CDL - Combination Vehicle Practice Test
Truck and Trailer Operations
1. **Stopping Distance:** - A fully loaded tractor requires the shortest stopping distance.
2. **Air Leakage Rate:** - The air leakage rate for a combination vehicle with the engine off and brakes on should not exceed
**4 ...
CDL - Combination Vehicle Practice Test
Truck and Trailer Operations
1. **Stopping Distance:**
- A fully loaded tractor requires the shortest stopping distance.
2. **Air Leakage Rate:**
- The air leakage rate for a combination vehicle with the engine off and brakes on should not exceed
**4 psi per minute**.
3. **Importance of Final Air Check:**
- Failing to conduct a final air brake check can lead to losing your brakes while driving.
4. **Kingpin Lock:**
- The locking jaws of the fifth wheel should close around the **shank** of the kingpin.
5. **Glad Hands Connection:**
- Glad hands are used to connect **service and emergency air lines** from the truck to the trailer.
6. **Rollover Risks:**
- Trucks are **ten times** more likely to roll over in a crash when fully loaded compared to empty
rigs.
7. **Center of Gravity:**
- A higher center of gravity makes the truck **easier to turn over**.
8. **Trailer Brake Activation on Breakaway:**
- If a trailer breaks away, expect the **tractor protection valve to close**.
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