Final answer:
The correct option is b) 2". The maximum allowable pushrod travel for a STANDARD type 30 brake chamber is 2 inches, essential for brake efficiency and safety in commercial vehicles.
Step-by-step explanation:
The maximum allowable pushrod travel when adjusting brakes with a STANDARD type 30 brake chamber is 2 inches. This specification is vital for ensuring the proper function of a vehicle's air brake system. The adjustment of the brake chamber is critical to maintain braking efficiency and safety. Exceeding the maximum pushrod travel can result in reduced braking performance or even brake failure, highlighting the importance of adhering to specifications when maintaining commercial vehicles.
The maximum allowable pushrod travel when adjusting brakes with a STANDARD type 30 brake chamber is 2". This means that the pushrod should not extend more than 2 inches during the adjustment process.