Why should chocks be used when parking a trailer that does not have spring brakes?

• A. To prevent the trailer from tilting
• B. To hold the trailer in place if the air leaks out
• C. To enhance the traction of the wheels
• D. To make parking easier

Answer: (B)

Chocks should be used when parking a trailer that does not have spring brakes primarily to hold the trailer in place if the air leaks out. In vehicles equipped with air brakes, the spring brakes need air pressure to disengage. If the air pressure drops significantly due to a leak, the trailer could roll away if it is not properly secured. By placing wheel chocks behind the wheels of the trailer, you create a physical barrier that prevents it from moving unintentionally, thus providing a critical safety measure to ensure that the trailer remains stationary.

Using chocks becomes even more crucial when dealing with trailers lacking automatic braking systems linked to the air pressure, as they may not have the means to engage a secure parking brake under such conditions. Therefore, the inclusion of chocks is a standard safety practice for securing trailers effectively.