Air Brake Practice Test 2026 - Free Air Brake Knowledge Practice Questions and Study Guide

Question: 1 / 400

A combination vehicle air brake system can not spill more than ____ psi per minute with the engine shut off and brakes released.

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The correct answer reflects the industry standard for acceptable air loss in a combination vehicle air brake system when the engine is off and the brakes are released. Specifically, a combination vehicle should not lose more than 3 psi in a minute under these conditions.

This standard is essential for ensuring safety in operation. If the air brake system were to lose pressure at a rate greater than 3 psi per minute, this could indicate a leak or malfunction within the system, which could compromise braking effectiveness and pose serious risks while driving. Regularly checking this pressure loss during pre-trip inspections is a crucial part of maintaining vehicle safety and compliance with regulations set forth for commercial vehicles.

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