When the sustaining pedal squeaks, look first to the pedal, then to the wooden rods leading up to the damper rod.
Remember too that the term "loud pedal" as applied to the sustaining pedal, as it properly is called, is incorrect.
There is a third pedal called the sustaining pedal, but I do not think it has proved as valuable an invention as was anticipated.
To carry out his designs the third or sustaining pedal became necessary.
Don't use the sustaining pedal too frequently, not even as frequently as indicated on the rolls.
Have you ever tried singing a note into this instrument when the sustaining pedal is depressed?