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When is it acceptable to not use parking brakes if you have to leave your vehicle unattended?
Correct answer(s):
- You should never leave your vehicle without using parking brakes or chocking the wheels
When should parking brakes NOT be used?
Correct answer(s):
- When the brakes are wet in freezing temperatures
- When the brakes are very hot
- When checking that the spring brakes can come on automatically
Which device is designed to protect the air tank and system from too much pressure?
Correct answer(s):
- Safety valve
What should you do before driving a vehicle with a dual air system?
Correct answer(s):
- Make sure that both primary and secondary system build up to 100 psi
If you press and release the brake pedal rapidly, what will happen?
Correct answer(s):
- You can let the air out faster than the compressor can replace it
What is another term for a brake pedal?
Correct answer(s):
- Treadle valve
What is the name of the device that controls when the air compressor will pump air into the air storage tanks?
Correct answer(s):
- Governor
Which device helps reduce the risk of ice in the air brake systems during cold weather?
Correct answer(s):
- Alcohol evaporator
Which of the following steps should you use to check the slack adjusters on S Cam brakes?
Correct answer(s):
- Use gloves and pull hard on each slack adjuster
What is the typical air pressure of a fully charged air brake system?
Correct answer(s):
- 125 psi
What is the proper way to test the air leakage rate?
Correct answer(s):
- Turn off the engine and release the parking brake
What is stab braking?
Correct answer(s):
- Applying your brakes until the wheels lock up, releasing, and then reapplying when the wheels start rolling
Why do air brakes take longer to stop than hydraulic brakes?
Correct answer(s):
- It takes longer for the air to flow through the lines
What will happen if your air compressor stops?
Correct answer(s):
- You'll still have air pressure left in the air tanks to stop
How should you check your air compressor governor “cut in” and “cut out” pressures?
Correct answer(s):
- Run the engine at a fast idle
- Step on and off the brake to reduce tank pressure
- Monitor the air pressure gauge
How fast should the air pressure build in a dual air system?
Correct answer(s):
- From 85 to 100 psi in 45 seconds
What are the typical air compressor governor cut-in and cut-out pressures?
Correct answer(s):
- Cut-in: 100 psi; Cut-out: 125 psi
What device will keep air in the tanks if the air compressor develops a leak?
Correct answer(s):
- The one way check valve
Which of the following devices indicates how much pressure you have in your air tanks?
Correct answer(s):
- Supply pressure gauge
Which of the following statements regarding spring brakes is true?
Correct answer(s):
- Spring brakes are held by mechanical force