, swelling or are bulging
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Air reservoirs do not have an automatic or manual condensate drain valve at the lowest point of each air brake reservoir
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Brake drums or discs are not fitted, have missing pieces, or have cracks other than short heat cracks inside the drums or in the disc;
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Brake pad or shoe material does not come in full contact with brake disc or drum friction surface
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Drums or discs are worn beyond manufacturers specifications;
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A calliper, wheel cylinder or master cylinder leaks;
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Friction material of the linings or pads are contaminated with oil, grease, brake fluid or another substance that will reduce the friction coefficient of the friction material
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Insufficient thickness of brake shoe or pad linings
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Brake chambers (including chamber clamps) or camshaft support brackets are loose, bent, cracked or missing
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Air or hydraulic cylinders, hoses or chambers on sliders leak.
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Brake linings or pads are missing, broken or loose on their shoes or plates.
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Brake components are mismatched on the same axle i.e. booster size and volume.
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Brake components such as springs, anchor pins, cam rollers or bushes, pull or push rods, clevis pins, retainers or brake chamber mounting bolts are missing, loose, damaged or broken.
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Hydraulic or air-over-hydraulic brake system components, such as reservoirs, master cylinders or servo units, are loose, cracked, broken, or excessively worn or are damaged so that leaks are likely.
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Vehicles equipped with Antilock Braking Systems (ABS) where the antilock system warning light is inoperative or indicates a system fault or is missing.
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Hydraulic or air-over-hydraulic brake system master cylinder reservoir fluid levels are below the minimum level.
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There are any air/vacuum or hydraulic leaks.
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The brake controls of the towing unit do not cause the corresponding trailer brake to work when they are operated.
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Further fault details
*
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Check brake adjustment
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With any brake fully applied, a brake adjustment indicator runs out of travel or indicates that adjustment is necessary
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Brake chamber push or pull rods move more than 80% of their max stroke or travel over centre with the brakes fully applied
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With any brake fully applied any stroke indicator displays evidence of excessive stroke
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The park brake and/ or emergency brake is not capable of being fully applied without the control running out of available travel
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The brake adjusters are bent, damaged or excessively worn, or are not properly adjusted
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Further fault details
*
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Check air compressor/ vacuum pump
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The air compressor or vacuum pump has loose mounting bolts, has cracked or broken mounting brackets, braces or adaptors, or is inoperative
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Drive pulleys are cracked, broken or loose
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Drive belts are loose, cracked through to reinforcing plies, extensively frayed or missing drive sections
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The air compressor of a compressed air brake system does not build up air pressure to at least 80% of the vehicle's governor cut-out pressure within five minutes.
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Further fault details
*
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Check air filters
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Any air compressor or vacuum pump filter units are not fitted, or are loose, blocked or damaged.
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Further fault details
*
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Check braking system operation
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The brake failure indicators do not operate
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A brake air or vacuum storage system is not fitted with a visual or audible warning device to warn the driver of a loss of air or vacuum
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Any compulsory pressure, vacuum or low level warning devices or gauges do not operate
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The brake controls do not cause the corresponding brake to apply when they are operated (with the engine running if necessary)
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Further fault details
*
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Check vacuum assisted brake system integrity
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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
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With the engine stopped, one application of the service brake with a moderate pedal force results in the low vacuum indicator coming on
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If a trailer is connected to the motor vehicle, the trailer vacuum brakes cannot be applied from the normal driving position
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A brake pedal held depressed while the engine is running rises when the engine is stopped (vacuum system integrity)
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Vehicle fitted with a vacuum braking system is not fitted with at least one vacuum storage reservoir or tank
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The reservoir or tank for vacuum or air storage is not protected by a check valve with manual function
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Reservoirs are not secured or their mountings are deteriorated
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Vacuum build up time to reach the low vacuum mark (to deactivate the warning device) is longer than 30 seconds from starting engine
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Time taken for vacuum to reach normal working level when the vacuum reserve is fully depleted is longer than 60 seconds
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The vacuum warning device (if fitted) does not deactivate when the low vacuum mark is reached
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The loss of vacuum from its maximum indicated level exceeds 125mm Hg in 10 minutes when the engine is stopped
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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
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With the engine stopped, there is insufficient level of vacuum to allow at least two assisted service brake applications.
