Foundation brakes are used at each wheel in an air brake system. What is this most common type of foundation brake that when you release the brake, this rotates back and spring pulls the brake shoes away from the drum, letting the wheels roll freely again.
S-cam drum brake is the most common type of foundation brake. When you release the brake pedal, the S-cam rotates back and a spring pulls the brake shoes away from the drum, letting the wheels roll freely again.
It is normal that the safety valve releases air.
If you notice that the safety valve releases air, it means that there is something wrong. Call a mechanic to have it fixed right away.
Which statement below is true about the one-way check valve.
The one-way check valve keeps the air in the air tanks if the compressor begins to leak. It allows the air to flow in one direction only and all air tanks on air-braked vehicles must have this check valve.
What will happen if you push the brake pedal down while the spring brakes are on.
If you push the brake pedal down while the spring brakes are on, the brakes could be damaged by the combined forces of the spring and the air pressure. It is much better not to do so.
What do air brakes use to make the brakes to function?
All of the choices are wrong. Air brakes use compressed air to make the brakes work.
You are driving at night on an unlit road when suddenly a herd of deer crossed your way. What can you do to avoid hitting the herd and avoid a possible crash?
When you are in a situation where you need to stop quickly to avoid a crash, use controlled or stab braking. In this method, you brake in a way that will keep your vehicle in a straight line. Don't steer quickly while driving because your vehicle may rollover.
This device drops a mechanical arm into your view when the pressure in the system drops between 55 and 75 psi.
A wigwag is a type of low pressure warning device. This device drops a mechanical arm into your view when the pressure in the system drops between 55 and 75 psi.
You should not use the ______ when testing the spring brakes.
When testing the spring brakes, you need to release the parking brake so that the knob can pop out when the air pressure drops.
Which statement below is true about the brake pedal?
The brake pedal can also be called as foot valve or treadle valve. The harder the pedal is pressed, the more air pressure it will release.
What are the reasons of failed brakes?
Please select 2 correct answers
Improper brake adjustment, excessive heat, and not taking advantage of the engine braking effect are the factors that cause the brakes to malfunction.
What are the three types of foundation brakes?
The three types of foundation brakes are disc brakes, S-cam brakes, wedge brakes. The most common type is the S-cam brakes.
Air braking takes less time than hydraulic braking.
Air braking takes MORE TIME than hydraulic braking because the air in air lines takes longer to get through the brake system than fluid does.
What will happen if the low warning signal doesn't work?
If the warning signal doesn't work, you could lose air pressure and you would not know it. This could cause sudden emergency braking in a single-circuit air system.
You should drain the manual drain valve _______.
It is advisable to drain the manual drain valve every day after driving.
During cold weather, this helps to reduce the risk of ice in air brake valves and other parts.
Alcohol evaporator helps to reduce the risk of ice in air brake valves and other parts during cold weather.
They are made to slow/stop runaway vehicles in steep downgrades without injuring drivers and passengers.
Escape ramps are made to slow/stop runaway vehicles in steep downgrades without injuring drivers and passengers. Escape ramps use a long bed of loose soft material to slow runaway vehicles. Use them if you lose your brakes.
Why does spring brake must be held on by mechanical force?
Spring brake must be held on by a mechanical force. This is safeguard so that if the air pressure is too low or all the air leaks out of the system, there will still be a way to stop the vehicle.
Vehicles with _______ are required to have an air pressure gauge.
Vehicles with air brakes are required to have an air pressure gauge.
These gauges will help you know how much pressure is in your vehicle's air tanks.
Supply pressure gauges tell you how much pressure is in your air tanks
Pressing and releasing the brake pedal unnecessarily can:
Pressing and releasing the brake pedal unnecessarily can Let the air out quickly than the compressor can replace it. If the pressure gets too low, the brakes won't work.
Which statement below is true about brake shoes?
Brake shoes are located inside each brake drum.
To perform this test, the vehicle's pressure should be built up to maximum pressure (cut-on).
To perform applied leakage test, the vehicle's pressure should be built up to maximum pressure (cut-on).
Manual adjustment of the automatic slack adjuster is advisable.
No. Always remember that manual adjustment of the automatic slack adjuster is dangerous because it may give the driver a false sense of security regarding the effectiveness of the braking system.
Some vehicles such as buses have separate _______ to release _______.
Some vehicles such as buses have separate air tanks to release spring brake.
Air pressure should build from 85 to 100 psi within 45 seconds in _________.
For dual air systems, air pressure should build from 85 to 100 psi within 45 seconds.
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