4. Seven-Step Inspection Method
8. CDL Training: Seeing Around
14. Managing Vehicles Around You
17. Spot Hazards on RoadCDL Training
24. Vehicle for Winter Driving
25. Drive in Winter Conditions
27. Railroad-Highway Crossings
2. Air Brake Systems for Trucks
3. Air-Brake Systems & Foundation
4. Air-Brake PartsCDL Training
5. Air-Brake System Spring Brakes
6. Air Brake Systems for Trucks
7. Dual Air Brake Systems for Trucks
10. CDL Air Brake Check for Trucks
12. Emergency Stops in a Truck
1. Drive Combination Vehicles Safely
3. Handle Railroad-Highway Crossings
5. Combination Vehicle Air Brakes
7. Connect Hose Couplers (Glad Hands)
9. Antilock Brake Systems for Trucks
10. Couple & Uncouple Trucks Safely
11. Couple and Uncouple a Truck
12. Safely Uncouple Tractor-Semitrailers
2. Couple & Uncouple Trailers Safely
1. Hazardous Materials Regulations
2. Intent of Hazmat Regulations
3. Hazardous Materials Responsibility
5. Placards & Regulated Products
7. Hazardous Substances & Quantities
8. Fill Out Hazmat Shipping Paper
9. Hazmat Shipping Paper Requirements
10. Recognize Hazardous Materials
12. Load & Unload Hazardous Cargo
13. Load & Unload Hazardous Cargo
14. Loading/Unloading Hazardous Cargo
15. Bulk Packaging Markings, Loading
17. Hazmat Driving & Parking Rules
19. Keep Shipping Papers & Info
20. Respond to Hazmat Emergencies
21. Control Truck Fires & Leaks
22. Respond to CDL Training Hazards
23. Required Notification for CDL
2. School Bus Loading/Unloading
6. Emergency Exit/Evacuation CDL
7. Emergency Evacuation Procedures
1. CDL Pre-Trip Vehicle Inspection
2. Inspect Vehicle Parts for CDL
4. CDL Training: Check Oil Pedals
5. Inspect Steering & Suspension
6. CDL Training: Brake Wheel Checkup
7. Inspect Truck for CDL Training
8. Inspect Tractor & Coupling Lines
9. CDL Drivers: School Bus Inspection
1. CDL Training On-road Driving
2. On-Road Driving: Intersections
1. Learn Hours of Service Regulations
2. HOS Regulations for Truckers
3. Understanding HOS Regulations
6. 11-Hour Driving Limit for Trucks
8. Adverse Driving Conditions/16hr
1. Weight & Balance Laws for Trucks
2. Weight Transfer for Truck Drivers
3. Limitations of Axle Spacing
4. Scale Truck for CDL Training
5. Position of Trailer Tandems
6. Load Cargo for Axle Balance
7. Calculate Fuel Weight for CDL
8. Calculate Truck Driver Fuel
1. Learn Cargo Securement Fund.
2. Cargo Securement Requirements
4. Learn Containing, Immobilizing
6. Cargo Tie-Downs: Working Load
9. Secure Logs Loaded Lengthwise
12. Secure Metal Coils in Truck
13. Secure Coils Eyes Crosswise
14. Secure Coils Eyes Lengthwise
15. Secure Coils for Truck Drivers
16. Secure Paper Rolls for CDL
17. Load & Secure Paper Rolls Vert.
18. Secure Paper Rolls Vert. CDL
22. Reqs. Arrange Concrete Pipe
23. Securing Pipe Inside Diam. 1.143
24. Securing Pipe Inside Diam. 1143
25. Secure Intermodal Containers
26. Secure Autos, Light Trucks, Vans
27. Secure Heavy Vehicles, Equip.
28. Secure Flattened/Crushed Vehicles
29. Secure Roll-On/Roll-Off Hook
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Foundation brakes are used at each wheel. The most common type is the S-cam drum brake. The parts of the brake are discussed below.
Brake Drums, Shoes and Linings. Brake drums are located on each end of the vehicle's axles. The wheels are bolted to the drums. The braking mechanism is inside the drum. To stop, the brake shoes and linings are pushed against the inside of the drum. This causes friction, which slows the vehicle (and creates heat). The heat a drum can take without damage depends on how hard and how long the brakes are used. Too much heat can make the brakes stop working.
S-cam Brakes. When you push the brake pedal, air is let into each brake chamber. Air pressure pushes the rod out, moving the slack adjuster, thus twisting the brake camshaft. This turns the S-cam (so-called because it is shaped like the letter “S”). The S-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. 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.
Wedge Brakes. In this type of brake, the brake chamber push rod pushes a wedge directly between the ends of two brake shoes. This shoves them apart and against the inside of the brake drum. Wedge brakes may have a single brake chamber or two brake chambers, pushing wedges in at both ends of the brake shoes. Wedge-type brakes may be self-adjusting or may require manual adjustment.
Disc Brakes. In air-operated disc brakes, air pressure acts on a brake chamber and slack adjuster, like S-cam brakes. But instead of the S-cam, a “power screw” is used. The pressure of the brake chamber on the slack adjuster turns the power screw. The power screw clamps the disc or rotor between the brake lining pads of a caliper, similar to a large C-Clamp.
Wedge brakes and disc brakes are less common than S-cam brakes.
Foundation brakes are used at each wheel. What is the most common type of foundation brake?
Describe the basics of drum brakes:
Brake Drums, Shoes and Linings. Brake drums are located on each end of the vehicle's axles. The wheels are bolted to the drums. The braking mechanism is inside the drum. To stop, the brake shoes and linings are pushed against the inside of the drum. This causes friction, which slows the vehicle (and creates heat). The heat a drum can take without damage depends on how hard and how long the brakes are used. Too much heat can make the brakes stop working.
Where are brake drums located?
Which statement is correct about wedge brakes?
Wedge Brakes. In this type of brake, the brake chamber push rod pushes a wedge directly between the ends of two brake shoes. This shoves them apart and against the inside of the brake drum. Wedge brakes may have a single brake chamber or two brake chambers, pushing wedges in at both ends of the brake shoes. Wedge-type brakes may be self-adjusting or may require manual adjustment.
Which statement is correct about the S-cam function in an air brake system?
S-cam Brakes. When you push the brake pedal, air is let into each brake chamber. Air pressure pushes the rod out, moving the slack adjuster, thus twisting the brake camshaft. This turns the S-cam (so-called because it is shaped like the letter “S”). The S-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. 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.
Which statement is correct about disc brakes?
Disc Brakes. In air-operated disc brakes, air pressure acts on a brake chamber and slack adjuster, like S-cam brakes. But instead of the S-cam, a “power screw” is used. The pressure of the brake chamber on the slack adjuster turns the power screw. The power screw clamps the disc or rotor between the brake lining pads of a caliper, similar to a large C-Clamp.
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