Major Work Activity C - Services, diagnoses and repairs air systems and brake systems
Table of Contents
- Task C-13 Services, diagnoses and repairs air systems
- Task C-14 Services, diagnoses and repairs brake systems
Task C-13 Services, diagnoses and repairs air systems
Task Descriptor
Air systems provide compressed air to control and operate vehicle systems and components such as braking, fan hubs and ride height, and accessories such as seats, wipers and 5th wheel slide cylinders.
Truck and transport mechanics service, diagnose and repair air systems to ensure proper function and reduce down time.
C-13.01 - Services air systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| C-13.01.01P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| C-13.01.02P | perform sensory inspections | sensory inspections are performed to identify worn, damaged, defective and incorrect components |
| C-13.01.03P | measure air pressures | air pressures are measured to determine if they meet manufacturers’ service information and jurisdictional regulations |
| C-13.01.04P | release stored energy | stored energy is released by opening air tank drain valves, caging spring brake and fanning down brakes |
| C-13.01.05P | remove and replace consumables | consumables are removed and replaced according to manufacturers’ service information and fleet/owner maintenance schedule |
| C-13.01.06P | recycle and dispose of consumables | consumables are recycled and disposed of according to jurisdictional regulations |
| C-13.01.07P | adjust governing air pressures | governing air pressures are adjusted according to jurisdictional regulations and manufacturers’ service information |
| C-13.01.08P | record service information and inspection findings | service information and inspection findings are recorded according to manufacturers’ requirements for warranty, and for future reference and tracking |
Range of Variables
- tools and equipment include: air pressure gauges, soap and water, electronic service tools
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- components include: air lines, air dryers, governors, compressors, brake chambers (pots), air tanks, valves, low air warning systems
- stored energy includes: air pressure, spring pressure
- consumables include: air filters, desiccant
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| C-13.01.01L | demonstrate knowledge of air systems, their components and consumables, characteristics, applications and operation | identify types of air systems and their components and consumables, and describe their characteristics and applications |
| describe operating principles and design of air systems | ||
| C-13.01.02L | demonstrate knowledge of procedures to service air systems and their components | identify tools and equipment used to service air systems and their components, and describe their applications and procedures for use |
| identify hazards and describe safe work practices pertaining to air systems and their components | ||
| describe procedures to release stored energy | ||
| describe procedures to inspect air systems and their components | ||
| describe procedures to service air systems and their components | ||
| describe procedures to remove, replace, recycle and dispose of air system consumables | ||
| identify materials that can be reconditioned, reused or recycled | ||
| C-13.01.03L | demonstrate knowledge of regulatory requirements pertaining to air systems | identify and interpret standards and regulations pertaining to air systems |
| C-13.01.04L | demonstrate knowledge of regulatory requirements pertaining to recycling and disposal of air system consumables | identify and interpret standards and regulations pertaining to recycling and disposal of air system consumables |
| C-13.01.05L | demonstrate knowledge of emerging technologies and practices pertaining to air system | identify technologies that address emissions and pollution, and describe their characteristics and applications |
Range of Variables
- components include: air lines, air dryers, governors, compressors, brake chambers (pots), air tanks, valves, low air warning systems
- consumables include: air filters, desiccant
- tools and equipment include: air pressure gauges, soap and water, electronic service tools
- hazards include: spring brake, pressurized air
- stored energy includes: air pressure, spring pressure
C-13.02 - Diagnoses air systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| C-13.02.01P | identify symptoms of problems | symptoms of problems are identified by consulting with customer or operator |
| C-13.02.02P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| C-13.02.03P | release or isolate stored energy | stored energy is released or isolated according to manufacturers’ service information |
| C-13.02.04P | perform sensory inspections | sensory inspections of components are performed to confirm complaint and establish preliminary diagnosis |
| C-13.02.05P | perform diagnostic procedure | diagnostic procedure is performed by following manufacturers’ service information to determine failure |
| C-13.02.06P | perform tests | tests are performed to assess components for wear, damage and defects by using tools and equipment |
| C-13.02.07P | compare test results to manufacturers’ service information or expected values | test results are compared to manufacturers’ service information or expected values to verify diagnosis |
| C-13.02.08P | record test results and inspection findings | test results and inspection findings are recorded according to manufacturers’ requirements for warranty, and for future reference and tracking |
| C-13.02.09P | interpret diagnostic results | diagnostic results are interpreted to determine next steps |
Range of Variables
- symptoms of problems include:air leaks, slow air pressure build up, system not building pressure
