January 21, 2013
The B2 brake in U151E/F and U250E transmissions is applied in reverse and manual low. During manual low, the B2 apply control plunger valve helps to correctly position the apply control valve to route low/1st oil pressure through the control valve to apply the brake. If there is excessive wear at the plunger valve sleeve, B2 brake oil is reduced.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
Either a Wet Air Test or a Vacuum Test in the location shown, result in leakage. Vacuum test must hold a minimum of 18.