CDL Combination Vehicles TestCombination Vehicle Air BrakesMedium
During a pre-trip inspection of a combination vehicle, you notice that one of the air tanks is actively leaking air, and the air compressor is constantly running. What is the most appropriate immediate action?
- AIncrease the engine RPMs to help the compressor keep up with the leak.
- BAttempt to patch the leak temporarily and then continue the trip.
- CContinue the trip, but monitor the air pressure gauges closely.
- DImmediately take the vehicle out of service and arrange for repairs.
Show answer & explanationAnswer & explanation
Correct answer: D. Immediately take the vehicle out of service and arrange for repairs.
A constant air leak with the compressor running continuously indicates a severe problem that can lead to brake failure. The vehicle must be taken out of service immediately.
Why the other options are wrong
- A. Increasing RPMs will put more strain on the compressor and engine but will not fix the leak or make the vehicle safe.
- B. Temporary patches are not reliable for air brake systems and do not address the underlying safety issue.
- C. Continuing the trip with a significant air leak is extremely dangerous and could lead to complete brake failure.
Critical Air Leak Action
If a significant air leak is detected in a combination vehicle's air brake system, rendering the braking system unsafe, the vehicle must be immediately taken out of service.
- Constant compressor running signals a major leak.
- Loss of air pressure leads to brake failure.
- Safety is paramount; do not operate unsafe vehicles.
Memory trick: Leak + Constant Compressor = Stop, Repair, No More.