Why are small blisters in a rubber brake hose considered acceptable?

Small blisters in a rubber brake hose can be considered acceptable as long as they are not leaking. This is due to the fact that minor imperfections, such as blisters, might not compromise the structural integrity of the hose or its ability to contain brake fluid effectively. In a brake system, the primary concern is ensuring that there are no leaks that could lead to a loss of hydraulic pressure, which would impair braking performance and safety.

As long as the hose maintains its function without leaking and shows no signs of deterioration or weakening that could lead to a failure, then small blisters may not warrant immediate replacement. However, it's important to monitor the condition of the brake hoses, as any change in their state could indicate potential issues that might require further attention.

This perspective embraces a focus on functionality and safety while recognizing that not every cosmetic or minor physical imperfection in brake components necessarily indicates that a replacement is needed.