sonnax-black Facebook-color LinkedIn-color maillink printlink r_and_r_only SERVOFIX-logo-web Twitter-color VBFIX-logo-web video-logo-web warranty_only Youtube-color


  • Shift concerns
  • UD/B3 brake clutches burned


The B3 orifice control valve often sticks in the casting bore, preventing proper stroking of the valve and flow control to the UD/B3 brake.


Refurbish the valve bore and install the Sonnax oversized B3 orifice control valve and spring to prevent future sticking issues.

U151E, U151F, U250E

Oversized B3 Orifice Control Valve Kit
Part No. 27741-16K

You need this if... View Instructions

In U151E/F, U250E units, the B3 orifice control valve and spring are biased by SLT solenoid (torque signal) pressure to control the UD/B3 brake. Regulated line pressure is routed from the 4-5 shift valve through the B3 orifice control valve to apply the UD/B3 brake. When this valve sticks, flow will diminish or no flow will go to the brake, resulting in burnt clutches or shift complaints.

  • Hard-coat anodized aluminum valve maintains consistent bore-to-valve clearance at temperature variations, which helps prevent seizing of the valve
  • Valve front spool has been greatly lengthened to provide more stability in the bore
  • Annular grooves provide better valve centering in the bore and keep the contact area lubricated to prevent seizure
  • Valve
  • Spring

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 U151E/F, U250E Valve Body Layout

Toyota u151ef  u250e

January 21, 2013

Toyota U151E/F, U250E Vacuum Test Guide

Topics: Vacuum Testing Vacuum Test Guides Transmission Toyota/Lexus U250E Transmission U151F Transmission U151E Transmission

Read Now

September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

Gregg Nader

Topics: Diagnostics And Theory Transmission

Read Now
  • 27741 16k combo
  • 27741 16k

You need this if...

The OE valve is stuck in the bore.