In a Type 30 brake chamber, what is the maximum allowable push rod movement?

Answer: B — 64 mm

In a Type 30 brake chamber, the maximum allowable push rod movement is indeed 64 mm. This measurement is important because it directly relates to the functionality and effectiveness of the air brake system. When the push rod moves within this specified limit, it ensures that the air brake system is functioning correctly, providing adequate braking force while preventing any potential issues such as premature wear or malfunction. Understanding this specification helps ensure that the brake chamber and the associated components are maintained within safe operational limits. If the movement exceeds the allowable maximum, it could indicate a problem with the brake system that may require inspection or maintenance to ensure safe vehicle operation. This limit is part of the standard testing and maintenance protocols for air brake systems and is critical for safety compliance on the road.