- tools and equipment include: soap and water, gauges, hand tools, electronic service tools
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards, logic diagrams
- components include: brake chambers (pots), air lines, tanks, valves, air gauges, air dryers
- tests include: pressure tests, timed tests, leak down
- next steps include: repairs, component replacement or adjustment, further diagnosis
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| C-13.02.01L | demonstrate knowledge of air systems, their components, characteristics, applications and operation | identify types of air systems and their components, and describe their characteristics and applications |
| describe operating principles, design and function of air systems | ||
| interpret information pertaining to air systems found in manufacturers’ service information | ||
| C-13.02.02L | demonstrate knowledge of procedures to diagnose air systems and their components | identify tools and equipment used to diagnose air systems and their components, and describe their applications and procedures for use |
| identify hazards and describe safe work practices pertaining to air systems and their components | ||
| describe procedures to release or isolate stored energy | ||
| describe procedures to inspect air systems and their components | ||
| describe procedures to test air systems and their components | ||
| describe procedures to diagnose air systems and their components | ||
| describe common causes and symptoms of problems | ||
| identify materials that can be reconditioned, reused or recycled | ||
| C-13.02.03L | demonstrate knowledge of regulatory requirements pertaining to air systems | identify and interpret standards and regulations pertaining to air systems |
Range of Variables
- components include: brake chambers (pots), air lines, tanks, valves, air gauges, air dryers
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards, logic diagrams
- tools and equipment include: soap and water, gauges, hand tools, electronic service tools
- hazards include: pressurized air, airborne contaminants, pinch/crush points
- symptoms of problems include:air leaks, slow air pressure build up, system not building pressure
C-13.03 - Repairs air systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| C-13.03.01P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| C-13.03.02P | release or isolate stored energy | stored energy is released or isolated according to manufacturers’ service information |
| C-13.03.03P | remove and replace worn, damaged and faulty components | worn, damaged and faulty components are removed and replaced according to manufacturers’ service information |
| C-13.03.04P | rebuild components | components are rebuilt by replacing worn parts according to manufacturers’ service information |
| C-13.03.05P | repair components | components are repaired by replacing parts causing failure, according to manufacturers’ service information |
| C-13.03.06P | adjust components | components are adjusted according to manufacturers’ service information |
| C-13.03.07P | disarm and dispose of spring brake chambers | spring brake chambers are disarmed and disposed of according to manufacturers’ service information and jurisdictional regulations |
| C-13.03.08P | verify repairs | repairs are verified using methods |
| C-13.03.09P | document repairs and verifications performed | repairs and verifications performed are documented for warranty, liability, future reference and tracking |
Range of Variables
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- components (to be removed and replaced) include: air lines, relay valves, brake chambers, modulating valves, governors, compressors, air dryer filters
- components (to be rebuilt) include: air compressors, air dryers, purge valves
- components (to be repaired) include: air starters, compressors, air dryers, driver warning system, brake chambers
- components (to be adjusted) include: air governors, ride height valves (levelling valves)
- methods include: road testing, load testing, sensory observations
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| C-13.03.01L | demonstrate knowledge of air systems, their components, characteristics, applications and operation | identify types of air systems and their components, and describe their characteristics and applications |
| describe operating principles, design and function of air systems | ||
| C-13.03.02L | demonstrate knowledge of procedures to repair air systems and their components | identify tools and equipment used to repair air systems and their components, and describe their applications and procedures for use |
| identify hazards and describe safe work practices pertaining to air systems and their components | ||
| describe procedures to release or isolate stored energy | ||
| describe procedures to remove, replace, rebuild, repair and adjust air system components | ||
| identify materials that can be reconditioned, reused or recycled | ||
| C-13.03.03L | demonstrate knowledge of regulatory requirements pertaining to air systems | identify and interpret standards and regulations pertaining to air systems |
Range of Variables
- components include: air lines, relay valves, air compressors, brake chambers, modulating valves, air dryers, filters (air dryer, desiccant), purge valves, air starters, driver warning system, air governors, ride height valves (levelling valves)
- hazards include: pressurized air, airborne contaminants, pinch/crush points
Task C-14 Services, diagnoses and repairs brake systems
Task Descriptor
Brake systems slow, stop or park the vehicle in a safe and controlled manner by using air, hydraulics or cable in conjunction with electronic controls.
Truck and transport mechanics service, diagnose and repair brake systems to ensure proper function and reduce down time.
