Ontario DZ Exterior Inspection Practice Exam 2025 – The Complete All-in-One Guide for Exam Success!

The requirement for air pressure before testing pushrod stroke is that it must be greater than 90 psi. This specific pressure ensures that the system operates effectively and is within the optimal range needed for precise measurements and testing. Pushrod stroke measurement is critical for determining whether the components are functioning as intended, and insufficient air pressure can lead to inaccurate results or inadequate engagement of the pushrod mechanisms. Maintaining air pressure above 90 psi helps to ensure the reliability and accuracy of the testing process, leading to safer and more efficient vehicle operation.

Other options suggest either too low or too high pressure, which can compromise the integrity of the testing process. For example, specifying a pressure below 80 psi would likely hinder the operation, while pressures over 100 psi or exactly 95 psi could either lead to risks of damage to components or not meeting the established testing criteria effectively.