Not Ranked
The proximity of the tubes doesn't concern me for two reasons:
1/ Heat will tend to rise from the pipes, so only radiant heat is a factor, mitigated by airflow. Note that the plastic-coated metal clamp still looks OK.
2/ Hot fluid doesn't flow into the master cylinder except under rare conditions. Namely, only after a major system leak has already occurred. Otherwise the hot fluid stays over a foot away.
Don't Worry. Be Happy!
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