C-14.01 - Services brake systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| C-14.01.01P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| C-14.01.02P | release stored energy in components | stored energy is released in components according to manufacturers’ service information |
| C-14.01.03P | clean components | components are cleaned |
| C-14.01.04P | perform sensory inspections | sensory inspections are performed to identify leaks and worn, damaged and defective components |
| C-14.01.05P | measure components | components are measured for brake stroke, out of round, drum or rotor wear and thicknesses to determine if they meet manufacturers’ service information and jurisdictional regulations |
| C-14.01.06P | check fluid levels in brake reservoir | fluid levels in brake reservoir are checked to determine if they meet manufacturers’ service information |
| C-14.01.07P | remove and replace consumables | consumables are removed and replaced according to manufacturers’ service information |
| C-14.01.08P | recycle and dispose of consumables | consumables are recycled and disposed of according to jurisdictional regulations |
| C-14.01.09P | adjust brakes and lubricate components | brakes are adjusted and components are lubricated according to manufacturers’ service information |
| C-14.01.10P | recalibrate ABS components | ABS components are recalibrated according to manufacturers’ service information |
| C-14.01.11P | bleed hydraulic brakes | hydraulic brakes are bled according to manufacturers’ service information |
| C-14.01.12P | record service information and inspection findings | service information and inspection findings are recorded according to manufacturers’ requirements for warranty, and for future reference and tracking |
Range of Variables
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- components include: ABS components, drums, shoes, pads, rotors, cams, slack adjusters, calipers
- components (to be measured) include: slack adjusters, brake lining, rotors, drums
- consumables include: brake linings, fluids
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| C-14.01.01L | demonstrate knowledge of brake systems, their components, consumables, characteristics, applications and operation | identify types of brake systems and their components and consumables, and describe their characteristics and applications |
| describe operating principles of brake systems and their components | ||
| describe operating principles of ABS and their components, roll stability protection and traction control | ||
| identify air brake components and describe their characteristics and applications | ||
| identify hydraulic brake components and describe their characteristics and applications | ||
| identify emergency (parking) brake components, and describe their characteristics and applications | ||
| identify ABS components and describe their characteristics and applications | ||
| identify types of brake shoes, pads and linings, and describe their characteristics and applications | ||
| identify traction control and braking systems, and describe their characteristics and applications | ||
| identify warning systems and describe their characteristics and applications | ||
| identify types of power-assisted hydraulic brakes and describe their characteristics and applications | ||
| C-14.01.02L | demonstrate knowledge of procedures to service brake systems and their components | identify tools and equipment used to service brake systems and their components, and describe their applications and procedures for use |
| identify hazards and describe safe work practices pertaining to brake systems and their components | ||
| describe procedures to release stored energy | ||
| describe procedures to inspect brake systems and their components | ||
| describe procedures to clean, measure, lubricate, adjust and recalibrate brake system components | ||
| describe procedures to remove, replace, recycle and dispose of brake system consumables | ||
| identify materials that can be reconditioned, reused or recycled | ||
| C-14.01.03L | demonstrate knowledge of regulatory requirements pertaining to brake systems | identify and interpret standards and regulations pertaining to brake systems |
| C-14.01.04L | demonstrate knowledge of emerging technologies and practices pertaining to brake systems | identify technologies that address emissions and pollution, and describe their characteristics and applications |
Range of Variables
- components include: ABS components, drums, shoes, pads, rotors, cams, slack adjusters, calipers
- consumables include: brake linings, fluids
- types of brake systems include: air, hydraulic, emergency (parking) brake, air over hydraulic
- air brake components include: brake chambers, slack adjusters (automatic and manual), rotors, S-cams, pins, bushings
- hydraulic brake components include: reservoirs, cylinders, wheel cylinders, brake proportioning valves, brake lines
- emergency (parking) brake components include: drums, shoes
- ABS components include: wiring, ECMs, modulating valves and sensors
- hazards include: pressurized air, oil injection,airborne contaminants, pinch/crush points
C-14.02 - Diagnoses brake systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| C-14.02.01P | identify symptoms of problems | symptoms of problems are identified by consulting with customer or operator |
| C-14.02.02P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| C-14.02.03P | perform sensory inspections | sensory inspections are performed to confirm complaint and establish preliminary diagnosis |
| C-14.02.04P | measure components | components are measured for brake stroke, out of round, drum or rotor wear, and thicknesses |
| C-14.02.05P | perform diagnostic procedure | diagnostic procedure is performed by following manufacturers’ service information to determine failure |
| C-14.02.06P | perform tests to assess components for wear, damage or defects | tests are performed to assess components for wear, damage or defects using ABS and hydraulic diagnostic equipment |
| C-14.02.07P | interpret schematics and compare test results to manufacturers’ service information or expected values | schematics are interpreted and test results are compared to manufacturers’ service information or expected values to verify diagnosis |
| C-14.02.08P | perform failure analysis | failure analysis is performed to determine root cause of failure |
