If your sink leaks specifically when you drain a full basin of water, the issue is typically caused by a compromised slip-joint connection on the P-trap or a failing rubber gasket beneath the sink strainer basket. Place a bucket under the plumbing, and hand-tighten all slip-joint nuts on the tailpiece and U-bend trap. If the leak originates at the top drain flange, unbolt the strainer, remove old degraded putty, and apply fresh plumber's putty or silicone caulk. Verification: Fill and drain the sink basin while inspecting all joints with a dry paper towel to confirm zero leaks.
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