Symptoms:

  • 2-3 Bind-up
  • 4-3 Bind-up
  • B1 Clutches burned
  • Harsh 1 through 4 maneuver shifts
  • Erratic shift timing

Cause:

Wear of the B1 control valve in the aluminum sleeve.

Correction:

Sonnax B1 apply control plunger kit restores B1 control for up/down shifts.

U151E, U151F, U250E

B1 Apply Control Plunger Kit
Part No. 27741-04K

You need this if... View Instructions Find a Distributor

The B1 brake in Toyota/Lexus U151E, U151F and U250E transmissions is applied in 2nd, 4th and 5th Gear. If there is excessive wear at the plunger valve sleeve, B1 brake oil is reduced. Sonnax B1 apply control plunger kit 27741-04K features annular grooves on hardcoat annodized aluminum valve to correctly position the apply control valve to allow apply oil through the control valve and to feed the B1 brake.

  • Plunger sleeve made of wear-resistant aluminum
  • Hardcoat anodized aluminum plunger valve, with annular grooves, combats premature wear
  • Plunger Valve
  • Sleeve

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.

Toyota/Lexus U151E/F, U250E Valve Body Layout

Toyota/Lexus U151E/F, U250E Valve Body Layout
  • U151E, U151F, U250E B1 Apply Control Plunger Kit 27741-04K
  • U151E, U151F, U250E B1 Apply Control Plunger Kit 27741-04K

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

U151E, U151F, U250E B1 Apply Control Plunger Kit Vacuum Test Locations