CDL Air Brakes TestDual Air Brake SystemsMedium
A technician is inspecting a dual air brake system and finds that the primary air tank is connected to the rear service brakes and the secondary air tank is connected to the front service brakes. This configuration is an example of:
- AA faulty or incorrectly plumbed system.
- BA single-system air brake design.
- CSeparate air tanks and separate lines.
- DA combination vehicle air brake setup.
Show answer & explanationAnswer & explanation
Correct answer: C. Separate air tanks and separate lines.
This description directly outlines the characteristics of a dual air brake system having 'separate air tanks' (primary and secondary) and 'separate lines' (each tank feeding distinct brake chambers - front vs. rear). This is a standard, correct configuration for dual systems.
Why the other options are wrong
- A. This is a common and correct plumbing configuration for a dual air brake system, not faulty.
- B. A single-system would only have one main air supply for all brakes.
- D. While this vehicle might be a combination vehicle, the description specifically refers to the internal setup of the dual air brake system itself, not the combination aspect.
Standard Dual System Configuration
A typical dual air brake system features separate primary and secondary air tanks that supply air through separate lines to different sets of brake chambers, often splitting between front and rear axles.
- Primary/Secondary tanks
- Distinct air lines
- Often front/rear split
Memory trick: Separate tanks and separate lines mean a 'split' system for safety.