Why is it important to test the trailer brakes individually when inspecting a doubles or triples combination?
a.To check fuel consumption
b.To ensure each trailer unit has working brakes and can stop independently if needed
c.To verify the speedometer is accurate
d.To warm up the engine
Explanation
Testing each trailer brake individually during inspection ensures that every unit in the combination has properly functioning brakes. A trailer with failed brakes adds weight without stopping power, greatly increasing stopping distance and accident risk.