| C-14.02.09P | record test results and inspection findings | test results and inspection findings are recorded according to manufacturers’ requirements for warranty, and for future reference and tracking |
| C-14.02.10P | interpret diagnostic results | diagnostic results are interpreted to determine next steps |
Range of Variables
- symptoms of problems include:faulty brake operation,air leaks, noises, stopping distance too long, ABS lights on, extended air pressure build time
- tools and equipment include:digital voltmeter, ABS scan tool, hydraulic diagnostic equipment, electronic service tool, air pressure gauges
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- sensory inspections include: braking performance, ABS lights, oil and air leaks
- components (to be measured) include: slack adjusters, brake lining and rotors
- tests include: leak down, performance, road, electronically initiated operational and performance
- next steps include: repairs, component replacement or adjustment, further diagnosis
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| C-14.02.01L | demonstrate knowledge of brake systems, their components, characteristics, applications and operation | identify types of brake systems and their components, and describe their characteristics and applications |
| describe operating principles of brake systems and their components | ||
| interpret information pertaining to brake systems found in manufacturers’ service information | ||
| C-14.02.02L | demonstrate knowledge of procedures to diagnose brake systems and their components | identify tools and equipment used to diagnose brake systems and their components, and describe their applications and procedures for use |
| identify hazards and describe safe work practices pertaining to brake systems and their components | ||
| describe procedures to inspect brake systems and their components | ||
| describe procedures to test brake systems and their components | ||
| describe procedures to diagnose brake systems and their components | ||
| describe common causes and symptoms of problems | ||
| identify steps for failure analysis | ||
| identify materials that can be reconditioned, reused or recycled | ||
| C-14.02.03L | demonstrate knowledge of regulatory requirements pertaining to brake systems | identify and interpret standards and regulations pertaining to brake systems |
Range of Variables
- components include: ABS components, drums, shoes, pads, rotors, cams, slack adjusters, calipers
- types of brake systems include: air, hydraulic, emergency (parking) brake, air over hydraulic, electric
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- tools and equipment include:digital volt meter, ABS scan tool, hydraulic diagnostic equipment, electronic service tool, air pressure gauges
- hazards include: pressurized air, oil injection, airborne contaminants, pinch/crush points
- symptoms of problems include:faulty brake operation,air leaks, noises, stopping distance too long, ABS lights on, extended air pressure build time
C-14.03 - Repairs brake systems
| NL | NS | PE | NB | QC | ON | MB | SK | AB | BC | NT | YT | NU |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| yes | yes | NV | yes | ND | yes | yes | yes | yes | yes | NV | NV | NV |
| Reference Code | Performance Criteria | Evidence of Attainment |
|---|---|---|
| C-14.03.01P | select and use tools and equipment | tools and equipment are selected and used according to task and manufacturers’ service information |
| C-14.03.02P | remove and replace worn, damaged and faulty components | worn, damaged and faulty components are removed and replaced according to manufacturers’ service information |
| C-14.03.03P | rebuild and repair components | components are rebuilt and repaired according to manufacturers’ service information |
| C-14.03.04P | adjust components | components are adjusted according to manufacturers’ service information |
| C-14.03.05P | verify repairs | repairs are verified using methods |
| C-14.03.06P | document repairs and verifications | repairs and verifications are documented for warranty, liability, future reference and tracking |
Range of Variables
- manufacturers’ service information include: maintenance schedule, specifications, recommendations, procedures, standards
- components (to be removed and replaced) include: slack adjusters, brake chambers, cables, wheel cylinders, cylinders
- components (to be rebuilt and repaired) include: cylinders, calipers, air lines, hydraulic lines, ABS components
- components (to be adjusted) include: brakes, ABS sensors, parking brakes
- methods include: road testing, load testing, sensory observations
| Reference Code | Learning Outcomes | Learning Objectives |
|---|---|---|
| C-14.03.01L | demonstrate knowledge of brake systems, their components, characteristics, applications and operation | identify types of brake systems and their components, and describe their characteristics and applications |
| describe operating principles of brake systems and their components | ||
| C-14.03.02L | demonstrate knowledge of procedures to repair brake systems and their components | identify tools and equipment used to repair brake systems and their components, and describe their applications and procedures for use |
| describe procedures to remove, replace, rebuild, adjust and repair brake system components | ||
| identify hazards and describe safe work practices pertaining to brake systems and their components | ||
| describe methods used to verify repairs | ||
| identify materials that can be reconditioned, reused or recycled | ||
| C-14.03.03L | demonstrate knowledge of regulatory requirements pertaining to brake systems | identify and interpret standards and regulations pertaining to brake systems |
| identify jurisdictional requirements for road testing and road worthiness | ||
| C-14.03.04L | demonstrate knowledge of emerging technologies and practices pertaining to brake systems | identify technologies that address emissions and pollution, and describe their characteristics and applications |
Range of Variables
- components include: ABS components, drums, shoes, pads, rotors, cams, slack adjusters, calipers
- types of brake systems include: air, hydraulic, emergency (parking) brake, air over hydraulic
- hazards include: pressurized air, spring pressure, oil injection, airborne contaminants, pinch/crush points
- methods include: road testing, load testing, sensory observations