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This chapter includes inspection checklists, charts and circuit diagrams that will help you complete the inspections you need to make, as well as help you prepare for the Ministry of Transportation air brake endorsement practical examination.
Air brake system means a system that uses air as a medium for transmitting pressure or force from the driver control to the service brake, including an air-over-hydraulic brake
Air brakes use compressed air to make the brakes work. Air brakes are a good and safe way of stopping large and heavy vehicles, but the brakes must be well maintained and used properly. Air brakes are really three different braking systems: service brake, parking brake, and emergency brake. •= The service brake system applies and releases the ...
on the assumption the tractor air brake system is functioning properly. 1.) Insufficient Brakes-Brakes need adjusting, lubricating or relining.-Tractor protection valve not in “normal” position.-Faulty relay emergency valve.-No trailer air supply - clogged emergency line.-Low air pressure in the brake system (below 80 psi).
The Seven-Step Air Brake check is designed to test the governor cut-in and cut-out pressures, air pressure leakage, warning buzzer, brake valves and air pressure rebuild rates. Brakes off means the yellow and/or red valve is pushed in (on = valve out).
placed in the correct operating environment, air disc brakes can be used successfully on today’s modern commercial vehicle. Sizing the brake to meet the specifi c load carrying requirements of the trailer can improve the vehicle’s average stopping distances.
Normal air brake system pressure range is around 690 to 828 kPa (100 to 120 psi). Drivers should know the normal pressure range of the vehicle they operate and should report any abnormal condition. Abnormal pressure readings should always be verified by a technician using an accurate gauge.
