If you want to pull a trailer with air brakes, you also need to read Section 6: Combination Vehicles in this handbook.Īir brakes use compressed air to make the brakes work. If you want to drive a truck, bus, or pull a trailer with air brakes, you need to read this section. 2 20.This section tells you about air brakes. A straight truck or bus air brakes system should not leak at a rate of more than _PSI per minute with the engine off and the brakes released. What may happen if yon don't keep the unit filled with alcohol? Ice may form in the air storage tanks and cause the brakes to fail. Some air brake systems have an alcohol evaporator. If a low air pressure warning comes on for only one system, what should you do? Stop right away and safely park, continue only after the system is fixed. Your truck or bus has a dual air brake system. To check the free play of manual slack adjusters on the S-cam, you should park in: Level ground, chock the wheel, and turn off the parking brakes. Excessive use of the service brakes results in overheating, which can lead to: Expansion of the brake drums *16. After just coming down a step grade) *15. Which of these is NOT a proper time to apply the parking brakes? If the brakes are very hot( e.g. If your truck or bus has dual parking control valves, you can use pressure from a separate tank to: Release the spring emergency/parking brakes to move a short distance.
Before driving a truck or bus with dual air brake system, the pressure in each system should be at least _PSI. If air pressure does NOT build up to normal within the correct amount of time, then: Your air pressure may drop too low during driving, requiring an emergency stop.
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