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this show's the oil escape hole's in a front drum, so the plates won't hydraulic.




Interesting mod... an old TF guru (Marv Booth) told me he felt that was counter productive. Marv was around a long time before the current 727 experts. He felt the oil slinging off thru those holes causes a problem applying the front band, because the oil film has to be displaced first (hydraulic'd).




Because of the small fixed clearance between the drum and the band, only so much fluid can become trapped there and the amount will be much the same whether or not the drum is drilled.

Normal windage will keep a certain amount of fluid between the band and the drum but, when the drum is drilled, the centrifugal force will cause the fluid to move under pressure rather than just ride along the drum surface.


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