Podcast
Questions and Answers
You should know that your brakes are fading when?
You should know that your brakes are fading when?
You have to push harder on the brake pedal to control your downhill speed.
If the spring brakes are on, you should push the brake pedal.
If the spring brakes are on, you should push the brake pedal.
False (B)
Repeatedly pressing and releasing the brake pedal may result in?
Repeatedly pressing and releasing the brake pedal may result in?
Loss of air pressure.
The driver must be able to see a low pressure warning which comes on before pressure in the service air tank falls below?
The driver must be able to see a low pressure warning which comes on before pressure in the service air tank falls below?
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to?
If your truck or bus has dual parking control valves, you can use pressure from a separate tank to?
The brake pedal in an air brake system controls?
The brake pedal in an air brake system controls?
To check the free play of manual slack adjusters of S-Cam brakes, you should?
To check the free play of manual slack adjusters of S-Cam brakes, you should?
Parking or emergency brakes of trucks and buses can be legally held on by _____ pressure.
Parking or emergency brakes of trucks and buses can be legally held on by _____ pressure.
Emergency stab braking is when you?
Emergency stab braking is when you?
The most common type of foundation brake found on heavy vehicles is the?
The most common type of foundation brake found on heavy vehicles is the?
If your truck has a dual air system and one of the systems is low on pressure,?
If your truck has a dual air system and one of the systems is low on pressure,?
The most important thing to do when a low pressure warning light comes on is to?
The most important thing to do when a low pressure warning light comes on is to?
With air brake equipped vehicles, the parking brakes should be used anytime the vehicle is parked.
With air brake equipped vehicles, the parking brakes should be used anytime the vehicle is parked.
The air compressor governor controls?
The air compressor governor controls?
The stop light switch?
The stop light switch?
For air brake systems in good condition, the air compressor should start pumping at about _____ psi.
For air brake systems in good condition, the air compressor should start pumping at about _____ psi.
The air loss rate for a straight truck or bus with the engine off and the parking brakes off and the service brakes on should not be more than _____ psi in one minute.
The air loss rate for a straight truck or bus with the engine off and the parking brakes off and the service brakes on should not be more than _____ psi in one minute.
The braking power of the spring brakes depends on?
The braking power of the spring brakes depends on?
How should you check spring brakes application when air pressure drops below a certain level?
How should you check spring brakes application when air pressure drops below a certain level?
If you are driving down a steep grade and have reached a safe speed of 40 mph, you would apply the service brakes until your speed drops to _____ mph.
If you are driving down a steep grade and have reached a safe speed of 40 mph, you would apply the service brakes until your speed drops to _____ mph.
The air brake lag distance at 55 mph on dry pavement adds about _____ feet to your stopping distance.
The air brake lag distance at 55 mph on dry pavement adds about _____ feet to your stopping distance.
How should you check that your service brakes are working properly?
How should you check that your service brakes are working properly?
Emergency controlled braking is when you?
Emergency controlled braking is when you?
Which of these is not a proper time to apply the parking brake?
Which of these is not a proper time to apply the parking brake?
All air brakes equipped vehicles have a supply pressure gauge.
All air brakes equipped vehicles have a supply pressure gauge.
If air pressure does NOT build up to normal within the correct amount of time?
If air pressure does NOT build up to normal within the correct amount of time?
Excessive use of the service brakes results in over heating which can lead to?
Excessive use of the service brakes results in over heating which can lead to?
The proper method of braking when going down long and or steep grades, after selecting the proper gear is to brake until your speed is about _____ mph below your 'safe' speed then release your brakes.
The proper method of braking when going down long and or steep grades, after selecting the proper gear is to brake until your speed is about _____ mph below your 'safe' speed then release your brakes.
Under normal conditions in order to engage the parking brake the driver must first _____ the air out.
Under normal conditions in order to engage the parking brake the driver must first _____ the air out.
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Study Notes
Brake System and Functionality
- Brake fading occurs when more pressure is needed on the pedal to control downhill speed.
- Never push the brake pedal if the spring brakes are engaged.
- Repeatedly pressing the brake pedal can result in a loss of air pressure.
- A low pressure warning light activates before service air tank pressure drops below 60 PSI.
Dual Air and Parking Control
- Dual parking control valves allow the use of pressure from a separate tank to release emergency/spring parking brakes for short movements.
- Parking brakes on trucks and buses are legally held by spring pressure.
- Always use parking brakes when parked, especially in air brake-equipped vehicles.
Brake Testing and Maintenance
- To check manual slack adjusters of S-Cam brakes, park on level ground, chock wheels, release parking brakes, and pull on adjusters.
- For air brake systems, the compressor should begin pumping at around 100 PSI.
- Ensure service brakes are functioning by moving slowly at 5 mph, releasing parking brake, and applying brakes firmly.
Stopping Distance and Braking Techniques
- Emergency stab braking requires braking hard, releasing during wheel lock, and reapplying when wheels roll again.
- For controlled braking, apply brakes hard without locking them up.
- Air brake lag distance adds approximately 32 feet to stopping distance at 55 mph on dry pavement.
Performance and Air Loss
- Air loss rate should not exceed 3 PSI in one minute for a straight truck or bus with the engine off and parking brakes off.
- Insufficient air pressure can result in brakes malfunctioning, requiring the driver to stop safely.
- Excessive use of service brakes can cause overheating leading to brake drum expansion.
Safe Operation Practices
- During steep descents, apply service brakes to reduce speed to 35 mph from 40 mph, then release.
- The air compressor governor manages when air is pumped into air tanks.
- Do not apply parking brake if brakes are overheated after descending steep grades.
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