How do you test your air brakes?

To test air brakes effectively, the correct approach is to pump the brakes three times and hold the brake on the fourth pump. This method allows you to assess the air pressure in the braking system. When you pump the brakes, you’re building up pressure, and the fourth pump allows you to check for any significant drop in pressure over a short duration, indicating whether the air brakes are functioning properly.

This procedure helps in ensuring that there are no leaks and that the brakes will respond effectively while driving. It is essential for a safe driving experience, especially in vehicles equipped with air brakes. Properly functioning air brakes contribute to a vehicle's stopping power, which is crucial for safe operation. Each of the other testing methods listed does not provide as effective of a test for checking air brake performance and could potentially miss critical issues.