Wear of the B1 control valve in the aluminum sleeve.
The new assembly restores B1 control for up/down shifts.
The B1 brake in U151E/F and U250E transmissions is applied in 2nd, 4th and 5th gear. The B1 apply control plunger valve helps to correctly position the apply control valve to allow apply oil through the control valve and to feed the B1 brake. If there is excessive wear at the plunger valve sleeve, B1 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.
January 21, 2013
Topics: Vacuum Testing Vacuum Test Guides Transmission Toyota/Lexus U250E Transmission U151F Transmission U151E TransmissionRead Now
Contact a Sonnax Parts Distributor.
Either a Wet Air Test or a Vacuum Test in the location shown, result in leakage. Vacuum test must hold a minimum of 18.