Podcast
Questions and Answers
What is the minimum tread depth on the front tires?
What is the minimum tread depth on the front tires?
4/32
How much tread depth is needed on the back tires?
How much tread depth is needed on the back tires?
2/32
At what amount of DEF fluid should you fill up?
At what amount of DEF fluid should you fill up?
1/8
What should your oil pressure be at when the truck is idling?
What should your oil pressure be at when the truck is idling?
What should your oil pressure be at when the truck is operating?
What should your oil pressure be at when the truck is operating?
How long should it take the truck to build 50-90 psi?
How long should it take the truck to build 50-90 psi?
How much psi does the governor cut off engage?
How much psi does the governor cut off engage?
How often should trucks check their cargo?
How often should trucks check their cargo?
How should your cones be set out on one-way traffic?
How should your cones be set out on one-way traffic?
How far should your cones be apart on obstructed view?
How far should your cones be apart on obstructed view?
What is perception distance?
What is perception distance?
What is reaction distance?
What is reaction distance?
Why do empty trucks take longer to stop than a loaded truck?
Why do empty trucks take longer to stop than a loaded truck?
Examples of road hazards?
Examples of road hazards?
How often should you inspect your tires?
How often should you inspect your tires?
How many straps should cargo have on it?
How many straps should cargo have on it?
How much play does the slack adjuster need before it needs an adjustment?
How much play does the slack adjuster need before it needs an adjustment?
In a dual air system, how long does it take to build 85-100 psi?
In a dual air system, how long does it take to build 85-100 psi?
How much play can a belt have to be operational?
How much play can a belt have to be operational?
What belts should you check for snugness?
What belts should you check for snugness?
What does the emergency kit consist of?
What does the emergency kit consist of?
How much play can a steering wheel have?
How much play can a steering wheel have?
How do you test hydraulic brakes?
How do you test hydraulic brakes?
Brake push rod should not move more than how much when pushed or pulled on by hand?
Brake push rod should not move more than how much when pushed or pulled on by hand?
How do you test a parking brake?
How do you test a parking brake?
How many leaf springs have to be missing for the truck to be put out of service?
How many leaf springs have to be missing for the truck to be put out of service?
What should be some things you check when you approach your vehicle for a pre-trip inspection?
What should be some things you check when you approach your vehicle for a pre-trip inspection?
What should you do if oil pressure is low, dropping, or fluctuating?
What should you do if oil pressure is low, dropping, or fluctuating?
How do you test a service brake?
How do you test a service brake?
How far ahead should you be looking?
How far ahead should you be looking?
When you signal, what should you do?
When you signal, what should you do?
What is the equation for total stopping distance?
What is the equation for total stopping distance?
The average driver has a reaction time of what?
The average driver has a reaction time of what?
At 55 mph, your vehicle will travel a minimum of what?
At 55 mph, your vehicle will travel a minimum of what?
Hydroplaning can happen at speeds as low as?
Hydroplaning can happen at speeds as low as?
When should you slow to a safe speed when coming up on a curve?
When should you slow to a safe speed when coming up on a curve?
What can change depending on if the vehicle is loaded?
What can change depending on if the vehicle is loaded?
What do you check when you check your tires?
What do you check when you check your tires?
What is controlled braking?
What is controlled braking?
What can cause skidding?
What can cause skidding?
What are the two basic reasons for covering cargo?
What are the two basic reasons for covering cargo?
Foundation brakes are used at each wheel; the most common type is what?
Foundation brakes are used at each wheel; the most common type is what?
At what pressure will the warning signal come on?
At what pressure will the warning signal come on?
When will the spring brakes fully come on?
When will the spring brakes fully come on?
What is the equation for total stopping distance at 45 mph?
What is the equation for total stopping distance at 45 mph?
What is total stopping distance going 45 mph?
What is total stopping distance going 45 mph?
Build air pressure until governor cut out, which is?
Build air pressure until governor cut out, which is?
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Study Notes
Tire Maintenance
- Minimum tread depth for front tires is 4/32 inches.
- Minimum tread depth for back tires is 2/32 inches.
- Inspect tires every 2 hours or 100 miles for damage and air pressure.
Vehicle Fluids
- Fill DEF fluid when it reaches 1/8 of a tank.
- Oil pressure should be between 5-20 psi when idling and 35-75 psi during operation.
Air Pressure and Braking System
- Truck should build 50-90 psi within 3 minutes.
- Governor cutout engaged between 120-140 psi.
- Dual air system should build 85-100 psi in 45 seconds.
Cargo and Load Security
- Inspect cargo every 50 miles, then every 150 miles or 3 hours.
- At least 2 straps required for cargo, plus 1 strap for every 10 feet of cargo.
Cones and Traffic Control
- On one-way traffic, cones should be set 10', 100', and 200' towards oncoming traffic.
- For obstructed view, space cones 100'-500' apart.
Distance Metrics
- Perception distance is the time taken to recognize an object.
- Reaction distance is the time before braking occurs.
- Total stopping distance combines perception distance, reaction distance, brake lag distance, and braking distance.
Brake Testing
- Test hydraulic brakes by pumping thrice and holding for 5 seconds; pedal looseness indicates an issue.
- Brake push rod should move no more than 1 inch when manipulated.
- Test parking brake by driving with it engaged; if it doesn’t hold, there’s a problem.
Safety Equipment and Quick Checks
- An emergency kit must contain spare fuses, three triangular cones, three liquid-fueled flares, and a properly charged fire extinguisher.
- At vehicle approach for pre-trip inspection, look for damage, lean to one side, and fresh fluid leaks.
Driving Considerations
- The average driver has a reaction time of 3/4-1 second.
- At 55 mph, a vehicle travels a minimum of 419 feet.
- Hydroplaning can occur at speeds as low as 30 mph.
Handling Techniques
- Controlled braking means braking hard without wheel lockup and minimizing steering movements.
- Factors causing skidding include over-braking, over-steering, over-acceleration, and excessive speed.
Cargo Regulations
- Cover cargo to protect people from spillage and to shield the load from weather elements.
Brake Types and Signals
- The most common foundation brake type is the S-cam drum brake.
- A warning signal for air pressure comes on before reaching 55 psi; spring brakes engage fully between 20-45 psi.
Total Stopping Distance
- Total stopping distance at 45 mph is 346 feet.
- Air pressure should be built until reaching the governor cutout of approximately 120-140 psi.
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