New Jersey Air Brakes Practice Test 2025 – The All-in-One Guide to Master Your Exam Success!

The correct answer is a one-way check valve, which plays a crucial role in maintaining air pressure within the air brake system. The function of a one-way check valve is to allow air to flow in only one direction. In the context of an air brake system, if the air compressor were to develop a leak, the one-way check valve would prevent the air that is already in the storage tanks from escaping back out through the compressor.

By allowing air to enter the tanks when the compressor is functioning properly, but blocking any reverse flow in the event of a leak, the check valve helps to ensure that there is adequate air pressure available for braking. This is especially important for safety, as keeping the air pressure stable in the system ensures that the brakes will function effectively when needed.

The other mechanisms mentioned do not serve this specific purpose in the event of a compressor leak. A pressure release valve is designed to release excess pressure to prevent damage to the system, a brake booster is used to increase braking force by using air pressure, and a manual shut-off valve would require manual operation to close off air flow, which does not provide automatic protection against leaks.