You're correct. The valve bodies that do not have low band apply must not have a trans brake. So that would indicate that all trans brake valve bodies that utilize the front clutch to activate the trans brake are also low band apply units. I never realized this until you mentioned the two clutches applied. Thanks

As for the brake applying the front clutch and the rear band, are you sure of this or does the brake simply apply the front clutch and the band is applied through the manual valve movement? I guess an easy way to check would be to have the trans in neutral and push the brake button. If the car backs up, then it would indicate that the brake applies both but if is does nothing, then it would only be applying the front clutch, correct?