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Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away

A The trailer will not have brakes
Explaination
Older trailers do not have spring brakes. This means that if the air supply in an older trailer's air tank has leaked away, there will be no working brakes connected to the trailer and its wheels will turn freely.
B The trailer will stop normally
C The trailer will speed up