Final answer:
In automotive engineering, the maximum brake drum out-of-roundness and taper allowed before machining or drum replacement is required can vary depending on the specific vehicle manufacturer and model. Most manufacturers recommend a maximum out-of-roundness of 0.015 inches (0.38 mm) and a maximum taper of 0.030 inches (0.76 mm) per 6 inches (152 mm) of drum diameter. These limits ensure proper brake performance and minimize the risk of braking issues.
Step-by-step explanation:
In automotive engineering, the maximum brake drum out-of-roundness and taper allowed before machining or drum replacement is required can vary depending on the specific vehicle manufacturer and model. However, as a general guideline, most manufacturers recommend a maximum out-of-roundness of 0.015 inches (0.38 mm) and a maximum taper of 0.030 inches (0.76 mm) per 6 inches (152 mm) of drum diameter.
This means that if a brake drum has an out-of-roundness or taper measurement exceeding these limits, it should be machined or replaced to ensure proper brake performance and minimize the risk of braking issues such as brake pedal pulsation or uneven braking.
It's important to note that these maximum limits are general recommendations and specific vehicle manufacturer guidelines should always be followed to ensure proper maintenance and safety.