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Further fault details
*
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Check air brake system integrity (including air over hydraulic)
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Low air warning device not operating at specified or recommended levels
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Governor cut out pressure at more than specified or recommended levels
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Governor cut in pressure at less than specified levels
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With engine stopped and service brake applied air pressure drops more than specified levels
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With engine stopped and service brake released air pressure drops more than specified levels
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With engine stopped air pressure drops more than 50% in reservoir after five full brake applications
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Spring brakes apply before low pressure warning device activates
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Park brake is inoperative or is unable to be released at least once
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Air reservoir drains inoperative
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Excessive oil drains from air reservoir
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If fitted a pressure protection valve is damaged or broken
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Where required the air supply does not automatically cut off at the specified level when the trailer is disconnect or the valve is unseated (tractor-protection)
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Where ADR 35 applies, and one sub-circuit is fully drained the other sub-circuit fails to operate when service brake is applied
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Where ADR 35 applies, spring brakes apply (automatically) when one sub-circuit is fully drained
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Further fault details
*
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Check hydraulic brake system integrity
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When a constant force is applied to the brake pedal for 10 seconds: after the initial travel, the service brake pedal travels to the floor or the brake system failure indicator comes on
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When the service brakes are firmly applied, less than 20% of the pedal travel remains (unless the brake system is designed for greater travel)
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When soft pumping makes the brake pedal travel to the floor
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Further fault details
*
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Service brake test with a decelerometer
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The application of the brakes causes the vehicle to swerve from a straight line path
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Service brake system decelerates the vehicle at less than the performance requirement specified in table 2.1.
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Individual wheel locking cannot be controlled
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The emergency brake decelerates the vehicle at less than the performance requirement specified in table 2.2.
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Further fault details
*
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Brake testing with a skid-plate tester
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There is more than 30% difference in the brake force between the wheels on the same axle
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Service brake system decelerates the vehicle at less than the performance requirement specified in table 2.1.
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The emergency brake decelerates the vehicle at less than the performance requirement specified in table 2.2.
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Further fault details
*
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Brake testing with a roller brake tester
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There is more than 30% difference in the brake force between the wheels on the same axle
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The service braking system decelerates the vehicle at less than the performance requirements specified in Table 2.1
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Any parking brake assembly (which includes emergency brakes on applicable vehicles) when applied does not give a reading, or the vehicle does not lift out of the rollers
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Further fault details
*
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Brake testing using stopping distance method
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The application of the brakes causes the vehicle to swerve from a straight line path
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For vehicles built after 1930, the service braking system fails to bring the vehicle to a stop within the distance specified in Table 2.3
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The service braking system decelerates the vehicle at less than the performance requirement specified in Table 2.1
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The application of the emergency brakes causes the vehicle to swerve from a straight line path
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For vehicles built after 1930, the emergency braking system fails to bring the vehicle to a stop within the distance specified in Table 2.4
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Individual wheel locking cannot be controlled
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Further fault details
*
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Parking brake test for vehicles designed to ADR 35
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The parking brake does not provide any retardation
Click for more information...
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Further fault details
*
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Advanced Braking Systems
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An advanced braking system warning lamp is missing
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An advanced braking system warning lamp does not illuminate as required when ignition is switched to the on position
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An advanced braking system warning lamp indicates a fault with a system
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An advanced braking system component (wheel speed sensor, etc) is missing, damaged or substituted to an extent where it does not perform its intended function
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Advanced braking system wiring or connectors are corroded, damaged, not insulated or are not securely fastened
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Electrical wiring is located where it can become exposed to excessive heat or come into contact with a moving part
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An advanced braking system component or system has been modified outside of manufacturer's specifications
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A truck fitted with an advanced braking system is not fitted with a compliant ABS/EBS connector to attach an ABS/EBS equipped trailer
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Further fault details
*
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